Two problems related to software have been reported for the 2012 Chevrolet Volt. The most recently reported issues are listed below.
Purchased car 5-31-12-received gm's �19 recall to reprogram hpcm to eliminate ppr some vehicles had. Prior to service no issues. Coolants replaced same time. Service done 11-19-19 by ourisman rockmont @ 141,301~85% ev, with negative impact. Range now to 28~32 miles/chg, 8. 1-8. 3 kwh consumed, prior 36-38 miles/chg 9. 7-9. 9 kwh@60-75f. Eng now runs randomly @ temps btw 40-65f. Called gm,complained assigned case#9-56696768626&taylor@866-790-5600x5916129. Multi msgs b4 call returned. Advice-return to dealer, did on 12-5-19 told car functioning correctly. Called gm voiced discontent w/car since recall service. Told gm relies on dealer techs to determine if car is functioning correctly. Per advisor's rec, took 3rd trip to dealer. Dealer rep stated car was working correctly, said he had complaints from others after recall work, engine running due to low temp, batteries & range deteriorate over time. Requested car be returned pre-recall state, told not an option. Expected battery deterioration from start, didn't expect gm/dealer to break car, causing 2 happen in 1 day. Previously eng ran at 24f w/screen showing running due to temp. No screen now. Car speed drops when engine engages, safety issue on busy roads. Wrote gm 5/20 & dealer 11/2020,no reply. Car driven <6k mi in �20 due to these issues. Don't trust gm/dealer to fix car. Gm sends me to dealer says car performing correctly. Car no longer chrgs, indicates chg system service required. After 2 trips to gm dealer, still not working, told battery may need replacing. If so damage done by gm dealer & gm hpcm2 update. Told in �19 by ourisman rep update fixed battery cell rebalancing issue. Since hpcm2 reprogramming my cars performance fundamentally changed & safety issue when engine engages. Gm should recall vehicles, fix them making owners whole since it is their software & dealer service technicians who created safety issue.
Vehicle dies suddenly while moving, although under full electric charge. Could not restart. Chevy said was software problem and made fix Dec 2018. Just happened again yesterday 2/17. Others reported on Volt blog site. Said wait 5-10 minutes and then restart, which I did and that worked. Concern that loss of power is sudden and without warning. Died in middle of intersection this time but fortunately no cross traffic. This is serious problem -- apparently others have had same issue. Reporting to local chevy dealer at this time.