Chevy Bolt EV Forum banner
  • Hey Guest, welcome to ChevyBolt.org. We encourage you to register to engage in conversations about your Bolt.

Service Indicator Comes On Early?

19K views 17 replies 11 participants last post by  XJ12 
The service indicator came on yesterday and stayed on for my few trips. Today it didn't come on. I am barely over 4900 miles so not even near the first servicing time. My dash just said service was due soon.

Has anyone else had this happen? Otherwise my Bolt is driving fine.
Yes - my Service Engine Soon light has come on twice now, the first time after about 30 days (April 2017) at 1,800 miles and then again
on 10/23/17 at 10,700 miles. Both times there were no known visible issues, the car ran fine and all the controls
were functional.

Both times I dropped the car off at the dealer, they ran diagnostics, updated and/or reprogrammed the HPCM2 (Hybrid/EV Powertrain Control Module 2),
whatever all that means, and I was back on the road.

Codes:
1st time: U18A4 - Lost communication with Hybrid/EV Battery DC Charging Communications Gateway Module
2nd time: P3021 - Hybrid/EV Battery DC Charging Negative Voltage Sensor Stuck Low

Hopefully this is the worst I'll experience...
 
Thanks for adding your personal experience to the forum/knowledge base.

So after the service light went away and "the car ran fine and all the controls were functional", how long from then to your service dept visit? I have a service dept visit scheduled a week from now and am worried the error codes will go away. When your Bolt returned to normal, did the service light go away as well?
My Service Engine light stayed on until the dealer visit, which was 5-6 days after the 1st time the light came on, and one day after the 2nd.
Even if the light was to go out, the codes will stay in memory until they are explicitly erased by the dealer.
 
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top