Question about 2003 GMC Envoy

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A few minutes after I turn the engine off on my 2003 envoy one of my tail lights comes on and stays on. what should I check? thanks

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Which of the tail lights comes on? Is it the parking light or brake light? And is it only one side that is coming on? This is a very strange symptom. The Body Control Module (BCM) controls the light and could be the problem, but before replacing it, a good diagnosis needs to be done.

Posted on Oct 05, 2010

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1 Answer

2003 GMC Envoy have no brake lights, only the top light on the gate works, can you help thanks


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1. Clean your throttle body with throttle body cleaner, with the battery disconnected. Needs to be shiny. When finished, drive around for 20 minutes or so with all accessories turned off, so the computer can relearn the newly cleaned TB. About $7 for the cleaner

2. Replace your spark plugs with A/C Delco 41-103, will idle better with this plug. Around $7 ea
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1 Answer

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Could be oxygen sensor in exhaust, if it gets a little too much rich exhaust it will come on intermittenly and go off when it dries out

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1 Answer

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1 Answer

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This sounds like your alternator maybe going bad. When your alternator starts to go bad lights such as headlights, radio lights will go dim wipers will start to move slower but if you cut one of the things off such as the wipers the lights will get brighter for a few minutes then not long the car will shut completely down. Hope this helps.

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