Service 4wd light

Fergy04 · February 23, 2017

Need help bought a 2005 Suburban Z71 service 4wd light on and is stuck in 4wd auto. Tested dash switch found it was bad replaced switch still have same problem so replaced encoder motor with delco encoder motor ,when tested dash switch light up as transfere case in neutral pressed dash button to turn motor to auto to install light just flashes and encoder motor doesn't turn , So replaced the TCCM still has same problem. It is a aftermarket TCCM so came preprogrammed. Pulled trec fuse with old encoder motor installed and could here axle actuator motor working but that's it any help would be appreciated.

kstruckcountry · February 23, 2017

Needs to be scanned

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Knotsure · February 23, 2017

When changing the encoder motor, does that include the encoder motor sensor? I guess it would right. I had service 4wd issues and found it was that little donut sensor. Just checking, good luck.

2014 Chevy silverado Z71 DCSB w/Bilstein 5100 level

Fergy04 · February 23, 2017

Yes the new unit included the sensor, Just seems strange that with all parts changed there is communication between the dash switch and the encoder motor because it will show the position of the encoder motor but will not change it ? As for scanning it $100 for scan $130 for replacement harness which is only part that hasn't been changed? Tough call on that one thanks for the replies.

GMCustomerService · March 16, 2017

^{Hi Fergy04,}

^{We can see that you are seeking the input of other forum members, so we would like to offer our assistance as well. If you would like for us to take a further look at your situation, please know we are only a private message away. Our team would be more than happy to assist any way that we can.}

^{Thank you,}

^{Bret B.}

^{GM Customer Care}