Question about 2002 GMC Yukon Denali

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How do i turn off service engine light on 2002 sierra denali?

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You can go to any major auto parts store and barrow their OBDII Scan tool.
And all you do is shut all electronics off in vehicle like stereo heater etc.. then you insert your key in the ignition turn forward (not starting it ) Then on the driver side under the dash there should be a USB Connector and you will plug in the cord to that adapter and the device will start to scan the codes. After that it will tell you on the screen what the codes are and what problem it found so you will write it down codes and problem then just hit the erase button and this will re set your engine light. Then just unplug the USB Cable and shut your ignition off.
After all of this your light should stay off up to 50 miles if it comes back on then you have a problem like a bad O2 sensor most cars have three of them and the other problem would be is a MAF Sensor on your air intake. These are the most common problems to set the engine light off.

Good Luck!

Posted on Feb 07, 2010

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The only way to turn it off is to fix the reason that is causing it to come on. Have it scanned by a repair shop, they can diagnose it and tell you what it needs.

Posted on Feb 07, 2010

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The other way you can solve this problem is to disconnect and remove the POSITIVE cable on the battery wait 30 seconds before reconnecting the cable this will reset the computer but as stated earlier if it comes back on after 50 miles get it checked at the dealer.. I have a Ford with the same problem and it has cost me $50 every 3 months to have it reset seems it does it whether there is a problem or not so far to date I have had it set 6 times no problems found..so now I do it on my own..

Posted on Feb 27, 2010

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Posted on Jan 02, 2017

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1 Answer

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1 Answer

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3 Answers

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File In Section: 01 - HVAC
Bulletin No.: 01-01-39-007
TECHNICAL
Subject:
Loss Of HVAC System Mode and/or Temperature Control 

(Reroute Wiring Harness)
Models
1999-2002 Chevrolet and GMC C/K Pickup Models (Silverado and Sierra) 1999-2002 Chevrolet and GMC C/K Utility Models (Avalanche, Suburban, Tahoe, Yukon, Yukon XL, Denali) 2001 GMC Sierra C3
2002 GMC Sierra Denali
2002 Cadillac Escalade, Escalade EXT
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Cause
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If the warranty campaign is over i am sure they can or may have in the system on how to correct the problem.
Good luck and hope this helps, keep me posted if you need help on to the repair procedure.


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1 Answer

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1 Answer

Service Engine light on, car feels likes it's going to stall when stopped, and feels like it's vibrating. 2002 GMC Envoy


Service Engine light on, car feels likes it's going to stall when stopped, and feels like it's vibrating. 2002 GMC yucon denali

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