what does service 4 wheel drive light mean - Chevy and GMC Duramax Diesel Forum

01-04.5 LB7 Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

 
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post #1 of 3 (permalink) Old 07-18-2012, 07:07 PM Thread Starter
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what does service 4 wheel drive light mean

its my grandpas truck he called the other day asking me if i could look at his truck the service 4x4 light came on. Its and 02 with around 150k on it with the lb7. Just looking for a few places to start. thanks
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post #2 of 3 (permalink) Old 07-20-2012, 07:25 AM
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switch on the transfer case, electic motor, 4wd module. Get it scanned first to see what codes shes throwin

2002 with 125K. Injectors and HP fuel lines from Lincoln diesel at 113K.
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post #3 of 3 (permalink) Old 07-28-2012, 10:38 AM
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encoder motor sensor

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Originally Posted by chevytrucks94 View Post
its my grandpas truck he called the other day asking me if i could look at his truck the service 4x4 light came on. Its and 02 with around 150k on it with the lb7. Just looking for a few places to start. thanks
start with replacing the encoder motor sensor, I ordered from rock auto around $40, most common fix solved problem
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