S-VCM question (RDX)
 

Had a check engine light on my 2016 RDX (asking here, as the RDX board is nearly dead). Installed the S-VCM II over a year ago (out of warranty). Recently got a CEL P0118 coolant sensor high, and a P0128 coolant below threshold. Removed the S-VCM, checked the sensor resistance (within spec) and cleared the codes.

Sent a message to the manufacturer (two weeks) no answer to date. Wondering if anyone else has had a failure of the S-VCM II module, and if there is any troubleshooting possible? I did monitor coolant temperature when it threw the code, bypass in place. I was reading 154 deg F consistently, as opposed to 167 deg F published by the mfg.

Considering putting it back in and watching it. If it still sets the code, will likely replace it, as the car runs great without the VCM activating!

Thoughts appreciated.

If you can change the resistance amount, try lowering it. Otherwise, it's probably just a one-off due to hot weather, so you can just put it back and see if it throws the code again.

I use the VCM muzzler and I sometimes have to adjust the resistance value based on winter / summer.