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GMC Forum: P0335 - Possible PCM problem?
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Old 05-27-2018, 03:04 PM
baskervi baskervi is offline
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Default P0335 - Possible PCM problem?

I'm not quite sure what to try now. We were having both P0335 for CKP position sensor and P0341 for CMP position sensor about 6 months ago. I was unable to figure out the problem, so I took it into the dealership, and they replaced the engine mount. I was pretty sure at the time this wasn't going to fix the problem, but it ran fine until a month ago, when the P0335 started showing up again (and a lot). I ended up turning the engine by hand until I have two full passes of both the high/low signals for both the CKP and CMP sensors, and that looked good. Both sensors have been replaced by both O'Reilly sensors, and both of these have been replaced by the genuine GM sensors. Same problem with all of these. P0341 is no longer showing up, but P0335 is. This is often times followed by a Stabilitrak lamp and the SUV goes into reduced power mode. This may happen 3x in 10 minutes, or it may go a day or 2 between episodes.

This morning, I unwrapped the wiring from the PCM to the CMP sensor, and so far I've not found a break or short. I'm planning on unwrapping all the way back to the CKP sensor. I've gently flexed the 6 wires that go to these sensors using the continuity tone generator. The tone never wavered. I had the sensor end shorted and put the multimeter on the PCM connector. I feel pretty sure it's either a connector problem or a problem with the PCM - I'm not up to attempting a connector replacement, so I'm thinking of trying a new PCM. I'm also planning on running new CMP and CKP sensor wires during the rebundling process. Any ideas of what else I can try?

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