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Engine idles rough in gear aaand got code b1318 indicating low battery voltage at module. it doesn't say which module. any tips

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  • Cars & Trucks Master
  • 1,511 Answers

There could be an energy leak, like a bad wire, insulation frayed, or battery connections are coated. Check and clean the poles and wires. If Old they may be dry and cracking.

Posted on May 10, 2014

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

tepfy
  • 319 Answers

SOURCE: engine rough in low idle

I would start by replacing your automatic air intake and throtle body sensor. Check these 2 things out and let me know.

tepfy

Posted on Feb 27, 2009

  • 22 Answers

SOURCE: 2001 Forester, Rough idle and engine loping driving at low rpm

I had a similar problem on my 2002 Impreza RS 2.5 (same engine and engine control system). In my case it was the O2 sensor on the intake manifold. This happened at 34,xxx mi. so it was covered by the warranty. Replacing the part is very easy. (two bolts and a wiring harness). Obviously I would start simple and cheap and work your way to expensive and difficult.
From my understanding its all caused from the engine missfiring. If its been a while or never, I'd change the spark plugs first. (stick with the Subaru Parts plugs, I went after market and the dealer claimed the plugs were not the correct "temperature" and had to pay for the new plugs and install although they did it without my permition. Thats a whole nother story).
Could also be the manifold pressure sensor.
Either 02 or manifold pressure sensor may cause intermitent check engine light.
Where I live Brookline,MA , Autozone will run a free diagnostic on your car by hooking up to your ECU and will give you the trouble codes and possible remidies. Of course there are no guarentee's but it will point you in the right direction.
Good Luck

Posted on Jun 18, 2009

  • 583 Answers

SOURCE: Rough low idle in gear when stopped at a light.

probable vacuum leak query brake booster

Posted on Jul 26, 2009

  • 1986 Answers

SOURCE: 1999 olds alero 2.4 idles rough and stalls when

When did you last change the spark plugs, distributor cap, ignition wires, ignition coil, fuel filter, or the fuel pump? Any one of these could causing your care to stall. Also, have you been using regular gas or premium as premium gas can cause your engine to not combust properly if it wasn't designed for premium

Posted on Aug 07, 2009

  • 1915 Answers

SOURCE: Missing, running very rough at

the P0011 and P0022 are the camshaft sensors (both sides) are over advanced--common problem on Fords, and is usually a defective VCT solenoid (variable cam timing solenoid)-it will cause your other codes (P0300 random misfire), P0305 (#5 cylinder), P0307 (#7), P0316 (misfire at startup)-P0171 is a lean condition on side 1, where #1 plug is located (look for a vacuum leak, but a faulty VCT could also cause this)-is there any chance the last oil change set this off? The proper viscosity is very important and may have caused these codes.

The P2198 is O2 sensor signal stuck rich bank 2 sensor 1. Has the engine or sensors recently gotten a bath in oil (seafoam?)-this code indicates something of possibly an over zealous maintenance procedure could have damaged maybe the MAP sensor, or more.... Unfortunately, you have a lot of company. At least you didn't crack a piston or hydrolock the engine. Seafoam is pale oil, naptha, and alcohol. With more detail there should be a reason for all those somewhat related codes-post more information.

Posted on Jan 27, 2011

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Our 2007 Ford Freestyle 3.0V6 shows B1318 code, also scanner shows low battery voltage module. Car shuts off.Please help what to do to fix?


Which module ?

B1318 Battery Voltage Low Audio Control Module REFER to Section 414-00 . B1318 Battery Voltage Low DSM REFER to Section 414-00 . B1318 Battery Voltage Low DVD Player REFER to Section 414-00 . B1318 Battery Voltage Low Instrument Cluster REFER to Section 414-00 . B1318 Battery Voltage Low RCM REFER to Section 414-00 . B1318 Battery Voltage Low Satellite Radio Receiver REFER to Section 414-00 . B1318 Battery Voltage Low SJB REFER to Section 414-00 .
According to this charging system isn't working correctly ! This is a computer controlled charging system .
Principles of Operation
The powertrain control module (PCM) controlled charging system determines the optimal voltage setpoint for the charging system and communicates this information to the voltage regulator. This system is unique in that it has 2 unidirectional communication lines between the PCM and the generator/regulator. Both of these communication lines are pulse-width modulated (PWM). The generator communication (GEN COM) line communicates the desired setpoint from the PCM to the voltage regulator. The generator monitor (GEN MON) line communicates the generator load and error conditions to the PCM. The third pin on the voltage regulator, the A circuit pin, is a dedicated battery voltage sense line.
The charging system voltage is controlled by the PCM. The generator charges the battery and at the same time supplies power for all of the electrical loads that are required. The battery is more effectively charged with a higher voltage when the battery is cold and a lower voltage when the battery is warm. The PCM is able to adjust the charging voltage according to the battery temperature by using a signal from the intake air temperature (IAT) sensor. This means the voltage setpoint is calculated by the PCM and communicated to the regulator by a communication link.
The PCM simultaneously controls and monitors the output of the generator. When the current consumption is high or the battery is discharged (the PCM recognizes this and increases the output of the generator to accommodate), the system is also able to increase the idle speed to increase the charge.
To minimize the engine drag when starting the engine, the PCM does not allow the generator to produce any output until the engine has started. The PCM then progressively increases the output of the generator.
The PCM turns the charging system warning indicator off after the engine is started and illuminates it under fault conditions (when the generator is not generating the correct amount of current with the engine running). The charging system warning indicator is also illuminated by the PCM whenever the key is ON with the engine OFF.
This is a System 4 charging system, which uses the GEN MON and GEN COM lines to control and monitor the charging system through the PCM. System 4 charging systems are virtually identical in design and therefore, share the same diagnostics. The circuit numbers and colors may be different, but the functions are the same.

Jun 30, 2017 | Ford Cars & Trucks

2 Answers

I have a 2004 F150 airbag flashing 1 3 so a code 13 can not find any shorts to ground


Possible airbag computer when an airbag is deployed you must replace airbag module with airbag and seatbelt if locked.

Aug 17, 2016 | Cars & Trucks

1 Answer

How to fix b1318 code on a how to fix b1318 code on a 2004 taurus


b1318 battery voltage low. Have the battery checked for free at a parts store you probably need a new one.

Sep 14, 2015 | Cars & Trucks

1 Answer

Code b1318 2001 ford ranger edge 3.0. What would cause this code


my book says b1318 code is "low battery voltage at module" this is a self test the engine control computer (ECC) does to measure the power comming to it that runs it. it means voltage at module has been less than 11 volts , try unhooking battery cable for like an hour , also good time to clean your battery terminals (BOTH OF THEM) reconncet battery OBSERVE polarity Very important (red to+) this should reset fault rescan after driving a few miles if code persists then you;ll have to look farther for a bad /dirty power connection around battery and assoc items

Sep 15, 2014 | Cars & Trucks

1 Answer

Can you tell me the location of code reader 1991 capri ?


1991 is pre-OBD2. code readers will not work.
sorry.
however, all is not lost. Many cars have an alternate way of reading codes from the computer.
Toyota has a block under the hood and you short couple wires together and count engine light flashes
Chrysler you can turn the ignition key on and off a few times and count engine light flashes
in your case for GMs from 1982 to 1995
1: find the 12 pin connector under the dash and short the upper two rightmost terminals.
with the ignition "ON" and engine not running. The system will enter the diagnostic mode. In this mode, the computer will display a Code 12, three consecutive times, by flashing the "CHECK ENGINE", "SERVICE ENGINE SOON" or "MALFUNCTION INDICATOR LAMP" or light. A Code 12 consists of one flash, a short pause, then two flashes in rapid succession.
2:. After Code 12 is displayed, any stored trouble codes will be displayed by flashing the "CHECK ENGINE", "SERVICE ENGINE SOON" or "MALFUNCTION INDICATOR LAMP" light. All codes are displayed 3 times each then a code 12 will repeat. In the diagnostic mode, the computer will also energize all computer controlled relays and solenoids.

Tech -- GM 2 Digit codes for 82 and up (non OBD-II)
code - code definition
12- diagnostic mode
13- 02 sensor or circuit
14- coolant sensor or circuit/ high temp indicated
15- coolant sensor or circuit/ low temp indicated
16- system voltage out of range
19- crankshaft position sensor or circuit
21- throttle position sensor or circuit- voltage high
22- throttle position sensor or circuit- voltage low
23- mixture control (m/c) solenoid or circuit (carbureted models)
23- manifold air temperature (mat) sensor or circuit (1990 and earlier models)
23- intake air temperature (iat) sensor circuit (fuel-injected models)
24- vehicle speed sensor (vss) or circuit
25- manifold air temperature (mat) sensor or circuit - high temperature indicated (1990 and earlier models)
25- intake air temperature (iat) sensor or circuit - high temperature indicated (1991 and later models)
26- quad driver module circuit
27- quad driver module circuit
28- quad driver module circuit
29- quad driver module circuit
31- park/neutral position (pnp) switch circuit
32- baro sensor or circuit (carbureted models)
32- egr circuit (fuel-injected models)
33- manifold absolute pressure (map sensor signal voltage high
33- mass air flow (maf) sensor or circuit - excessive airflow indicated
34- manifold absolute pressure (map) sensor signal voltage low 34- mass air flow (maf) sensor signal - low airflow indicated
35- idle speed control (isc) switch or circuit (shorted) (carbureted models)
35- idle air control (iac) valve/ circuit
38- brake switch circuit
39- torque converter clutch (tcc) circuit
41- no distributor signals to ecm, or faulty ignition module ( carbed models)
41- cylinders select error- mem-cal or ecm problem ( fuel-injected models
41- cam sensor circuit (3.8 engine)
42- bypass or electronic spark timing (est) circuit
43- low voltage at ecm terminal l (carbureted models)
43- knock sensor circuit
44- oxygen sensor or circuit - lean exhaust detected
45- oxygen sensor or circuit - rich exhaust detected
46- power steering pressure switch circuit
48- misfire diagnosis
51- prom, mem-cal or ecm problem
52- calpak or ecm problem
53- egr fault (carbureted models only)
53- system over-voltage (ecm over 17.7 volts)
54- mixture control (m/c) solenoid or circuit (carbureted models)
54- fuel pump circuit (1986 and later models)
55- oxygen sensor circuit or ecm
55- fuel lean monitor (2.2l engine)
61- oxygen sensor signal faulty (possible contaminated sensor)
62- transaxle gear switch signal circuits
63- manifold absolute pressure (map) sensor voltage high (low vacuum detected)
64- manifold absolute pressure (map) sensor voltage low (high vacuum detected)
66- pressure sensor or circuit air conditioning

May 20, 2014 | 2002 Subaru Forester

1 Answer

1995 dodge ram 1500 318 motor it wont get fire where is the logic module located


Under hood,passenger side mounted on the firewall,but ...
Could be something else ,crank sensor or cam,or ign.rotor ect.
The module like 3 hundred bucks.Try this ,turn the key
on-off-on-off-on( without out hitting the starter) the check
engine light should begin to flash.
Here is a code list,may narrow down the problem.
Diagnostic Trouble Code Descriptions and service hints. Fault Code DRB Display Code Description. Service hints. 11 No Crank reference signal at PCM No Distributor reference signal detected during engine cranking. Check the circuit between the distributor and PCM. 12 Battery Disconnect Direct Battery input to PCM disconnected within last 50 ignition key-on cycles. Normal if battery has been disconnected, otherwise check battery power and ground connections. 13** No change in MAP from start to run No difference seen between the engine MAP reading and the barometric (atmospheric) pressure reading at startup. Indicates a problem with the MAP sensor vacuum system. 14** MAP sensor voltage too low or too high MAP sensor voltage output is outside the acceptable range. 15** No Vehicle speed sensor signal No signal received from the vehicle speed sensor during road load operation. 17* Engine is cold too long Engine temperature too high or too low while traveling. Check coolant level, radiator cap, temperature sensor, and thermostat. 21** O2S Stays at center O2S shorted to voltage O2 sensor does not detect rich or lean condition, or O2 sensor input voltage too high. DRB will indicate which side with dual sensors. The O2 sensor signal should fluctuate under normal conditions. 22** ECT sensor voltage too high or too low Engine Coolant temperature sensor input out of normal range. Check engine temperature sensor. 23** Intake air temp sensor voltage too high or low Intake air manifold temperature sensor is out of range. Check sensor. 24** Throttle position sensor voltage too high or low TPS sensor is out of normal range. 25** Idle air control motor circuits A short is detected in one or more of the idle air motor circuits. 27* Injector # control circuit Injector number # output driver circuit does not respond to the control signal. Check the affected circuit. 31** EVAP Solenoid Circuit Short or open in the EVAP solenoid circuit. Check for loose, broken, or shorted wire in the charcoal canister purge solenoid wiring and connectors. 32** EGR Solenoid circuit Short or open in the EGR solenoid circuit. Check for loose, broken, or shorted wire in the EGR valve wiring and connectors. Possible air fuel ratio imbalance not detected during diagnosis. 33* AC clutch relay circuit Short or open in the AC clutch circuit. 34* Speed control circuit or speed control switch always low or high An open or short in the speed control vacuum or vent circuits. Speed control switch input above or below normal range. 35 Radiator Fan low speed relay circuit Open or short in the radiator fan relay wiring. 37** Torque converter clutch solenoid CKT or Trans temp sensor too high or low Open or short in CKT wiring or connectors. Voltage out of range at transmission temperature sensor input. See NOTE #1 below 41** Generator field not switching properly Open or short in the generator (alternator) field control (regulator) circuit. This indicates a problem with the charging circuit and the fault is set when the battery voltage from the ASD relay falls below 11.75 volts. Wiring, connectors, fuses, and the ASD relay should be checked. A shorted battery cell can also trigger this fault. 42* Auto shutdown relay circuit Open or short in the ASD relay wiring or connectors. 43** Ignition coil circuit # Open or short in number # coil circuit. Indicates that the ignition coil's peak primary circuit current is not achieved with the maximum dwell time. 44* Battery temp sensor volts out of range An open or short in the engine coolant temperature sensor circuit or a problem in the PCM's battery temperature circuit. 45* Trans OD solenoid circuit Transmission OD solenoid circuit failure. Open or short in the transmission overdrive solenoid circuit. 46** Charging system voltage too high Battery voltage sense input above target charging voltage during engine operation. Computer is indicating that the battery voltage is not being regulated. 47** Charging system voltage too low Battery voltage sense input above target charging voltage during engine operation. Also, no significant change in battery voltage was detected during a test of the generator output. 51** System lean L-Idle Adap at rich limit or lean R-Idle Adap at rich limit O2 sensor signal indicates lean air/fuel ratio during engine operation. The computer ran the mixture to the rich limit of programming, but the O2 sensor still indicated a lean condition. L or R indicate left or right side O2 sensor. Fuel pressure problems can lean the mixture and set this fault. 52** System rich L-Idle Adap at lean limit or rich R-Idle Adap at lean limit O2 sensor signal indicates rich air/fuel ratio during engine operation. The computer ran the mixture to the lean limit of programming, but the O2 sensor still indicated a rich condition. L or R indicate left or right side O2 sensor. Faulty ignition components, high or low fuel pressure, or leaking injectors can set this fault. 53* Internal PCM failure or PCM SPI comm failure An internal PCM failure or PCM communications failure has been detected. 54* No cam sync signal at PCM No fuel sync (camshaft signal) detected during engine crank. No camshaft position sensor signal was received from the distributor. Problem with the distributor synchronization circuit. 55 N/A End of message code. A DTC 55 is used to end all DTC messages. This code does not show on the DRB tool and indicates a completion of the stored codes on the Malfunction Indicator Lamp (check engine lamp). 62* PCM failure SRI miles not stored Unsuccessful attempt to update Service Reminder Indicator miles in the PCM EEPROM (memory). 63* PCM Failure EEPROM write denied Unsuccessful attempt to write and EEPROM location by the PCM. Controller failure, check the PCM. This code can be set when attempting an unauthorized reprogram of the PCM. 71** Aux 5V signal voltage low The auxiliary 5 volt supply output voltage is low. The 5 volt output signal is not reaching the required voltage level. 72** Catalytic Converter efficiency failure The catalytic converter is not converting emissions in the proper ratio.

Feb 22, 2013 | Cars & Trucks

1 Answer

Need trouble code list


Older Model Computer Codes (OBDI) - IMPORTANT! Codes may be different for newer vehicles starting circa 1996.
11 No ignition reference signal detected during cranking OR timing belt skipped one or more teeth; OR loss of either camshaft or crankshaft position sensor.
12 Battery or computer recently disconnected
13 MAP sensor or vacuum line may not be working
14 MAP sensor voltage below .16V or over 4.96V
15 No speed/distance sensor signal
16 Loss of battery voltage detected with engine running
17 Engine stays cool too long (bad thermostat or coolant sensor?)
OR
17 (1985 turbo only): knock sensor circuit
21 Oxygen sensor signal doesn't change (stays at 4.3-4.5V). Probably bad oxygen sensor
22 Coolant sensor signal out of range - May have been disconnected to set timing
23 Incoming air temperature sensor may be bad
24 Throttle position sensor over 4.96V
25 Automatic Idle Speed (AIS) motor driver circuit shorted or target idle not reached
26 Peak injector circuit voltage has not been reached (need to check computer signals, voltage reg, injectors)
27 Injector circuit isn't switching when it's told to (TBI)
OR (MPI) injector circuit #1 not switching right
OR (turbo) injector circuit #2 not switching right
OR (all 1990-) injector output driver not responding
- check computer, connections
31 Bad evaporator purge solenoid circuit or driver
32 (1984 only) power loss/limited lamp or circuit
OR
32 EGR gases not working (1988) - check vacuum, valve
OR
32 (1990-92) computer didn't see change in air/'fuel ratio when EGR activated - check valve, vacuum lines, and EGR electrical
33 Air conditioning clutch relay circuit open or shorted (may be in the wide-open-throttle cutoff circuit or normal on early 80's models if you don't have air conditioning)
34 (1984-86) EGR solenoid circuit shorted or open
OR
34 (1987-1991) speed control shorted or open
35 Cooling fan relay circuit open or shorted
OR
35 idle switch motor fault - check connections
36 (turbo only) Wastegate control circuit open or shorted
37 Shift indicator light failure, 5-speed
OR
part throttle lock/unlock solenoid driver circuit (87-89)
OR
solenoid coil circuit (85-87 Turbo only)
OR
Trans temperature sensor voltage low (1995 and on)
41 Alternator field control circuit open or shorted
42 Automatic shutdown relay circuit open or shorted
OR
42 Fuel pump relay control circuit
OR
42 Fuel level unit - no change over miles
OR
42 Z1 voltage missing when autoshutdown circuit energized (The Z1 voltage is the voltage of the circuits fed by the autoshutdown relay. This typically includes fuel pump and switched-battery feed to the ignition coil)
43 Peak primary coil current not achieved with max dwell time
OR
43 Cylinder misfire
OR
43 Problem in power module to logic module interface
44 No FJ2 voltage present at logic board
OR
44 Logic module self-diagnostics indicate problem
OR
44 Battery temperature out of range
45 Turbo boost limit exceeded (engine was shut down by logic module)
46 Battery voltage too high during charging or charging system voltage too low
47 Battery voltage too low and alternator output too low
51 Oxygen sensor stuck at lean position (this may be tripped by a bad MAP sensor system causing a rich condition. If you get hot rough idle and stalling, especially on deceleration, accompanied by flooded engine and difficulty restarting, that can be a bad MAP sensor causing the O2 sensor to try to compensate. If you get poor cold driveability, stumbling and bucking, and acceptable warm driving with poor gas mileage (a drop of 10 mpg or more), that is usually the O2 sensor.
OR
51 Internal logic module fault ('84 turbo only).
52 Oxygen sensor stuck at rich position
OR
52 Internal logic module fault ('84 turbo only)
53 Logic module internal problem
54 No sync pickup signal during engine rotation (turbo only)
OR
54 Internal logic module fault ('84 turbo only) - or camshaft sensor/distributor timing
55 End of codes
61 "Baro" sensor open or shorted
62 EMR mileage cannot be stored in EEPROM
62 PCM failure SRI mile not stored
63 Controller cannot write to EEPROM
64 Catalytic converter efficiency failure
65 Power steering switch failure
66 No CCD Message From TCM and/or No CCD Message From BCM

Oct 06, 2012 | 1995 Jeep Grand Cherokee

1 Answer

P0206 p0113 p0123


P0113 - Intake Air Temperature Circuit High Input
The Powertrain Control Module (PCM) monitors the temperature of the air entering the engine. The PCM supplies a 5 volt reference voltage to the Intake Air Temperature (IAT) sensor. The IAT is a thermistor that varies resistance based on temperature. As the temperature increases, resistance decreases. Low temperature results in a high signal voltage. When the PCM sees a signal voltage higher than 5 volts, it sets this P0113 check engine light code.

There will likely be no symptoms other than illumination of the Malfunction Indicator Lamp (MIL - Check Engine Light / Service Engine Soon).

A code P0113 may mean that one or more of the following has happened:
Internally failed IAT sensor
Faulty connection at IAT sensor
Open in IAT ground circuit or signal circuit
Short to voltage in IAT signal circuit or reference circuit
IAT harness and/or wiring routed too close to high-voltage wiring (e.g. alternator, spark plug cables, etc.)
Faulty PCM (less likely but not impossible)


P0123 Code - Throttle Position Sensor/Switch A Circuit High Input
A P0123 code means that the the car's computer has detected that the TPS (throttle position sensor) is reporting too high a voltage. Some symptoms may include:
Rough idle
High idle
Surging
other symptoms may also be present

A code P0123 may mean that one or more of the following has happened:
TPS not mounted securely
TPS circuit short to ground or another wire
Faulty TPS
Damaged computer (PCM)


P0206 - Cylinder 6 Injector Circuit Malfunction
This means that the PCM detected a fault in the injector or the wiring to the injector. It monitors the injector and when the injector is activated, the PCM expects to see the voltage pulled "low" or close to zero. When the injector is switched off, the PCM expects to see a voltage that is close to battery voltage or "high". If it doesn't see the expected voltage the PCM will set this code. The PCM also monitors resitance in the circuit. If the resistance is excessively low or high it will set this code.

The symptoms for this code will likely be a misfire and a rough running engine. Poor acceleration. The MIL will also be illuminated.

The causes of a P0206 engine light code could be any of the following:
Bad injector. This is usually the cause of this code but doesn't rule out the possibility of one of the other causes
Open in the wiring to the injector
Short in the wiring to the injector
Bad PCM


Hope this helps and just keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa.

Nov 01, 2011 | 2004 Dodge Durango

1 Answer

Cant Find a list of codes 1989 Buick Century. Car stalls and has a rough idle. coads are 31 43 and 44


Here is a code list for you. Remember this doesn't always mena a sensor issue, the problem can be in the wiring as well, or in the case of a lean code you may have an actual lean condition due to a vacuum leak at the intake or vacuum hoses or connections. I have highlighted your fault codes and added extra notes.
GM common codes for OBD1 (for vehicles made before 1995)
12 System normal
13 oxygen sensor circuit open
14 coolant sensor high resistance or shorted
15 coolant sensor circuit low or open
16 direct ignition system (DIS) fault in circuit
17 cam position sensor fault
18 crank or cam sensor error
19 crank sensor circuit fault
21 tps sensor out of range
22 tps sensor signal voltage low
23 intake air temp sensor out of range, low
24 vehicle speed (vss) sensor circuit fault
25 air temp sensor sensor out of range, high
26 quad-driver module (computer) circuit #1 fault
27 quad-driver module (computer) 2nd gear circuit
28 quad-driver module (computer) circuit #2 fault
29 quad driver module (computer) 4th gear circuit
31 camshaft position sensor fault
32 egr circuit fault
33 map sensor signal out of range, high
34 map sensor signal out of range, low
35 idle air control sensor circuit fault
36 ignition system circuit error
38 brake input circuit fault
39 clutch input circuit fault
41 cam sensor circuit fault, igntion control circuit fault
42 electronic spark timing (EST) circuit grounded
43 knock sensor malfunction or electronic spark control (ESC) circuit fault (ignore this for now)
44 oxygen sensor lean exhaust (make sure you no engine vacuum leaks)

45 oxygen sensor rich exhaust
46 pass-key II circuit or ps.pressure switch circuit fault
47 pcm-bcm data circuit
48 misfire diagnosis
51 calibration error, mem-cal, ecm or eeprom failure
52 engine oil temperature circuit, low temperature indicated
53 battery voltage error or egr or pass-key II circuit
54 egr system failure or fuel pump circuit low voltage
55 a/d converter error or pcm not grounded or lean fuel or frounded reference voltage
56 quad-driver module #2 circuit
57 boost control problem
58 vehicle anti-theft system fuel enable circuit
61 a/c system performance or degraded oxygen sensor signal
62 engine oil temperature high temperature indicated
63 oxygen sensor right side circuit open or map sensor out of range
64 oxygen sensor right side lean exhaust indicated
65 oxygen sensor right side rich exhaust indicated
66 a/c pressure sensor circuit low pressure
67 a/c pressure sensor circuit or a/c clutch circuit failure
68 a/c compressor relay circuit failure
69 a/c clutch circuit head pressure high
70 a/c refrigerant pressure circuit high
71 a/c evaporator temperature sensor circuit low
72 gear selector switch circuit
73 a/c evaporator temperature circuit high
75 digital egr #1 solenoid error
76 digital egr #2 solenoid error
77 digital egr #3 solenoid error
79 vehicle speed sensor (vss) circuit signal high
80 vehicle speed sensor (vss) circuit signal low
81 brake input circuit fault
82 ignition control (IC) 3X signal error
85 prom error
86 analog/digital ecm error
87 eeprom error
99 power management

Jul 21, 2011 | 1989 Buick Century

1 Answer

Upon startup engine idles rough then speeds up and returns to normal idle .After a couple of minutes the volt light comes on then no power then a complete shut down.Starts back up for a while then shuts...


OK, the volt light means that the alternator is not charging the battery. It could mean the battery is shorted out, or the battery is bad or low on charge due to an alternator not charging.

Replace the Alternator and battery as indicated by standard voltage output tests under load.

The computer in the car will not operate the engine properly on low voltage.

Fixing the charging system, may resolve the rough idle (meaning that it may be trying to relearn after data was erased by low voltage of the battery), and the speed up.


Try the charging system first, and once that is repaired, reevaluate the engine driveability and speed and idle smoothness, after it relearns.

Good luck on this repair.

Nov 06, 2010 | 1999 Buick LeSabre

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