Update on the door control problem. Did some research and testing and figured out there is a broken wire in the harness where the door hinges. With the door closed everything works but when it’s open it doesn’t work. Wiggle test confirms that I can make it work with the door open. So if the door is open with the truck running it loses connection with the BCM and sets the code. Now I have to get it apart and fixed.
HVAC fault codes question.
- Thread starter gregsmy
- Start date
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Not hard to access. The rubber boot disconnects at the jam area from a plastic collar. Pull off and pull back. If you need the boot off, you can pull it from either side or access where the harness goes thru the hole to under the dash and unplug the harnesses and feed back thru the hole and then pull the boot off for complete access.
Next update for the HVAC codes / problem. I got the new evap sensor and worked on installing it. Found a rubber plug that fit a 1-3/4" hole. So I used a holesaw and carefully opened up the evaporator case. Was able to pry the old sensor out. Next I made a loop with some string and cinched it around the connector up top. Was able to reach the topside just by removing the glovebox. After pushing the grommet and connector thru the hole I was able to fish the assembly out the hole I made. Move the string over to the new connector end so I could pull it back up and thru the top hole. After a fair bit of maneuvering I was able to get the sensor back into the evaporator. This seem to have solved the freezing up problem and the evap temperature now reads correctly.
Felt like my luck was good so I tore the door wiring apart in the hinge area. Found one wire that was basically broken in half and after wiggling it once it fell apart. Was able to repair that and get it back together without incidence. That solved the code for lost communication with door control and the problem of nothing working when the door was open.
Felt like my luck was good so I tore the door wiring apart in the hinge area. Found one wire that was basically broken in half and after wiggling it once it fell apart. Was able to repair that and get it back together without incidence. That solved the code for lost communication with door control and the problem of nothing working when the door was open.
Nice work!
So the evap temp sensor definitely solved the problem. If I didnt have the scan tool to see what temperature it was reading, I am sure I would have wasted a lot of time and effort with the refrigerant side of things. This is because it presented as being low on freon or a clogged fixed orifice.
As to the crazy oil pressure readings, I worked on that as well. I got the truck from friends that kept it up and had all of the service records. Thats where I found that they had the original pressure sensor replaced at a independent shop and they used a NAPA brand part. From all my research I decided I should replace it with a genuine Chevrolet part, which is what I did. I saved the "old" sensor in the bag that the OEM came in. So I swapped out the sensors the other day and verified the screen was clean. That seems to have solved the oil pressure problem and I havent got a code back in over a week. Honestly after seeing multiple threads of people having the GM part fail in less than a year, I dont think I have much faith that its any better than a name brand replacement.
The only codes I have left are the ECU and cellular antenna. I am fairly sure the ECU code is due to the tuner deleting the AFM. As to the cellular antenna I think I was wearing my tin foil hat at some point while repairing the truck. I had the complete dash apart repairing the cracked parts and I think I disconnected the antenna so they couldn't track me! Either way these 2 codes havent affected how it operates and I am just going to leave them alone.
As to the crazy oil pressure readings, I worked on that as well. I got the truck from friends that kept it up and had all of the service records. Thats where I found that they had the original pressure sensor replaced at a independent shop and they used a NAPA brand part. From all my research I decided I should replace it with a genuine Chevrolet part, which is what I did. I saved the "old" sensor in the bag that the OEM came in. So I swapped out the sensors the other day and verified the screen was clean. That seems to have solved the oil pressure problem and I havent got a code back in over a week. Honestly after seeing multiple threads of people having the GM part fail in less than a year, I dont think I have much faith that its any better than a name brand replacement.
The only codes I have left are the ECU and cellular antenna. I am fairly sure the ECU code is due to the tuner deleting the AFM. As to the cellular antenna I think I was wearing my tin foil hat at some point while repairing the truck. I had the complete dash apart repairing the cracked parts and I think I disconnected the antenna so they couldn't track me! Either way these 2 codes havent affected how it operates and I am just going to leave them alone.
Forgot to mention that the oil pressure sensor had a small amount of oil inside the connector area. It seems like it leaked past the connector pins, so I cleaned out the connector. The used NAPA one I put back in was dry and am sure it was dry when I removed it before.
