Question about 2003 Chevrolet Avalanche

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Reduced engine power light on in my 03 avalanche

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: my engine light and reduced

low voltage from batt .it is common for chevys.check alt and change the batt even if it feels fine

Posted on Jan 22, 2011

remington870
  • 48 Answers

SOURCE: 03 saturn L300, reduced power engine light came on

You are not the only one. Ive met a good many of Saturn owners (most were 2001 L300 drivers) but they were plagued with the problem you have and practically identical codes. The following remedies have been known to work:

1. Replacement Battery Cable
2.Replacement ECU Wiring Harness
3. Replacement of ECU

Posted on Mar 31, 2009

  • 1 Answer

SOURCE: Reducded Engine Power

check the wires leading to you throttle body. i had the same problem and found a broken wire on the throttle body wiring harness. i repaired the break, had the computer reset and problem was fixed. hope this helps.

Posted on Jun 01, 2009

  • 3 Answers

SOURCE: service engine soon and reduced engine power

disconnect batt. for 30 min. then reconnect,if no problem exist the lights will go away

Posted on Dec 20, 2009

  • 416 Answers

SOURCE: REDUCED ENGINE POWER IN A 03 ENVOY

may have a bad throttle body check for codes if you have a p01516 must of the time it is a throttle body problem

Posted on Jan 19, 2010

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1 Answer

I have an 07 avalanche z71. I was driving the other day and the truck went into reduce engine power traction control disable check engine light and service air bag. Now it does it after five miles.


Get a computer diagnostics done and it will likely tell you what is wrong. You can buy readers now for less than $100.00. Otherwise you are really guessing.

Oct 02, 2016 | 2007 Chevrolet Avalanche LTZ

1 Answer

Gm code p2120


Code p2120 is accelerator pedal position sensor APP sensor 1 circuit apparently this is known as the reduced engine power syndrome and is quite common on the avalanche. There is no mechanical linkage from gas pedal to throttle body and it is quite common for the throttle position sensor located on throttle body to mess up and throw this code and also for one of the wires to the throttle position sensor to get hot become brittle and sometimes break. I would start there

Aug 04, 2014 | 2003 Chevrolet Avalanche

1 Answer

Reduced engine power


LIMP IN MODE re-set your pcm if it re-occurs you may have a transmission slippage issue or a faulty shift selonoid in transmission. with stabilty control feature on some models a bad wheel speed sensor or hub bearing can cause the same but usually accompanied with ABS light

Dec 10, 2013 | Chevrolet Avalanche Cars & Trucks

1 Answer

Will a frozen battery reduce engine power??


gasses could build up and cause explosion. thaw slowly and then recharge.

Jan 30, 2013 | 2003 Chevrolet Avalanche

1 Answer

I have reduced power engine light on my 2002 avalanche


I would have the computer scanned for trouble codes next.

Jun 27, 2012 | 2002 Chevrolet Avalanche

1 Answer

My 2003 chevy avalanche has been having the REDUCED ENGINE POWER warning and the engine cant acelerate.


I'm an owner who had this problem on / off for a year. Several returns to dealership proved hopeless. Service shop devulged that '03 Avalanches had a overall electric problem that could not be detected. I legally forced dealership's hand...They replaced the entire wiring harness at no cost. No problem since. George

Sep 16, 2011 | 2003 Chevrolet Avalanche

1 Answer

03 avalanche z71 reduce engine power came on whats the cause


Did your check engine light come on? To really determine the issue you need to hook a scanner up to your vehicle and pull the codes. Once you know the codes then you have the information for a diagnosis.

Jan 15, 2011 | 2003 Chevrolet Avalanche

1 Answer

Service engine soon and reduced engine power


disconnect batt. for 30 min. then reconnect,if no problem exist the lights will go away

Dec 20, 2009 | 2003 GMC Envoy

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