2002 GMC Sierra service 4 wheel drive light

REBORN2363

MEMBER
2002 GMC SIERRA
V8
4WD
AUTOMATIC
203,000 MILES

My service 4 wheel drive light will not go off, I have installed two new switches ig goes off for a few hours then comes back on. When the light is off the 4 wheel drive works fine, when the light comes on the lights on my push button switch goes off & my temp & compass on my mirror quit working as well.
Please help me
Preacher Lloyd

5 Replies

2CARPRO JACK

MECHANIC
11,533 POSTS

You will need to have the 4wd system scanned. Find a shop with the proper software to do the scan. It may not be the switch, it could be any one of the several systems montored by the PCM regarding the 4wd system.A scan will reveal what codes the PCM has stored in regards to this system and we can go from there

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Sunday, June 6th, 2010 AT 9:15 AM

REBORN2363

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3 POSTS

I did not pay $10.00 tp be told to take it to the shop.

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Sunday, June 6th, 2010 AT 1:28 PM

2CARPRO JACK

MECHANIC
11,533 POSTS

There isnt any way to access the information(codes) in the PCM/VCM without the proper scanning equipment. You could just throw parts at it and hope for the best, but thisis why they integrate on-board diagnostics into the systems.I have seen issues with the actuator motors on the transfer cases, but that would just be a guess.

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Monday, June 7th, 2010 AT 8:12 AM

REBORN2363

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3 POSTS

I understand, I will fina a shop & get it checked, I am al little frustated. But thanks for all your help & I will take your advice & I will use this site again.
William Pate

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Monday, June 7th, 2010 AT 3:55 PM

2CARPRO JACK