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P1639 - 2002 Oldsmobile Alero

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What does it mean when you get GM dtc code P1639 . on my code reader says O2sensor B1S1 fail lean to rich rich to lean response ratio mean ?would replacing the sensor fix it originally got a 5 v

Bank 1 Sensor 1 is the oxygen sensor, the error is because the difference in readings between the sensors I don't know what you mean about 5V

Dec 27, 2017 | Cars & Trucks

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2003 cadillac dts, i have cods, p1822,p1842,p1843, p1639,i no what they say just dont no were to look,

If the TCM detects a transitional state between D2 and D3, then DTC P1822 sets. DTC P1822 is a type B DTC.
The transmission manual shift shaft switch assembly is a sliding contact switch attached to the control valve body, within the transmission. The four inputs to the transmission control module (TCM) from the switch indicate which position is selected by the transmission selector lever. This information is used for engine controls as well as determining the transmission shift patterns. The input voltage at the TCM is high when the switch is open and low when the switch is closed to ground. The state of each input is displayed on the scan tool as IMS. The four IMS input parameters represented are Signal A , Signal B, Signal C and Signal P (Parity).
DTC P1842 sets when either of the following conditions occurs:
• The TCM detects an open in the 1-2 shift solenoid valve circuit when HSD2 is commanded ON.
• The TCM detects a short to ground in the 1-2 shift solenoid valve circuit when HSD2 is commanded OFF.

Conditions for Setting the DTC
DTC P1843 sets when the TCM detects a short to voltage in the 1-2 shift solenoid valve circuit.

You have a short in shift solenoid bring down the Five volt reference circuit of the ECM - engine computer .
P1639 Cadillac PCM 5 Volt Reference Voltage Circuit Condition Couldn't find this DTC listen in the factory service repair manual . Your vehicle doesn't have a PCM , your vehicle has two separate modules . TCM for the transmission and ECM - engine control module .
How to check the 5v reference circuit for short to ground Cadillac

Sep 12, 2017 | Cadillac Cars & Trucks

1 Answer

My car won't accelerate seems there is no pressure its Audi A4 2006

Most of the time when an epc light comes on and you have no throttle response it's best to connect it to a bag-com but if you don't have one have the computer scanned for a check engine code remember just because there's no check engine light on doesn't mean the ecu doesn't have on in memory.. So if you do have a code like p1639 then you have a bad accelerator peddle

Nov 08, 2016 | 2006 Audi A4

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Dose this mean computer die?wont start new fuelpump so where do i go from here ? new computer or what

Take it to a ASE certified repair facility ,they'll fix it up ! Don't just replace parts !!!!!

P0171 - is a lean code bank 1 -possible vacuum leak , low fuel pressure , plugged fuel filter ,
P0300 - is a random misfire code which is understandable with a lean code .
P0420 As the code description implies the P0420 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem. If the P0420 code is combined with other codes, try fixing the other codes first
P0452 - EVAP Control System Pressure Sensor Low Input
P0446 - Evaporative Emission Vent System Performance
P0453 - Fuel Tank Pressure Sensor Circuit High Voltage
P1639 - PCM 5 Volt Reference Voltage Circuit Condition
P1653 - Power Steering Output Circuit Malfunction
P1651 - Fan 1 Relay Control Circuit
If you don't know what your doing take it to a repair shop before you waste your money ! You have a lot of problems here an I don't think the computer is bad , I'd say lack of maintenance ! You need to learn how to test thing's to fix them ! From the five volt reference voltage code , I'd say one of your sensors is shorted internally bring down the ref. voltage circuit causing the no start, but then again the 5volt ref. circuit in the PCM could be the problem . What you need to do is Disconnect all sensors that receive 5volt ref. signal one at a time an see if it will start . If I knew what year vehicle yours is I could tell you what sensors ! MAP, TPS , etc...

Jul 06, 2015 | Oldsmobile Silhouette Cars & Trucks

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N o revs p1639 p1631

My generc code list says:
P1631 - Theft deterrent start enable signal incorrect/Main relay malfunction (Power hold)
P1639 - Vehicle ID block corrupted or not programmed.

Scan the immobiliser system and if necessary re-code/program.

Sep 26, 2013 | Cars & Trucks

2 Answers

My 2003 chevy impal idles very high an i found 3 codes that are p0113,p0401,p1639,can anyone help me understand whats going on

p1639 is low a/c refrig. so that's not it. p0113 is low intake air temp. which is telling the computer its -38 f. This can cause the idle to be raised. and p0401 is EGR flow test failed.
Can you post what motor this has 3.8 liter or the 3.4 liter. This is something that we need to know.

Feb 14, 2011 | Chevrolet Impala Cars & Trucks

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A p1639 code on a 03 pontiac grand am

That code is the 5 volt reference circuit for the a/c pressure sensor and the fuel tank pressure sensor. Disconnect either sensor, one at a time and check for 5 volts at each end to see which end it is having the problem on. Sometimes you can reset the code and it will never come back on again.

Jan 10, 2010 | 2003 Pontiac Grand Am

1 Answer


transmission problems take it to a transmission shop most likelt the torque converter

Jun 12, 2008 | 2002 Chevrolet Blazer

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