Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay.
Was the 4wd push button switch itself replaced?
Let me know so we can continue,thanks Pete.
O.k.,on this year the switch was the most common cause for the lights lighting up in both 4low and 4high positions but one common issue was the actuator on the transfer case would short out and cause a short in the 4wd computer causing the computer to fail as well.If the computer was to be replaced before the actuator was replaced this would damage the new computer instantly to where it would need replaced again after the actuator on the transfer case is replaced.I just want to make sure you know this for now and future reference on this model and to make sure your actuator is o.k.
Below is a diagnostic procedure to test the switch control and TCCM operation to help identify that the switch is the cause here (I suspect it is since everything else is either o.k. or has been replaced).
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