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Tire change then SHVCS

2020 Views 13 Replies 7 Participants Last post by  brentalan
I finally wore down the tires that came with my 2012 volt and got a new set yesterday. I didn't go to the chevy dealer since I figured it was just tires like any other car and it saved me nearly an hour of driving. Last night when my wife was out running errands the Service High Voltage Charging System error showed up and now the car won't charge. Is there anything special that needs to be done when the tires are changed? Has anyone else had this happen to them?
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It looks like the car that had it covered under warranty was a 2013 with under 100k miles, so 5/100 powertrain warranty was likely still in play. That does cover this issue, but the Voltec warranty doesn't cover it.

Here are the relevant threads:

Order WOTs sensor now since it takes a while to arrive.

I just fixed this on my car and explained how in a recent post in the first thread. It's not simple, requires special equipment, and requires computer skills.

If you're going to bring it to the dealer, I highly recommend educating yourself first so that you can tell them exactly what you want done. Otherwise they'll likely not know how to fix it and will spend hours trying to figure it out. You don't want to pay for that. They're going to see a code about a battery isolation issue and want to track that down. It's a false code and you don't want them wasting hours on it. They only need to do the following:

1. Replace battery coolant sensor.
2. Reprogram HPCM2 module, even if SPS says it's up to date. They need to re-apply the same version. That's the only way to clear the special low battery coolant code.
3. Clear all DTCs

If you can convince them to do that, it should only cost you $21 for the sensor and 1-2 hours of labor.
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Got my car fixed. It just needed some software updates. They reprogrammed the battery control module, battery energy control module, and hybrid powertrain control module 2. They said that they already knew what it was when I brought it in because they had two other Volts in for the same thing last week. They tried to charge me $234 saying that software updates are only covered by the bumper to bumper warranty. After an hour of phone calls between us, the service department and GM everyone finally agreed that those particular software updates are covered by the 8 yr 100k battery system warranty. Just wanted to give that heads up to anyone else who has this problem and stumbles across this thread. Maybe it'll save some time, money, and headache.

If they didn't change the battery coolant level sensor, the problem will recur, likely soon. I suggest ordering the WOT sensor to fix the issue permanently.
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