Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Hi there, I am Cam. Can I get your first name please? I am not sure if you have used our service before or not. The experts here are third party contractors. Myself, I am a GM technician in a Gm dealership. I will be happy to help you. Please understand that my only compensation for the time spent helping you is by your rating of my service in a positive way. The more information you provide, the better the chances of getting your issue resolved. Also please reply if you have any followup questions. So about your vehicle,
the U codes which are communication codes many say otherwise. Give me a few moments to review the codes and see what we can find.
Ok, so the U1003 and U1009 could be a problem with engine or chassis grounds. I suggest checking those, namely on the frame under the drivers door and the side of the engine.As for the other codes, yes the pressure switch manifold is a possible suspect. What I suggest prior to simply replacing it is to check your wiring and connections at the transmission module on the fan shroud, check the wiring to the round connector making sure there is not too much sideways tension on it. If those don't show issues and the wiring does not look like its damaged, then the pressure switch manifold may be bad. Its easy to replace, dropping the transmission pan and replacing the assembly is as far as that goes.