I really appreciate you taking the time to look, it means a lot! I looked through those pages and it seems to come back around to ignition coil 1. It's so new that a bad coil seemed unlikely, but not impossible. I've replaced all of them and the spark plugs too, but no change. It would have cost 1180 at a dealership if it was the ignition coil(s), so I thought replacing them myself would have been cheaper. Unfortunately, that doesn't seem to be the problem.OBD-II says it is a manufacturers code. I found this at their site:
Also this:
P135A Engine Trouble Code - P135A OBD-II Diagnostic Powertrain (P) Trouble Code Engine OBD Code | EngineTroubleCode.com
P135A OBD-II Diagnostic Powertrain (P) Trouble Code information page. when your car's 'P135A Check Engine' light comes on, it's usually accompanied by a sinking fee...p135a.enginetroublecode.com
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What does DTC Code P135A mean on a 2012 Chevy Equinox?
Hi: My 2012 Chevy Equinox does not start; using an OBD-ii reader, I found that the DTC code corresponding to the Check Engine Light that comes on is P135A (followed by a weird 1/3 fraction!). I think somebody has been tampering with my ignition >:. What does this fault code mean? Thanks much...www.terrainforum.net
.Chevrolet Traverse Questions - What does the code p135b mean or indicate on a Chevy Traverse 2012? - CarGurus
What does the code p135b mean or indicate on a Chevy Traverse 2012? - ^ title says it allwww.cargurus.com
Hopefully something in those will help you.