Pontiac Grand Prix Forums : Grandprix

Is the t.p.s. located on the bottom of the gas pedal? And is it a common problem with the drive by wire TB to go bad on these? thanks

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Black 98 Regal GS: best run 13.95@99.75
99 Red GP L36: 15.5 in 1/4

No it is almost impossible. It is a reduntant system (there are 2 potentiometers working side by side) if one fails the other is used. The TPS is part of the gas peddle. I think it's up on top under the dash next to the fire wall.

You may have a broken wire or bad connection to the sensor itself.
Here is the schematic diagram.

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06 GT, HPtuner, PLX Wideband, AFC2.0, K&N CAI, PEM/PLOG 3"DP, ZZP 3.5MPS, CORSA CATBACK, GMPP STB's, GMPP HD Tarms

wow! thank you for the quick response. What would you think would be at fault if a t.p.s. code is present. Now the car runs perfect and light is back off, but when it was messing up the car had no acceleration or power. The pedal sensor or the big bulky TB.

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Black 98 Regal GS: best run 13.95@99.75
99 Red GP L36: 15.5 in 1/4

Do you know what the actual code was? That would be a big help in narrowing it down.

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06 GT, HPtuner, PLX Wideband, AFC2.0, K&N CAI, PEM/PLOG 3"DP, ZZP 3.5MPS, CORSA CATBACK, GMPP STB's, GMPP HD Tarms

The code is P0068 then it says see service manual. I asked my friend at a repair shop that brought it up on his mitchell said it is tps sensor.

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Black 98 Regal GS: best run 13.95@99.75
99 Red GP L36: 15.5 in 1/4

OK that helps.
That code will get set when the PCM sees a condition where it compares engine load and air flow through the intake with the expected throttle position. If the throttle position is not where the PCM expects it to be then it will reduce engine power and put up that code.

My bet is you had a problem with to much airflow or a leaking vaccum line.

Check the following:
The vacuum hoses for splits, kinks, and improper connections as shown on the Vehicle Emission Control Information label--Inspect thoroughly for any type of leak or restriction.

Air leaks at the throttle body mounting area and the intake manifold sealing surfaces

Restrictions in the Air Intake System, including the filter.

Check the throttle body as well:
Loose or damaged throttle blade
Broken throttle shaft
Damaged throttle body

I doubt very much that it's the TPS. It's one of the things above that caused the code. As long as it isn't showing up your OK but it never hurts to go through and check it out.
Hope you find the problem.

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06 GT, HPtuner, PLX Wideband, AFC2.0, K&N CAI, PEM/PLOG 3"DP, ZZP 3.5MPS, CORSA CATBACK, GMPP STB's, GMPP HD Tarms

thank you very much for you help, tomorrow I will look into it some more. You guys are great on this forum!

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Black 98 Regal GS: best run 13.95@99.75
99 Red GP L36: 15.5 in 1/4

I'd say start small, It sounds like a dirty air filter could cause this code (reduced air flow)... then work towards the harder stuff

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2002 GT...Wizardair, ZZP 2.5 o/r dp, Special Eddition two-tone leather interior added, HUD added, 12" Brake Upgrade,strut tower bars, gmpp sway bars, poly motor mounts, -6an braided SS fuel hoses , Hptuned, Headers, Top Swaped.....
I've got Boost!! Top swap Quesions? Click Here

...need to check out MAP/MAF sensors also-- see official troubleshooting info --

Attached Images

P0068.jpg (87.3 KB, 3 views)

Like was said earlier, there are two APS's (Accelerator position sensor) on the car for safety reasons. When one fails, the car will go into "limp" mode so you will know that there is a problem. Whether it is a sensor, wire, or module, only a proper diagnosis will tell. If I remember correctly, you have to have a fault with the APS circuit to set the APS code, so I don't think that an air filter would cause the problem. However, a dirty, sticking throttle plate could. In reality, if the air filter was that dirty, you will have a serious fuel trim issue.

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Proud Owner of the World's First Six-Speed FWD Grand Prix!