#2016 Chevy Equinox 2.4l Ecotec Gas AWD: No start after engine swap.

21 messages · Page 1 of 1 (latest)

slow vigil
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Me and my dad (Mechanic basically since birth) rebuilt a 2.4l Ecotec for my 2016 Equinox. Rebuilt basically from Block up.

Got everything rebuilt, did the swap.

Engine is primed. Go to start it, no start. We have turn over, starter is engaging, won't fire.

We have fuel, we have oil pressure, we have compression. Scanner shows 2 codes U0121 and U1814. Which leans towards a bad ground and/or a bad BCM. All electronics work as far as we can tell.

Could the BCM fault be causing the engine to not fire? We're at a complete loss. After banging our heads rebuilding this and fully swapping it in, and fixing even more shit along the way...we're just burnt out and at a loss. With pops getting older, sometimes his brain doesn't work like it needs to and we miss stupid shit. That's why I'm here

As far as I can tell, and please feel free to tell me I'm wrong, if the BCM was fully fried, we'd lose electronics (Windows, ignition, security system, etc) and the vehicle wouldn't even turn over because it wouldn't recognize the key.

Is there a sure fire way to "Reset" the BCM in a 2016 equinox. I've read that pulling both leads off the battery, touching them together to discharge (NOT TOUCHING THE BATTERY POSTS) and then pulling all 8 BCM fuses for a couple minutes can "Reset" the BCM without losing programming because the BCM is non volatile.

any help/insight on anything we may be missing would be greatly appreciated

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Edit: Forgot to add information. My apologies:

We had it parked in the garage before the swap. Went to go start it to put it on the trailer to bring it to the shop to start the swap, had ABS Light, "Service Stabilitrak", "Service Power Steering" and no power steering in the vehicle.

I did have a charger on it and we did try to jump it. I have a suspicion that could have fried the BCM before we even started all of this.

slow vigil
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👍

opaque berry
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The reset as you described is a perfect place to start. I’ll look through some doco tomorrow if I can find some pinpoint tests for you

slow vigil
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Reset didn't work. Same codes. Same dash warnings

slow vigil
opaque berry
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This is connector x4 at the k9 BCM, you want to test for infinite resistance between pin 22 and a ground. What you’re looking for is to confirm a short in that circuit.

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Pardon me - first, you want to rule out the other components on that circuit. You will be, in order, disconnecting one, then scanning to see if U1814 goes from “active” or “current” to “historic”. Disconnect the Engine control module, then automatic transmission assembly, then the fuel pump driver control module. After all theee three, assuming u1814 does not become “historic” then do the infinite ground test on the above circuit

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If the code never becomes historic when you sequentially disconnect the above devices and there is infinite resistance on pin 22 of the connector, the BCM is shot. Replacement appears to require dealer programming.

slow vigil
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"then automatic transmission assembly"

Meaning pull out the transmission?

regal boltBOT
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opaque berry
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Just disconnecting the connector from the transmission control unit assembly . Give me few moments

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Connector for engine control module

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Connector for transmission control module

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Connector for fuel pump control module

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slow vigil
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So, update. I brought it to a local mechanic here. Really good guy, knows what he's doing.

Surprise for me, we actually don't have any compression...on all 4 cylinders

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So, timing is most likely off. And if it is, because it's an interference engine, there's a chance we bent valves

opaque berry
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Damn. I was thinking a faulty BCM was the worst case scenario. Sorry to hear that!

slow vigil
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Oh, the BCM is still faulty, mechanic confirmed that.

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Just now we have bigger fish than just a faulty BCM