20 Most Recent 2002 Pontiac Grand Prix Questions & Answers


a problem axle will vibrate worse the faster you go but the vibration will be there up or down so for the moment I will set that aside.
if it is vibrating during acceleration but stops when the accelerator is released, it indicates and engine /transmission management problem
first I would run the fault codes as the problem could be from a faulty cam position sensor
servo/solenoid that has the cam too far advanced for the engine rpms and power setting
next it could be a problem with injector control or fuel flow/ pressure
have the fuel pressure tested at rpms to ensure that the pressure regulator is operational
what you describe occurs from misfiring or the like so go to an accredited service center for a proper diagnosis and quote
back to the axle --it could be a problem wheel bearing failing or needing adjustment so keep that in the back of your mind if nothing shows up in the fault codes or diagnosis from a shop with experience

2002 Pontiac... | Answered on Jan 01, 2020


Sometimes on the shifter its self they use two different items, some use a medal rod and some use a cable like an ebrake. if its a cable one it may have stretched and isn't going back to its actual spot for the instrument lights to work properly. you can tighten that cable.that's all I can think of right now good luck.

2002 Pontiac... | Answered on Jul 24, 2019


The valves on the 3800 series 2 engine are not adjustable.

2002 Pontiac... | Answered on Jul 07, 2019


I think they are M14 x 2.0 x 49 mm thread for the bracket mounting bolt.

2002 Pontiac... | Answered on May 14, 2019


You will need to either disconnect the battery for about a minute or reset with a scan tool or code reader.

2002 Pontiac... | Answered on Nov 12, 2018


OBD port connector ? Under the steering column area left or right of the column .

2002 Pontiac... | Answered on May 20, 2018


Bad ignition switch

2002 Pontiac... | Answered on Jan 27, 2018


Is the security light lit on the instrument cluster ? Anti-theft system problem ?
DTC P0131
Heated oxygen sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the vehicle is first started the powertrain control module (PCM) operates in an Open Loop mode, ignoring the HO2S signal voltage when calculating the air-to-fuel ratio. The PCM supplies the HO2S with a reference, or bias, voltage of about 450 mV. The HO2S generates a voltage within a range of 0- 1,000 mV that fluctuates above and below bias voltage once in Closed Loop. A high HO2S voltage output indicates a rich fuel mixture. A low HO2S voltage output indicates a lean mixture. Heating elements inside the HO2S minimize the time required for the sensors to reach operating temperature, and to provide an accurate voltage signal. This DTC will set if the HO2S 1 voltage remains below a calibrated amount for an excessive amount of time.
Each HO2S 1 has the following circuits:
• HO2S 1 high signal
• HO2S 1 low reference
• HO2S 1 heater ignition voltage
• HO2S 1 heater low control
• Low reference loop

2002 Pontiac... | Answered on Nov 17, 2017


Check spark, check fuel delivery to engine. Check OBD2 fault codes.

2002 Pontiac... | Answered on Nov 09, 2017


leave the key in the ignition, turned to 'run' (just before the crank position) and leave it there for about 15 minutes-the security light will then stop flashing-do NOT turn it off, turn it to crank and start the car. You have a security module that is not seeing the same resistance in the ignition switch as it expects, meaning you will have to either replace the ignition switch (expensive) or bypass the module (easy and inexpensive)-I have done lots of these, requires about 15 cents worth of parts and can be done in 1/2 hour.

2002 Pontiac... | Answered on Oct 28, 2017


hey, ihad this problem with abx and trac off light on all the time even after having replaced the wheel bearing twiice. how i fixed it was to replace the wiring harness and poof issue resolved. a technical service bulletin is available for this issue

2002 Pontiac... | Answered on Oct 28, 2017


You need to replace the radiator thermostat and water temperature sensor and flash out old coolant.

2002 Pontiac... | Answered on Oct 23, 2017


You probably have a problem with one or both of the front brakes - probably a wheel bearing shot and ABS sensor failed or disconnected. I would take to a brake shop immediately, and not attempt a long run with the car.

2002 Pontiac... | Answered on Oct 10, 2017


Fuel pump.

2002 Pontiac... | Answered on Sep 25, 2017

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