[jimhewson]

2017 Volt 2 weeks old with 1100 Kilometers (Canada). Car operation had been normal. After coming to a stop car would only move about 1 foot. Check engine light on. Car towed to dealer. Dealer advised that GM was sending a new transmission. 16 days later car is repaired. The work order shows 3 codes:
P079A--00--Transmission Clutch 1 Slip Detected
P079B--00--Transmission Clutch 2 Slip Detected
P0AC4--00--Hybrid Powertrain Control Module Request MIL
The dealer gave us a loaner Volt to drive during the repair.
After all this I can't believe I still really like the Volt.

 

[jimhewson]

Last 6 digits of VIN is 129406 date of manufacture 8/16

 

[jimhewson]

I wonder what it counts as a "clutch slip". Sometimes after I stop, my car will jerk a bit the next time I accelerate. It feels like it starts to take off, then jerks into what feels like Neutral for just a split second, then snaps back into acceleration.

When this happens in CS mode, it's far more exaggerated...one time I started to take off and it jerked mildly a couple times and then completely stopped accelerating for about a full second until it started the engine and then everything was fine. This has never thrown any codes though, and it doesn't happen very often...did yours do anything like this?

I do recall similar "jerk a bit" symptoms a few times previous to the final break down. I thought it may have been wheel slippage on wet road. The loaner Volt never had any "clutch slip" for the 16 days we drove it. So far the new transmission is working perfectly.

 

[jimhewson]

I also received an extended warranty from GM. So far, after 21,000 kilometers, the car has had zero issues.