P135A - Ignition Coil Supply Voltage Circuit Bank 1.

[gs_scott]

Has anyone ran into this code? I have checked all of the ignition fuses. Unplugged all coils to confirm they give a code but no luck.

Thanks,

 

[Fless]

Welcome to TYF. Consider introducing yourself in the Introduction forum, and perhaps put some vehicle info in your signature so we know what you drive.

Bank 1 is the driver's side of the engine, so remove and inspect all of the connections for the coils, not just on the coils themselves.

I know that the Traverses had a connector issue like this for a year or two; other informed people will probably chime in with suggestions.

 

[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.

You are already receiving sage advice from the knowledgeable folks on this Forum.

I cannot personally help you with your question; however, other members on this Forum that are much more knowledgeable than me will chime in.

 

[gs_scott]

I figured out the issue... The coil packs did not have voltage on bank 1 (outside pins on connectors). I started the car and verified voltage on bank 2 and compared to bank 1. It ran pretty rough on 3 cylinders but remained running. The under hood fuse panel has very poor descriptions. Bank 1 is powered from fuse 88 (mine was blown). Bank 2 powers from fuse 89. These are labeled as injector fuses (odd and even).

 

[azolivas]

P135B is the code I am currently getting on my 2017 Traverse.

 

[ReaperHWK]

P135B is the code I am currently getting on my 2017 Traverse.

Thats Bank 2. CHeck the bank 2 fuse first. THen I'd check for voltage on the connectors of each coil connector on bank 2. You can get the wiring diagram with the Haynes manual, for which 2 wires you need to meter out.

If there's no voltage there you need to inspect the wiring between the connectors and the fuse, there is either a break or short there. If you have voltage make sure it's within spec(if not could be wiring issue as well).

If the voltage is within spec with the connector disconnected but you still have an issue with the coils connected, I'd meter the voltage with them connected (see if you can get a lead into the back of the connector or use a pierce style clamp probe) to see if a bad coil is internally shorted and replace.