GMC Troubleshooting Questions? Ask a Mechanic for Answers
Hi there, I am Cam. Can you tell me what code is set in the transmission module itself? P0700 will be reported in the engine on behalf of the transmission module .
OK, we will need to. However in the absence of the code, we can work on why its shifting hard a bit. Hard shifts are the transmissions response to a slipping condition. It increases pressures to compensate. Anything could be slipping, the Torque Converter Clutch (TCC) , any clutch and it may only be that one lip seal, one sticking valve or something like that is happening and causing it. You replaced the filter, was the magnet still on the external spin on filter?
Ok, do you still have the internal filter? Did you open it up and look for signs or a rubber lip seal, anything more than a small particle?
The signs can be subtle. But if nothing then it's something in the valve body, a binding valve then. Take off the valve body and clean it out. Make sure every one moves with no binding. If any do, you may need to replace the valve body.
that should not cause a hard shifting. That is just for the 4wd system.