Not starting.

[Doubeleive]

Hooked my scanner up and looks like I may have a bad bcm. Engine, trans, and abs systems have a U0140 Lost communication with body control module. It’s showing it in history and current. I was pulling fuses so seeing how it’s current and they’re all back in and were good I’m thinking it’s a bcm issue.

further evidence of a power problem, not indicative of a bad bcm
get a meter out and start checking voltages/grounds
start at the battery and work your way out section by section

 

[newjonwayne]

Listen to what people here are telling you.

This for sure sounds like a broken/bad ground cable. You can check by putting the black side of a set of jumper cables from the negative post to the engine block.

Cleaned up all the grounds I could find under the hood and bypassed the ground with jumper cables and still nothing. Tomorrow I’m taking the intake back off to make sure I haven’t pinched something.

 

[newjonwayne]

Had 2 friends help me look for a ground problem and nothing so today went to a wrecking yard and got a used bcm. Fired right up but now my air bag light is on and a new engine code popped up, crankshaft variation not learned

 

[wjburken]

Had 2 friends help me look for a ground problem and nothing so today went to a wrecking yard and got a used bcm. Fired right up but now my air bag light is on and a new engine code popped up, crankshaft variation not learned

Just for kicks, I’d put your other BCM back in and see what happens.

 

[j91z28d1]

Had 2 friends help me look for a ground problem and nothing so today went to a wrecking yard and got a used bcm. Fired right up but now my air bag light is on and a new engine code popped up, crankshaft variation not learned

that's wild.. I would love to know what killed the bcm.


the new one probably needs flashed to the car. few different ways to do it.

 

[newjonwayne]

that's wild.. I would love to know what killed the bcm.


the new one probably needs flashed to the car. few different ways to do it.

My thinking is it was bad before I ever started working on it. Was just waiting for no voltage to finally let go. I haven’t had any weird symptoms from it before but I definitely didn’t short anything while taking the negative off and back on. I’ve seen a couple vids of the same symptom but no cause.

And way to do it besides a dealer?

 

[newjonwayne]

Just for kicks, I’d put your other BCM back in and see what happens.

TBH I’m kinda curious myself. I don’t think it’ll fix the no start but I wonder if the airbag and extra faults I didn’t have before go away. Oh and my radio says locked and automatic lights no longer work but that’s programming most likely.

 

[Doubeleive]

My thinking is it was bad before I ever started working on it. Was just waiting for no voltage to finally let go. I haven’t had any weird symptoms from it before but I definitely didn’t short anything while taking the negative off and back on. I’ve seen a couple vids of the same symptom but no cause.

And way to do it besides a dealer?

you could program it yourself with techline connect/sps but you need a windows 10 pc/laptop and a mdi2, a mdi2 clone runs around $200 or so, maybe a little more. The programming fee is $45 for 2 years of programming. only for 1 vin.