I have a year 2000 Blazer 4WD with RPO NP8 - 4WD push buttons do not work - the indicator lights flash but no noise of engagement occurs.

I have replaced TCCM, no joy

Which TC is fitted to my truck and what would be the best thing to look at repairing/replacing next??

Thanks

Malcolm

 

Have you checked the actuator under the battery and the solenoid on the firewall? Also, look over all of the vaccum lines for any tears or holes.

 

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