When the car was in for the 12 v battery check (after throwing a hissy fit but still driveable), MOT and Lifetime Warranty inspection one of the codes pulled back was P079C which, from Googling, I found this, basically, Transmission Clutch 3 Slip Detected. The tech at the garage had seen this before and did a transmission oil change which cured the problem. Hopefully that will cure it. Reading elsewhere it appears that the Volt has a transmission oil change recommended at 97,500 miles to I am 10k early. Cost was:-
£90.00 - Labour (assume 1 hour?)
£20.10 - Transmission oil 2 units
£50.25 - Transmission oil 5 units
+ VAT total £192.42
£90.00 - Labour (assume 1 hour?)
£20.10 - Transmission oil 2 units
£50.25 - Transmission oil 5 units
+ VAT total £192.42