20 Most Recent 2008 Pontiac Grand Prix Questions & Answers

Or the oil you have supplied it with is completely the wrong viscosity (most likely, or your oil feeder rail is contaminated with gelatinous old oil, which is blocking rail holes this preventing the lubrication of all moving parts, final option is the temp & pressure sensors are malfunctioning also due to oil not reaching the correct destinations mainly due to viscosity so can't build pressure or because the oil rail is clogged preventing proper circulation. I hope this helps, regards Jem

2008 Pontiac... | Answered on Sep 22, 2019

P1125 ????
DTC P1125: Accelerator Pedal Position (APP) System

Circuit/System Description
The throttle actuator control (TAC) system uses two accelerator pedal position (APP) sensors to monitor the accelerator pedal position. The APP sensors 1 and 2 are located within the pedal assembly. Each sensor has the following circuits:
• A 5-volt reference circuit
• A low reference circuit
• A signal circuit

2008 Pontiac... | Answered on May 16, 2019

hook a voltmeter at iddle should be at least 13.5 v if the condition of your belt is ok tension wise and the idle about 800 rpm replace the alternator your voltage regulator went bad

2008 Pontiac... | Answered on Oct 02, 2018

Sounds like the automatic light sensor is acting up,
Or the light switch is intermittent and bad. Also there is a relay in the fuse box that can stick causing the lights not to Go off. Check that. But I suspect the light switch itself because all the lights get controlled there.
Good Luck, Bill

2008 Pontiac... | Answered on Jan 07, 2018

coil pack possibly defective

2008 Pontiac... | Answered on Dec 06, 2017

I feel I would take the car back and tell them to repair what they messed up. They will likely say they did nothing wrong. Worth a try.

2008 Pontiac... | Answered on Dec 13, 2016

What brand part did you use ? Dorman ? OE ? Did you test the circuitry ? Did you just read the code an replace the part ? 2009 Chevy Silverado P2138 Accelerator Pedal Position Chevy is same as pontiac ! Drive by Wire training

2008 Pontiac... | Answered on Nov 30, 2016

Hello Nolimit Jbird,

Repeating the same RIDDLE DOES NOT HELP...

Yes flushing that radiator is a great idea...
After a while all the fluids lose their efficiency...

Make sure you follow OPTIMUM MIX recommendations
ELSE your did-similar metals can start some SERIOUS CORROSION.

Don't forget that brake fluid... clutches, transmission, power steering... and yes... even DIFFERENTIALS need to be MAINTAINED...

If you want to preserve the operation design efficiency of your MACHINE... any machine.

Lotsa luck with these cryptic riddles!!

Carnac the Magnificent

2008 Pontiac... | Answered on Nov 26, 2016

What code did you pull ? How do you know it's bad ?
Remove the transaxle. Refer to Transmission Replacement for the 4T65-E transmission. Drain the cooling system. Refer to Cooling System Draining and Filling . Remove the bolts (2) from the knock sensor heat shield (1). Disconnect the knock sensor electrical connector (3) from the knock sensor.

2008 Pontiac... | Answered on Sep 14, 2016

Your keys have chips in them, there is no bypass, you'll have to get at least 1 key programmed.

2008 Pontiac... | Answered on Sep 08, 2016

Really need the year make and model...but most relays are in the underhood fuse box. Do any of the doors lock? Did they all quit locking at once? Have you tried the other lock button?

2008 Pontiac... | Answered on Aug 30, 2016

check the fuses and relays

2008 Pontiac... | Answered on Aug 24, 2016

A/C COMP Relay - try replacing the A/C compressor clutch relay # 38 in under hood fuse / relay box . ! Could be shorting out after hot . I don't won't to get to technical on you, doing voltage drop testing on the circuit . If not relay the compressor clutch coil could be going bad when heating up . There are videos on you tube , testing A/C compressor clutch relay .

2008 Pontiac... | Answered on Jul 18, 2016

All the doors are affected?

2008 Pontiac... | Answered on Jul 11, 2016

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