6/6/2023 0 Comments 2014 chevy volt range forums![]() Hope this helps someone on down the road. The thought behind the permanent codes is that the car has to actually believe that the repairs have been competed, and that everything is back to normal for a full drive cycle, before they'll get removed. After I was pretty sure it was fixed (there were no pending or confirmed codes) but there were still "permanent" codes the scanner wouldn't clear I did get a little knot in my stomach, but actually that's by design. The $5 dongle and the free code clearing apps did just fine. I found this step optional and unnecessary.įinally, you don't have to go to the dealer/auto parts store/have some special reader to clear the codes. Since there are already DTCs about the failed sensor, having the big brain detect them again when you're messing with it isn't going to make more, or worse, codes. I also read several times about being sure to power down the car by undoing the 12V battery connection before playing with it. Hopefully the manufacturer fixed the process and the guts are crimped/soldered better than the old one. Finally, a new sensor is less expensive than some of these aftermarket resistor defeat devices. Plus it's much easier to disconnect the wire connector latch when it's in front of you than trying to do it blindly when everything is still mounted under the reservoir. No tools were required - the sensor just slides towards the front of the vehicle and pops out of the tabs in the reservoir. Not that I'm averse to taking shortcuts, but it's really easy to replace the failed part with the actual part. The reason for the post is mostly to address some misconceptions I read on webs: Took less time than it takes to type about it to snap the new part in.) I have ordered a replacement part "22922224" off of Amazon which hopefully will fix it permanently. After a drive cycle (something like greater than 40 KPH for greater than five minutes) the ECU cleared those codes. While this clears the pending codes, it does not clear the "permanent" codes. I made a resistor out of two 10K's and a 4.7K in series and placed it across the plug, then I cleared the pending codes with a Bluetooth ODB2 adapter and a car scanner app. Yes, it definitely had an intermittent open when jostled. ![]() I pulled the coolant level sensor from the bottom of the reservoir (it just snaps in) and did some troubleshooting. Next day the dealer quoted me $700 to replace the reservoir and sensor stating, "They are a single component and require 4.2 hours of labor to install". Went to pick the car up in the evening and I discovered the message was still on the screen. Took it to the dealer where the technician reported he did the "Reprogram HPCMU2 and BECM" under warranty. 2014 Chevy Volt with the dreaded "Service High Voltage Charging System" error here.
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