07 Suburban 167,000 miles.
Trying to diagnose a 4WD issue, any help would be great. Turn the dial to 4HI or 4LO and the light flashes for ~20secs then back to 2WD. Front differential actuator clicks on when you turn the dial and then again when the light goes back to 2WD. No sound from the Transfer Case Motor. Replaced the motor but no change. Not receiving any service 4x4 info on the DIC or other CEL's. Turning it to Auto works, but I don't think it's actually engaging anything, my understanding is the T case doesn't engage until it senses slip for Auto. Can't get into N either.
I'm leaning TCCM at this point, but not sure if a failed TCCM would give me some sort of code or dash light.
Any thoughts?
Thanks.
-Svence
Trying to diagnose a 4WD issue, any help would be great. Turn the dial to 4HI or 4LO and the light flashes for ~20secs then back to 2WD. Front differential actuator clicks on when you turn the dial and then again when the light goes back to 2WD. No sound from the Transfer Case Motor. Replaced the motor but no change. Not receiving any service 4x4 info on the DIC or other CEL's. Turning it to Auto works, but I don't think it's actually engaging anything, my understanding is the T case doesn't engage until it senses slip for Auto. Can't get into N either.
I'm leaning TCCM at this point, but not sure if a failed TCCM would give me some sort of code or dash light.
Any thoughts?
Thanks.
-Svence
