*SOLVED* 2018 Tahoe P135a help

[ConquerCustom]

I have a 2018 Tahoe with a P135a code. It’s only running on the passenger bank.

I checked all the fuses, they look good. I checked the voltage at the plugs and while running, the far left plug (pin 4) is over 12v the other 3 are grounded.

I unplugged 1 from the passenger bank while it was running and it read the same so I guess the power at the harness is correct?

For funsies, I put my spark test light on and the coils are definitely firing the drivers side.

Now I’m stumped on what to check next.

 

[Joseph Garcia]

Welcome to the Forum from NH.

Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.

I hope that you will become a participating member in the Forum's discussions.

Pics of the truck, please.

I cannot personally assist you with your issue, but other members of this Forum much more knowledgeable than me in this area will chime in.

 

[ConquerCustom]

No one chimed in but I figured I’d drop back in to share the source of the issue.

The ECU failed and was leaving the circuit open for bank 1. So I had a dealership install a new ecu and program it.

 

[Geotrash]

No one chimed in but I figured I’d drop back in to share the source of the issue.

The ECU failed and was leaving the circuit open for bank 1. So I had a dealership install a new ecu and program it.

Thanks for following up with what worked!

 

[OR VietVet]

No one chimed in but I figured I’d drop back in to share the source of the issue.

The ECU failed and was leaving the circuit open for bank 1. So I had a dealership install a new ecu and program it.

Sometimes, when you are a new member, it is best to introduce yourself first, in Introduction, because some members get turned off by a new member only joining to get help.

Then find the correct section and post the problem there, like you did.

Plus, you posted at the start of a holiday weekend.

 

[Tahoe14]

Thanks for the feedback. It may help another member at some point.