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I'm going to close this out with a final update. Next suspect was a connection on the engine fuse block. I briefly got back interior lights as I fiddled with connectors. But I did so with the box not installed. Thinking I had one problem solved, I disconnected the use block, installed the box...

PEBKAC error. I didn't have a connector properly seated on the main fuse block and that resulted in the engine control module and trans control module not getting power. So now I have (or had) power to both and could read them on my scan tool. Apparently however when I bought a new key and...

I'll just log my progress. Yesterday I went through some mostly futile diagnostic exercises because I was running out of ideas. I tried swapping back in my dashboard harness to see if anything was different. It didn't really change much, but in the process I discovered one connector I missed on...

Further update. The engine control module and either the rear axle module (on AWD vehicles) or a diagnostic link resister (on FWD vehicles) provide 120 ohms resistance each at either end of the CAN network, and at the diagnostic test connector you should get 60 ohms as a result of the two...

Update. I resolved the no power situation. The middle connector for the engine compartment fuse block wasn't fully seated. Now I'm down to the nocrank nostart issue and my scanners are not able to communicate. I do have an ecu and bcm from another vehicle if I can figure out how to...

Negative cable connected, positive cable disconnected, so the positive terminal contacted the metal case of the ECU and had a path through ground to the negative battery terminal. I was doing something in the engine compartment and knocked the ECU off of whatever it was sitting on - probably the...

For what it's worth, I did a head gasket replacement on my car and the heater core was blocked, I flushed the heater core and then the heat worked, I was originally vacuum filling the system... as part of the project I replaced the water pump and I had a couple of the screws I didn't tighten and...

Hello everybody. A few weeks ago I bought a 2009 Equinox mechanics special. When I went to the dealership who was selling the vehicle wholesale, the sales guy had the car started when I got there and it was overheating. A quick oil cap inspection showed a likely bad head gasket. I got a discount...