Question about 2004 Pontiac Grand Prix

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Reduced engine power warning light

Just came on while car was runnning in park and the engine started shutting itself down. I cleared the codes and car runs normal. Looking for an answer to the problem?

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  • Pontiac Master
  • 354 Answers

Did you get the codes before you cleared the memory? The codes play an enormous part in diagnosis. If you did not copy the codes befored you cleared them make sure if it happens again that you do.

Posted on Mar 22, 2014

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Posted on Jan 02, 2017

  • 42028 Answers

SOURCE: vehicle wont start reduced power engine light comes on

run fault codes to determine the failing sensor.

Posted on Jan 08, 2014

jturcotte
  • 8142 Answers

SOURCE: my car shuts off, reduced engine light power

please have the car scanned for trouble codes. Many parts stores provide free scans.

Posted on Sep 04, 2010

jdhnmi
  • 143 Answers

SOURCE: I have a 2004 grand

i had a problem with all my lights coming on in my 2006 explore took it to dealer to find out that the battery was dying replaced it and they went away

Posted on Mar 26, 2011

ZJLimited
  • 17970 Answers

SOURCE: engine power reduced

If the warning liught come on, I suggest scanned the computer car in order to know what fautl code is stored there; note this code num ber and send us for other details.

Posted on Aug 23, 2012

  • 90 Answers

SOURCE: throttle position sensor 06 grandprix gt

O2 sensors can cause this and often they clear up after a good run.

Posted on Nov 21, 2013

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1 Answer

03gmc envoy showing code p1514 and reduced power light on engine shuts down


Type: OBD & your codes

OBD PO 440
OBD PO128

Codes have nothing to do with installing parts

Codes are System Faults only

Codes are used to diagnose a system & component
test to find a problem

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1 Answer

Reduced engine power


Have the vehicle checked for DTC'S - diagnostic trouble codes ! Do you know what electronic throttle control is ? The gas pedal assembly has electrical connector an sensors inside ,hooked to the PCM / ECM - engine computer . The engine computer uses these position sensors inputs to control the DC motor on the throttle body to open the throttle plate to control the speed . Plus there are position sensors inside the throttle body to input PCM/ECM to see if it's calculations are corect . Your best bet maybe to take it to a qualified repair shop .
Drive by Wire Function and diagnostics by Wells

Reduced Engine Power Mode
When the PCM detects a condition with the TAC system, the PCM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
• Acceleration limiting--The control module will continue to use the accelerator pedal for throttle control; however, the vehicle acceleration is limited.
• Limited throttle mode--The control module will continue to use the accelerator pedal for throttle control; however, the maximum throttle opening is limited.
• Throttle default mode--The control module will turn off the throttle actuator motor and the throttle will return to the spring loaded default position.
• Forced idle mode--The control module will perform the following actions:
- Limit engine speed to idle by positioning throttle position, or by controlling fuel and spark if throttle is turned off.
- Ignore accelerator pedal input.
• Engine shutdown mode--The control module will disable fuel and de-energize the throttle actuator.

May 12, 2017 | 2004 GMC Sierra Denali

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My escalade flashed a warning light to reduce the engine power it then shut down and wouldnt start


Your Escalade has put itself into "limp home mode", it is protecting you from destroying the engine or transmission. I would take it to autozone or Pepboys let them scan it for a stored code....it could be several different things.

Mar 21, 2014 | 2002 Cadillac Escalade

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Check engine light, car slows down


the engine light came on and the sensors immediately put the car in limp mode reducing the power to allow you to pull over and do the vital checks (oil -water and engine temperature ). have the fault codes read to see which sensor put the lights on.

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Why does the engine shut off on 2006 hhr when message engine power reduced displays


Could be something causing the engine to die which is making the warning light come on, or something that the computer sees as a threat of damage to the engine and the computer is shutting down the engine to prevent damage.
You would have the computer scanned for trouble codes and then proceed with troubleshooting the issue.

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2 Answers

It doesnt do it usually when driving but if the engine is at normal operating temps and after a shut down for a few minutes it is dificult to start and the reduced engine power light flashes on the screen...


You are not supposed to just clear the codes, but read them and interpret them.
The reduced engine power light means it is going into limp home mode.
You then are not supposed to drive it.
Tell us the codes and them maybe we can help you.
Don't keep driving it, or you will eventually get totally stuck.
The codes are extremely important, and should be fixed.

Nov 18, 2010 | Chevrolet C2500 Cars & Trucks

1 Answer

I have a toyota rav 4 1996 & the engine warning light has just started to come on & the car loses power as soon as the light goes on & then the light will just go off & the car runs normal...


Does it loose power all together as if the engine shuts down or does it go itnto a reduced power state?

Check all of your fluid levels. Keep an eye on all of your other gauges when this happens. Some vehicles will automatically go to a reduced power state to protect itself from damage if overheating etc.

More likely, another simple problem could be a loose connection somewhere. Start by checking your battery terminals, and any connections under the hood that can vibrate loose. Typicallly if a problem just "goes away" suddenly. It is an electrical problem.

Oct 23, 2009 | 1996 Toyota RAV4

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Reduce engine light comes on with a/c use.


Most likely it is the fan clutch as it is computer controlled. I have had 2 in the shop this year with the same problem. To be sure, have someone check the codes before you start spending your hard earned dollars.

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2006 chevy cobalt "reduced eng pwr" warning came on today


Hey had the problem before when my car went dead. I jump it the the ENG PWR REDUCED thing came on. I shut it off. Look a the fuse under the car. Found the ecm of pcm fuse change it out then it work. had not have a problem sence.

Jan 18, 2009 | 2006 Chevrolet Cobalt

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