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Check engine code DTC 42 - 1995 Dodge Caravan

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95 sl500 check engine light reset and comes back on after it sits over night. any idea?


What code is it throwing ? Some codes are what are called two trip codes ! You clear the codes an start an drive the vehicle ,no check engine light . Park the vehicle over night an bam next time you start an drive the vehicle the check engine light comes back on .

??There are two types of DTC's, 1 trip DTC's and 2

trip DTC's

??A 1 trip DTC is for a condition that requires

immediate attention such as a catalyst damaging

misfire.

??A 2 Trip DTC is one that a condition must be found

during 2 consecutive trips such as an EGR fault.

??Most Monitors do not set a DTC and light the MIL

when a vehicle fails a test for the first time during a

DRIVE CYCLE. If a test is failed on a second

consecutive DRIVE CYCLE the MIL will light and a

DTC is stored in the vehicles powertrain control
module (PCM).

Feb 07, 2016 | Cars & Trucks

2 Answers

Bought car at auction- no keys. Had key made at GM dealer. Programmed key- key works. Car wont start- Codes are P0633 and P1629. cannot clear codes


DTC P0633 : Theft Deterrent Key Not Programmed

When learning the pre-release password, as well as the challenge and response sequence, the engine control module (ECM) is placed in learn mode. DTC P0633 will set automatically as an indicator that the system is in learn mode and not as a fault indicator. Once the password and challenge/response are learned, learn mode will be exited when the engine is successfully started. At this point, the DTC will be cleared. If the ECM does not exit learn mode, P0633 will remain current and indicate a fault.
The "key" referenced in the DTC descriptor does not refer to the vehicle key. In this case, "key" is referring to the challenge response.
DTC P0633 requires a successful engine start to exit the learn procedure and clear the DTC. If an unrelated malfunction exists that causes engine starting to be disabled or otherwise unavailable, learn mode will not exit and DTC P0633 will remain current. In this situation, the cause of the inoperative engine starting must be corrected before diagnosing DTC P0633.
DTC P1629: Theft Deterrent Fuel Enable Signal Not Received
The theft deterrent module (TDM) sends the pre-release password to the engine control module (ECM) via the serial data circuit. The ECM then sends a challenge to the TDM. Both the ECM and TDM perform a calculation on this challenge. If the calculated response from the TDM equals the calculation performed by the ECM, the ECM will allow vehicle starting.
DTC P1629 is an indicator that the challenge response was not received within the required 2 second window. This does not necessarily indicate a fault is present with the TDM or ECM. Factors such as a long engine crank, a delay in the serial data communication, or B-codes set in the TDM will cause DTC P1629 to set. This DTC should not be used as a fault indicator, but rather as a symptom to assist in the diagnosis of these other systems.
Who checked the codes , you -dealer ? You need to have BCM checked for codes B - codes ! you need a up scale diagnostic scan tool for that , dealer Tech -2 !
DTC B3935 57 : Transponder Authentication Error
DTC B3976 46 : Unconfigured Transponder/Vehicle Configuration Not Programmed
DTC B3060 : Unprogrammed Transponder Identification Code Received
DTC B3055: No Transponder Modulation or No Transponder
DTC B3031: Security System Controller In Learn Mode

Aug 07, 2015 | 2006 Buick Lucerne

1 Answer

2006 HHR. What are the probable causes of a recurrent DTC P0172?


DTC P0172 Fuel Trim System Rich ,
possible bad O2 sensor , dirty Mass air flow sensor -depending on the engine size - 2.2 l or 2.4 l , MAP sensor , leaking fuel injectors ,leaking fuel pressure regulator ! You should take the vehicle to a ASE certified repair facility where they can do a good diagnostic check with a scan tool ! Check engine sensor data parameters etc.....

Step

Action

Values

Yes

No

1

Did you perform the Diagnostic System Check - Vehicle?
--
Go to Step 2
Go to Diagnostic System Check - Vehicle

2

Important: Disregard any transmission symptoms, antilock brake system (ABS) indicators, and traction control system (TCS) indicators until any fuel trim faults are repaired. A fuel trim fault may cause default actions such as harsh shifts and illumination of the ABS/TCS indicators.
Are any DTCs other than DTC P0172 also set?
--
Go to Diagnostic Trouble Code (DTC) List - Vehicle
Go to Step 3

3

  1. Install a scan tool.
  2. Review the Freeze Frame/Failure Records and record the displayed data for this DTC.
  3. Select Fuel Trim Data parameter.
  4. Start the engine.
  5. Observe the Long Term FT parameter with a scan tool.

Is the Long Term FT parameter less than the specified value?
-18%
Go to Step 4
Go to Diagnostic Aids

4

  1. Start the engine.
  2. Allow the engine to reach operating temperature.
  3. Put the transmission in PARK or NEUTRAL position.
  4. Turn off all of the accessories.
  5. Allow the engine to idle.
  6. Observe the Manifold Absolute Pressure (MAP) sensor parameter with a scan tool.
Is the MAP sensor parameter within the specified range?
19-42 kPa
Go to Step 5
Go to DTC P0106

5

  1. Operate the engine at idle.
  2. Observe the heated oxygen sensor (HO2S) parameters with a scan tool.
Does the scan tool indicate that the values are within the specified range and fluctuating?
20-900 mV
Go to Step 6
Go to Step 7

6

  1. Turn OFF the engine.
  2. Visually and physically inspect the following items:
?€¢
The vacuum hoses for splits, kinks, and proper connections--Refer to Emission Hose Routing Diagram .


?€¢
The air intake duct for being collapsed or restricted


?€¢
The air filter for being dirty or restricted


?€¢
For objects blocking the throttle body

Did you find and correct the condition?
--
Go to Step 9
Go to Step 8

7

  1. Turn OFF the engine.
  2. Inspect for the following conditions:
?€¢
The HO2S for proper installation


?€¢
Ensure that the electrical connectors and wires are secured and not contacting the exhaust system.


?€¢
The HO2S signal circuit for a short to voltage--Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?
--
Go to Step 9
Go to Fuel System Diagnosis

poss

Jul 21, 2015 | Chevrolet Cars & Trucks

1 Answer

Where is the obd2 connector location on holden ra rodeo v6


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Connect white (test lead) and black (ground lead) wires that are branched from harness approximately eight inches from ECM. After leads are grounded, the "Check Engine" light will flash the diagnostic trouble codes. The DTC's are indicated by the flashing CEL.
FLASH, FLASH, pause, FLASH, FLASH, FLASH = Code 23.
If only one diagnostic trouble code is stored, the DTC will repeat continuously until test leads are disconnected. If more than one diagnostic trouble code is stored, each DTC will repeat three times, starting with the lowest, then proceed to the next DTC. After all DTC's have been displayed, the pattern will repeat.I-MARK 84-85
Connect male and female test leads taped into wire harness near ECM. After leads are connected, the "Check Engine" lamp will flash the trouble codes. The DTC's are indicated by the flashing CEL.
FLASH, FLASH, pause, FLASH, FLASH, FLASH = Code 23.
If only one diagnostic trouble code is stored, the DTC will repeat continuously until test leads are disconnected. If more than one diagnostic trouble code is stored, each DTC will repeat three times, starting with the lowest, then proceed to the next DTC. After all DTC's have been displayed, the pattern will repeat.
86-87 Impulse located near the ECM connector, is used to actuate the Engine Control Module (ECM) trouble code memory within the module. Two terminals (A and C) of this connector are used to activate the diagnostic trouble code system in the ECM. With the ignition switch turned On, engine Off, connect a jumper wire between terminals A and C. The "Check Engine" lamp will begin by flashing a DTC 12. DTC 12 = flash, pause, flash, flash. There will be a longer pause and a code 12 will repeat two more times. This code indicates the self-diagnostic system is operating. The cycle will then repeat until the engine is started or the ignition is switched Off. In most cases, DTC's will be checked with the engine running since no DTC's other than DTC 12 or 51 will be present without the engine running. Remove jumper wire from ALDL connector before starting engine. Reconnect jumper wire after engine is running.

Throttle Body Fuel Injection

The ECM test connection is located under the center console.
A built-in, self diagnostic system will identify problems in the throttle body fuel injection system. When a problem is detected, the diagnostic system will illuminate the "Check Engine" light.
When the engine is started, the Check Engine light should turn off.. If the light remains lit, the self diagnostic has detected a problem. To determine where the problem exists, ground the "Test" terminal of the connector with the ignition On, engine Off and watch the check engine light. Each DTC will flash three times (lowest to highest).

Aug 21, 2014 | Holden Rodeo Cars & Trucks

1 Answer

Nissan hardbody 3.0td loses power and dtc code 42 comes up


Problem with 1998 Honda Civic Nissan hardbody 3.0td loses power and dtc code 42 must be old nissan as 98 civics use OBD2 codes.
what year, Nissan, and is this Turbo Diesel, if yes, get the FSM
its complex.ever heard of that , FSM
the factory service manual, all cars have it.

Aug 22, 2013 | 1998 Honda Civic

1 Answer

94 gmc safari 4.3 engine codes 42 and 67


DTC - 42 Ignition bypass circuit error

DTC - 67 AC system low on charge.

Oct 15, 2012 | Cars & Trucks

1 Answer

What is service engine light code 12 mean



READING CODES USING MIL (CHECK ENGINE) LAMP

Be advised that the MIL or CHECK ENGINE light can only perform a limited number of functions and it is a good idea to have the system checked with a scan tool to double check the circuit function.

  1. Within a period of 5 seconds, cycle the ignition key ON - OFF - ON - OFF - ON .
  2. Count the number of times the MIL (check engine lamp) on the instrument panel flashes on and off.

The number of flashes represents the trouble code. There is a short pause between the flashes representing the 1st and 2nd digits of the code. Longer pauses are used to separate individual 2-digit trouble codes.
An example of a flashed DTC is as follows:


Lamp flashes 4 times, pauses, then flashes 6 more times. This denotes a DTC number 46. Lamp flashes 5 times, pauses, then flashes 5 more times. This indicates a DTC number 55. DTC 55 will always be the last code to be displayed.


0900c1528007935b.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 2: Diagnostic trouble code chart (1 of 2)-1995-97 engines


0900c1528007935c.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 3: Diagnostic trouble code chart (2 of 2)-1995-97 2.0L engines

Jul 26, 2012 | 1995 Dodge Neon

1 Answer

Gmc suburban dtc 42 what part need to replace


DTC 42 is the code for an open circuit in the power control.I would strongly recommend that you have your PCM tested for shorts.It could be a grounded circuit Or bypass circuit.My best advise would be to get your Power Control Module tested.

Feb 15, 2011 | GMC K1500 Cars & Trucks

1 Answer

Engine light on but the garage said no codes recorded


Whenever the 'CHECK ENGINE' light comes on, the ECU (Engine Control Unit) sets a Diagnostic Trouble Code (DTC). These codes identify the particular engine management system which caused the light to come on. At least there is 'FREEZE-FRAME' data stored and the associated DTC.

Oct 28, 2009 | 1996 Hyundai Accent

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