Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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Was this the transfer case actuator that broke and how did it break?
Let me know so we can continue,thanks Pete.
O.k.,the one in the front is the front differential actuator.If this actuator broke and shorted internally when it broke this can damage the 4wd control unit/ecu.I have seen this occur before and had to replace the shift control unit to correct this here.The other most common cause is a fault internally with the transfer case actuator located under the center of the vehicle.
What has to be done from here is to have the fault codes read out/checked using a scan tool that will plug in and communicate with all computers in your model.This way you can check the fault codes in the transfer case computer.Once this is done the codes will help diagnose and locate which component is the cause here.I suspect either the transfer case computer needing replaced or the shift actuator on the transfer case under the center of the vehicle.In some cases you can tell it is the actuator on the transfer case by tapping on it to see if it then operates and shifts in.You can also test the signals to it with a multi meter to see if the actuator needs replaced but the codes do need checked as this will help locate if the actuator or the control module is the cause here.
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Since the transfer case was locking before this was replaced there is a chance that a fault code is set in the transfer case computer that may just need to be cleared out to correct this here.IN some cases a code can set disabling the 4wd system until it is cleared out.
It is also still possible that the 4wd/transfer case computer is at fault here.
But you will need to have the fault codes checked/read out to see what codes are set and those codes then diagnosed to help locate and pinpoint the issue here.
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This has to be done with a compatible scan tool that can plug in and communicate with all computers.This usually take a higher end scan tool to do this that most shops or a dealer will have,A local parts store like Auto Zone can usually read out the codes at no charge to you but will not clear out the codes unfortunately.
Were the codes checked with a compatible scan tool that was able to plug in and communicate with the transfer case computer?If this was not done with a fully compatible scan tool then this issue will occur here with no codes being detected.This takes a higher end scan tool to do this as well as the person using the scan tool knowing what their are checking.They need to check the transfer case computer for any codes setting.
The only reason I would see no codes setting is if there is a fault in the transfer case computer itself.This is common where it can fail as just like the other control modules/ecu's in your model they usually will not set a fault code for itself failing.I suspect that the transfer case ecu will need replaced and programmed
If this was one of the actuators or a mechanical fault causing this here then a fault code would have been detected.
Even if it was the control switch this would set off a fault code of B2725 for a fault with the switch itself.And since no codes are set with this issue here this sounds like a fault with the control unit.I would have this tested further to be sure.
I would have the power and ground tested to it as well as the data communications with a compatible scan tool.This usually helps diagnose it at fault here.But this will require a multi meter and fully compatible scan tool.