BADASS of New England

An automobile club for the enthusiast who enjoys the last of the big GM cars. The rear wheel drive B and D bodys. Chevrolet Impala SS, Caprice, 9C1, Buick Roadmaster, Oldsmobile Custom Cruiser, Cadillac Fleetwood
 
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 2004 Tahoe 4WD Service Light

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bladerunner



Posts : 212
Join date : 2012-07-16
Location : Maine

PostSubject: 2004 Tahoe 4WD Service Light   Mon Jan 06, 2014 1:08 pm

With all the snow we have been running our Tahoe in 4WD quite a bit. The 4WD service light came on today (wife called me, so I have yet to run for any codes or even look at the problem). The dash still indicates truck is in 4WD Auto, so I would assume the selector switch on the dash is good. From here, what is the best way to determine if the problem is the encoder motor or transfer case control module?
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V8Killer



Posts : 1691
Join date : 2009-03-12
Age : 45
Location : Southern, NH

PostSubject: Re: 2004 Tahoe 4WD Service Light   Mon Jan 06, 2014 2:27 pm

bladerunner wrote:
With all the snow we have been running our Tahoe in 4WD quite a bit. The 4WD service light came on today (wife called me, so I have yet to run for any codes or even look at the problem).  The dash still indicates truck is in 4WD Auto, so I would assume the selector switch on the dash is good. From here, what is the best way to determine if the problem is the encoder motor or transfer case control module?

You need to scan the TCCM with a Tech-2.

If the light came on there will be codes.
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bladerunner



Posts : 212
Join date : 2012-07-16
Location : Maine

PostSubject: Re: 2004 Tahoe 4WD Service Light   Mon Jan 06, 2014 2:31 pm

V8Killer wrote:
bladerunner wrote:
With all the snow we have been running our Tahoe in 4WD quite a bit. The 4WD service light came on today (wife called me, so I have yet to run for any codes or even look at the problem).  The dash still indicates truck is in 4WD Auto, so I would assume the selector switch on the dash is good. From here, what is the best way to determine if the problem is the encoder motor or transfer case control module?

You need to scan the TCCM with a Tech-2.

If the light came on there will be codes.

I was afraid of that. I only have a reader for OBD. How about the encoder motor sensor as the possible issue? I have read that if you have the 4WD service light with C0327 code it might be worth replacing the sensor (part #88962315) before just going with the entire motor.
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V8Killer



Posts : 1691
Join date : 2009-03-12
Age : 45
Location : Southern, NH

PostSubject: Re: 2004 Tahoe 4WD Service Light   Mon Jan 06, 2014 4:00 pm

bladerunner wrote:
V8Killer wrote:
bladerunner wrote:
With all the snow we have been running our Tahoe in 4WD quite a bit. The 4WD service light came on today (wife called me, so I have yet to run for any codes or even look at the problem).  The dash still indicates truck is in 4WD Auto, so I would assume the selector switch on the dash is good. From here, what is the best way to determine if the problem is the encoder motor or transfer case control module?

You need to scan the TCCM with a Tech-2.

If the light came on there will be codes.

I was afraid of that. I only have a reader for OBD. How about the encoder motor sensor as the possible issue? I have read that if you have the 4WD service light with C0327 code it might be worth replacing the sensor (part #88962315) before just going with the entire motor.

If it does have a C0327, just put an encoder mtr in it.

GM came up with with replacing just the sensor as a half-ass repair bulletin to save money. Works about 25% of the time  Rolling Eyes
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bladerunner



Posts : 212
Join date : 2012-07-16
Location : Maine

PostSubject: Re: 2004 Tahoe 4WD Service Light   Mon Jan 06, 2014 4:09 pm

Thanks for the advice. I will see what codes it has...

Aftermarket encoder motor is $250. AC Delco is $370. I usually go with OEM if I can, but $$$ is tight. Worth it?
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V8Killer



Posts : 1691
Join date : 2009-03-12
Age : 45
Location : Southern, NH

PostSubject: Re: 2004 Tahoe 4WD Service Light   Tue Jan 07, 2014 8:33 am

bladerunner wrote:
Thanks for the advice. I will see what codes it has...

Aftermarket encoder motor is $250. AC Delco is $370. I usually go with OEM if I can, but $$$ is tight. Worth it?
 
I've had good luck with the aftermarket ones.  Smile 
 
Installation note:  DO NOT PLUG THE ENCODER MOTOR IN WITHOUT IT BEING BOLTED TO THE T-CASE!! IT WILL RUIN IT INSTANTLY!
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bladerunner



Posts : 212
Join date : 2012-07-16
Location : Maine

PostSubject: Re: 2004 Tahoe 4WD Service Light   Tue Jan 07, 2014 11:13 am

V8Killer wrote:
bladerunner wrote:
Thanks for the advice. I will see what codes it has...

Aftermarket encoder motor is $250. AC Delco is $370. I usually go with OEM if I can, but $$$ is tight. Worth it?
 
I've had good luck with the aftermarket ones.  Smile 
 
Installation note:  DO NOT PLUG THE ENCODER MOTOR IN WITHOUT IT BEING BOLTED TO THE T-CASE!! IT WILL RUIN IT INSTANTLY!

Local Chevy dealer is doing remanufactured encoder motors for $180. Parts guy says they have been having good luck with them so much that he recommended it over a new one.
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PostSubject: Re: 2004 Tahoe 4WD Service Light   Today at 6:16 pm

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2004 Tahoe 4WD Service Light
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