2003 Chevy Silverado 4 wheel drive trouble

MIKESC2000

MEMBER
2003 CHEVROLET SILVERADO
V8
4WD
AUTOMATIC
117,000 MILES

2003 K2500 Duramax/Allison. 117K mi.
I start my truck like any other day today, and start to back up. I notice it feels really strange (like the brake is on, or I am missing a wheel or something). Then I notice "service 4WD" on the dash monitor. Also, the light on the dash is not lit for 2WD, even when I press it. None of the drive lights are lit (2WD, 4WD, or 4WD low).
Note: I was not trying to use 4WD today, and have not used it in weeks. Must be an electronic faulure I am thinking, but I dont know. That's why I am here. Any suggestions would be great. Thanks! Mike

5 Replies

2CARPRO JACK

MECHANIC
11,533 POSTS

Check all fuses first, underhood and in the passenger compartment. Then it will need to be scanned for codes pertaining to the drivetrain. This should give us a starting point

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Friday, February 1st, 2008 AT 12:43 PM

MIKESC2000

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3 POSTS

Thanks. As an update.I just noticed now it is now stuck in 4WD low. That button is lit. What do you think about replacing the push button module?

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Friday, February 1st, 2008 AT 12:54 PM

2CARPRO JACK

MECHANIC
11,533 POSTS

Could be the problem. Most likely the cheapest part in the system.

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Friday, February 1st, 2008 AT 2:53 PM

MIKESC2000

MEMBER
3 POSTS

I did end up replacing the transfer case selector motor/switch. I think I am calling it the right name (it is the motor on the transfer case that electronically switches to 2H, 4L, 4WD.
Anyway, my truck runs now, but only in 2WD. Wont let me go into 4WD, and still says "service 4WD system" on the dash. Is it possible that the code needs to be cleared? If so, how do I do that? Where is this computer at anyway?

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Monday, February 4th, 2008 AT 9:16 PM

2CARPRO JACK