Question about 2004 GMC Envoy

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My boyfriend has a 2004/05? GMC Envoy... the headlights stay on even when the vehicle is not running and locked.. Any suggestions?

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  • 36 Answers

Yes it has a bad BCM (body control module) its the computer that operates things like lights door locks and other things on a vehicle. dont get this confused with the ECM engine control module.

Posted on Jan 27, 2009

  • MELISSA Dec 02, 2011

    i have the same problem how do we fix the BCM?????

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2004 gmc envo when engine is off and in park headkights stay on


Do they stay on after key is removed from ignition lock cylinder ?

Check HDM relay 46 in the under hood fuse / relay box . Relay contacts stuck closed , possibly ! The relay supplies B+ voltage to the low beam fuse's ! Let me know if that works or not . If not , will go on too more diagnostics steps .

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No idea what your even typed here

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1 Answer

I have a 2003 gmc envoy and my headlights wont shut off while the vehicle is turned off and when its on and i turn the switch to off they still stay on Any answers


The headlight switch provides a ground signal to the body computer, which controls a headlight relay. Its possible the relay is stuck on, or there's a problem with the body computer.

Feb 20, 2014 | Cars & Trucks

1 Answer

GMC 2004 Envoy blows heat even with blower off ... Why ?


The relay in your blower motor is stuck on, there is a TSB for this issue. Replace the blower motor resistor and you'll be back in business.
How does the resistor get power if the fuse is pulled?
Replacing the resistor will cure both problems. TSB is a technical service bullitin seen below
Subject:HVAC Blower Motor May Run Continuously After Vehicle is Turned Off (Replace Blower Resistor Relay)Models:2004 Chevrolet Avalanche, Silverado, Suburban, Tahoe, TrailBlazer, TrailBlazer EXT2004 GMC Envoy, Envoy XL, Sierra, Yukon, Yukon XLwith Manual Control HVAC (RPO CJ3)Built Prior to August, 2003

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1 Answer

Headlights stay on when 2005 gmc envoy xl is off


Hello David..some GM vehicles have a feature called Twilight Sentinel which provides a couple of minutes of "headlight on" time after turning the vehicle off. (Check your owners manual for this features operating instructions.)

If your headlights never turn off, the failure is most likely in the headlight switch as headlights are wired hot...meaning you can turn them on without the key in ignition.

Apr 14, 2013 | 2005 GMC Envoy Xl

1 Answer

My 2006 gmc envoy is having problems with the four wheel drive...when its in 4wd and I turn right or left..its like the brakes are locking up or something is preventing my truck from moving....does anyone...


never use 4wd on dry pavement even just wet pavement can cause this. 4wd is for only snowy or slippery conditions

unless this is automatic 4wd or awd than u have a problem id suggest you find a forum for youre vehicle and post it there find one by googleing gmc envoy forums or chevy trailblazer forums as they are the same thing

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1 Answer

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Both low beam head lights are burnt out? blown fuse.

Sep 09, 2009 | 2003 GMC Envoy

1 Answer

Electrical malfunctions in 2006 GMC Envoy XL


Check your ignition switch by checking the voltage at the fuses for affected circuts vs. other circuts that are working well...

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1 Answer

Blower motor wont shut off


Check your blower resister in duct right in from of motor. These tend to burn out and short every once in a while

Dec 31, 2008 | 2004 GMC Envoy

1 Answer

2004 Envoy Headlights won't turn on


appears to be bad headlight switch

Nov 06, 2008 | 2004 GMC Envoy

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