Ampera loss of drive (intermittent)

Hi Andy, it feels like a faulty pedal sensor. The just looses all throttle response and then just takes of again in a few seconds. Happened 3 days in a row now and always in normal driving mode. Just curious if there is a common problem. I'm a trained technician myself and know how hard these intermittent faults can be to find. Thanks.

It happened when I bought the car and had 4 very good matching tyres and it also happened again with 4 new tyres fitted. I would be quite confident that it's not a tyre issue on my car. The best way to describe the fault is as if the throttle pedal has a bad track in the potentiometer,loss of drive then just comes back again. Very dangerous when pulling away from a junction.

HandyAndy said:

Do you have the Volt Service Manual? Appx 75 Mbyte PDF? This has diagrams of where the bits are located, how to swap them out etc. I have no idea if it's resistive (could wear out thx to friction), inductive, capacitative, Hall-effect, or what. But it might be worth finding the connectors and giving them a dose of switch-cleaner fluid & re-seating them. and dosing the pedal as well, if you think it's safe to! Msg me if you want the pdf, I can put it up on dropbox for you.

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Hi Andy, that volt service manual would be great to have. If you could send me a copy would be much appreciated.
07921760250 or [email protected]

1- it happens on different mid light and full throttle.
2-only seems to happen in D mode as this is my preferred mode to use.
3-never happened in reverse (yet)
4- never tried traction control off, but never have any warning lights come on.
5-happpens in a straight line occasionally but mainly on slight left hand turn. And at a variety of speeds.
6- can't get it to replicate it just happens randomly.
I have since noticed that the D light goes out on the shift lever and the dash display so possibly a shift lever fault??

There are also 4 new tyre fitted so I can rule that out also, and it was doing it before they where changed. Had it on a scan tool and no faults at all in any module. I've been a mechanic for the last 24 years and was a vauxhall tech for 8 of those and I know how difficult an intermittent fault can be to find. I'll try it TC off and see what happens. Thanks.