newport937
New member
Hey all!! I am a novice with technical work on vehicles.
I have recently acquired a 2019 Equinox Premier AWD. It supposedly has transmission problems so I took it on as a project. Here's the specs: 2.0 (LTG) engine, 9T50 (M3D) AWD transmission.
I have a complete tablet bidirectional/coding scanner with J2534 passthrough VCI, telemetry, etc., TechLine Connect subscription with SPS2, and a separate VCXnano J2534 passthrough. I also have a toner for looking for wiring issues.
When I got started with it, the AGM battery in it was toast as the car sat for months. After removing the battery a charge "repair mode" it only held 4v. Got a new battery for it, and it started right up. When it got new life, it had all the U DTCs like lost comms to all the modules, low voltage DTCs, etc. Also present was a permanent P0747, solenoid stuck open.
Let it idle for about half an hour. Cleared codes. Test drive indicated the "only 5th gear" symptom, no reverse. I could send command to clear P0747 but it's permanent and will only clear with a successful 6th to 7th gear shift. However, after clearing it would shift from 1 to 5 like normal, then bog down and back to 5 and then remain in 5.
SO, since it is a project and trying to learn more, I wanted to work it step by step. Acquired a new solenoid control body, and replaced it. I pulled the battery, pulled the ECM, pulled the charge pipe, pulled the under hood fuse box (pulled these for top access as well as bottom, this operation was done at home without a lift). I knew I would need to program the part specific number of the solenoid body into the TCM via SPS2. Did a drain and fill in the transmission too.
Herein lies the problem now. While carrying the TCM from workbench to the engine compartment, I dropped it on the floor. I didn't worry too much about it as I had dropped one before and it worked fine afterwards. Once I put everything back together, the vehicle was showing "shift to park" and will crank forever and no start. Then I noticed the sunroof wouldn't close, the interior dome lights don't work (only the one just inside the back hatch illuminates), rear hatch button on the gate itself doesn't open the handsfree lift gate, etc. I start to think, BCM issues too when I didn't even touch that module at all? DTC present for No Communication with TCM. Circuit issue with the wiring? TCM a link in the wiring to BCM from ECM? ECM junk? Got salvage ECM, plugged it in before I knew about Global A system. No start, saw a lot of things were wrong like displayed outdoor temp, immobilizer light, etc. Did some research, found out about Global A, put original ECM back in and this is it's current state.
Schematics look like a foreign language to me most of the time. I plan to start digging/tracing/etc. Also to note, the gear shift selector is in park, stepping on brake to release the gear shifter lock solenoid does nothing.
Part of me first wants to SPS reprogram ECM since I read about the do not swap modules. Then reprogram BCM, then see maybe what to do with TCM if it comes back after programming of ECM/BCM?
Any pointers from anyone? This is a mess but I have time to work through it as this is just a spare project car. I also will welcome any constructive criticism, etc. I can't actually learn with my ego in the way!
Thanks all!
I have recently acquired a 2019 Equinox Premier AWD. It supposedly has transmission problems so I took it on as a project. Here's the specs: 2.0 (LTG) engine, 9T50 (M3D) AWD transmission.
I have a complete tablet bidirectional/coding scanner with J2534 passthrough VCI, telemetry, etc., TechLine Connect subscription with SPS2, and a separate VCXnano J2534 passthrough. I also have a toner for looking for wiring issues.
When I got started with it, the AGM battery in it was toast as the car sat for months. After removing the battery a charge "repair mode" it only held 4v. Got a new battery for it, and it started right up. When it got new life, it had all the U DTCs like lost comms to all the modules, low voltage DTCs, etc. Also present was a permanent P0747, solenoid stuck open.
Let it idle for about half an hour. Cleared codes. Test drive indicated the "only 5th gear" symptom, no reverse. I could send command to clear P0747 but it's permanent and will only clear with a successful 6th to 7th gear shift. However, after clearing it would shift from 1 to 5 like normal, then bog down and back to 5 and then remain in 5.
SO, since it is a project and trying to learn more, I wanted to work it step by step. Acquired a new solenoid control body, and replaced it. I pulled the battery, pulled the ECM, pulled the charge pipe, pulled the under hood fuse box (pulled these for top access as well as bottom, this operation was done at home without a lift). I knew I would need to program the part specific number of the solenoid body into the TCM via SPS2. Did a drain and fill in the transmission too.
Herein lies the problem now. While carrying the TCM from workbench to the engine compartment, I dropped it on the floor. I didn't worry too much about it as I had dropped one before and it worked fine afterwards. Once I put everything back together, the vehicle was showing "shift to park" and will crank forever and no start. Then I noticed the sunroof wouldn't close, the interior dome lights don't work (only the one just inside the back hatch illuminates), rear hatch button on the gate itself doesn't open the handsfree lift gate, etc. I start to think, BCM issues too when I didn't even touch that module at all? DTC present for No Communication with TCM. Circuit issue with the wiring? TCM a link in the wiring to BCM from ECM? ECM junk? Got salvage ECM, plugged it in before I knew about Global A system. No start, saw a lot of things were wrong like displayed outdoor temp, immobilizer light, etc. Did some research, found out about Global A, put original ECM back in and this is it's current state.
Schematics look like a foreign language to me most of the time. I plan to start digging/tracing/etc. Also to note, the gear shift selector is in park, stepping on brake to release the gear shifter lock solenoid does nothing.
Part of me first wants to SPS reprogram ECM since I read about the do not swap modules. Then reprogram BCM, then see maybe what to do with TCM if it comes back after programming of ECM/BCM?
Any pointers from anyone? This is a mess but I have time to work through it as this is just a spare project car. I also will welcome any constructive criticism, etc. I can't actually learn with my ego in the way!
Thanks all!
