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Ampera loss of drive (intermittent)

2128 Views 14 Replies 7 Participants Last post by  modo
Hi there. Just bought a 2014 ampera 80,000miles and full history. It has developed an intermittent loss of drive and only seems to happen at very slow speeds and on slight left hand turns. No warning lights come on and dash stays illuminated as usual. Anyone ever had any issues like this? the car drives excellent besides this.
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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.
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.
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.
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