I have a 2008 Pontiac Grand Prix that is giving me an error message of "reduced engine power." Why?

Asked by Jan 29, 2014 at 10:41 AM about the 2008 Pontiac Grand Prix

Question type: Maintenance & Repair

I was just driving to work one morning and the check engine light came on and I got the error message of "reduced engine power." I suddenly had not power when I stepped on the accelorator. My husband took it to Autozone to have the fault code read and said it had something to do with the accelorator and a sensor. What is he talking about?

5 Answers

135

Your Mass Air Flow sensor became unplugged or unhooked. Rare that a MAF would go bad to where it would need to be replaced, but can happen. It should take care of the check engine light after being reset, if that was why it came on. Good luck! Johnny Houseman Finish Line Automotive Owner 616-299-3210

1 out of 1 people think this is helpful.
4,305

Your car has a Accelerator Position Sensor which tells the engine computer how to adjust the timing and air/fuel based on where the gas pedal is. When the sensor or wiring harness goes bad, the computer doesn't know what to do and puts the engine into "safe mode" which reduces the engine power. This is what you're seeing. Get the pedal position sensor replaced, have them check the steering column and pedal harness connections as well, you should be okay.

2 out of 2 people think this is helpful.
120

Had this issue with my 04 Grand Prix. When in park, I'd press the accelerator and it wouldn't get past 1300 RPM. When driving, we would have to take off very slowly after a complete stop and even then, couldn't go past 65 mph. Replaced the mass air filter, the computer, and pedal/accelerator position sensor. None solved the issue and the car would still show the "reduced engine power failure" thing. Finally took it to some dude that had a $6k computer error reader thing and it came up with the throttle bottle assembly. After spending money on all this other stuff we said why not, so we went ahead and changed it. It cost a little over $300 at the local auto parts store ao we went to a junkyard/you- pull-it place and found the car we needed. We took it off right then and there. It doesn't take but 10-15 minutes to get out and put back in. all you need is a 10mm socket and git r done!! Sparked up the car and BAM!! We were able to press the gas and it picked up right away. It's been working fine for a small trip now and looks like this fixed the problem!! It was the throttle bottle assembly. When we took the original one out, the gasket was totally worn out and looked pretty ugly. That may have been it but just replaced the whole thing. Good luck!!

1 out of 1 people think this is helpful.
10

mine stalled out a couple of times and it would reset clock and day/date etc... my mechanic says gas pedal sensor..does that sound right? my car is at shop now...

1 out of 1 people think this is helpful.
10

no power at stop and said reduced engine power ,, once going it ran o.k. but idle was rough

Your Answer

Add photo

Related Questions

  • Reduced engine power on a 2008 Grand Prix 74 answers

    I have a 2008 Grand Prix, that worked great until last march when i put it in the ditch. it got all fixed from that. But just this past week i was driving it and it came up with REDUCED ENGINE POWER...

    2008 Pontiac Grand Prix Base

    -

    Maintenance & Repair

  • Reduced Engine Power 2008 Grand Prix 2 answers

    I have a 2008 Grand Prix. for the last two weeks or so the reduced engine light has been signaling I can go as fast as I want but it takes a lot longer to speed up the RPM's don't go over 1500 and...

    2008 Pontiac Grand Prix Base

    -

    Maintenance & Repair

  • reduced engine power light 19 answers

    I have a pontiac grand prix 2005 the reduced engine ligh comes on (mor so in rain) the car will not excelerate above 30 pmh or so and the it will completley stall out. Usally if I wait 10 to 15 mins...

    2005 Pontiac Grand Prix GXP

    -

    Maintenance & Repair

  • (Help) how to get my car out of reduced power mode 11 answers

    help my 05 gt keeps going to reduced power and traction control off mode. I got codes p1125 p2120 my machine says the acc position sensor has already been replaced. Someone tried to fix this problem...

    2005 Pontiac Grand Prix GT

    -

    Maintenance & Repair

  • It appears hundreds of owners are experiencing the issue of "Reduced Engine Power", This should be a GM recall. 2 answers

    It appears when GM decided to go from a throttle cable system, to a computerized sensor is where they made their error. Their should be a recall issued on all GM vehicles. I was told the cost may be ...

    2008 Pontiac Grand Prix Base

    -

    General

Grand Prix

Looking for a Used Grand Prix in your area?

CarGurus has 3,766 nationwide Grand Prix listings starting at $1,995.

ZIP:

Search Pontiac Grand Prix Questions

Pontiac Grand Prix Experts

#1 Js08016
Js08016
Reputation 3,770
#2 Tom Demyan
Tom Demyan
Reputation 2,510
#3 munron
munron
Reputation 2,010
View All

Related Models For Sale

Used Chevrolet Impala
950 Great Deals out of 36,331 listings starting at $884
Used Pontiac G8
19 Great Deals out of 405 listings starting at $5,000
Used Dodge Charger
564 Great Deals out of 28,745 listings starting at $2,275
Used Pontiac G6
140 Great Deals out of 4,930 listings starting at $999
Used Chevrolet Monte Carlo
19 Great Deals out of 1,738 listings starting at $1,695
Used Chevrolet Malibu
1,162 Great Deals out of 78,644 listings starting at $2,495
Used Chrysler 300
527 Great Deals out of 20,643 listings starting at $1,500
Used Ford Mustang
691 Great Deals out of 38,146 listings starting at $1,750
Used Nissan Maxima
411 Great Deals out of 25,129 listings starting at $1,500
Used Jeep Grand Cherokee
1,116 Great Deals out of 69,510 listings starting at $1,500
Used Dodge Challenger
435 Great Deals out of 25,095 listings starting at $7,980

Used Cars For Sale

2008 Pontiac Grand Prix For Sale
13 Great Deals out of 472 listings starting at $1,995
2007 Pontiac Grand Prix For Sale
513 listings starting at $2,000
2006 Pontiac Grand Prix For Sale
7 Great Deals out of 618 listings starting at $2,000
2005 Pontiac Grand Prix For Sale
448 listings starting at $4,000