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Service 4WD came on? [Archive] - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

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04MaroonTB
04-19-2007, 03:50 PM
On my way home from work the other day I looked down at the dash and noticed my Service 4WD light was on. Then I looked at the switch and there was no light illuminated and no function from switching from 2wheel to 4wheel.
I didn't want to stop until I got to the dealership in case it goes off.

I was thinking they would of kept it overnight but they told me to wait until they pull the codes. In 30 minutes they came back and told me that they reflashed the computer, test drove it and everything is fine so I was on my way.

Has anyone had this problem before and what was the outcome? The service advisor left before I could ask him if there was a TSB on it.

PROSPHOTO
04-19-2007, 04:08 PM
There is a bulletin for the concern you mentioned aith code #C0550 stored. After diagnosis, a Transfer case control module re-flash/reprogram is the correction :yes: