I would suspect an iffy earth somewhere, or possibly even a software fault.
Measure voltages with the +ve on the main feed box, and the -ve on the engine block
The software fault may be resolved if there is a new update for the car so ask at the next service.
(they may even have a TSB - technical service bulletin - for the issue)
Last edited by: Zero on Wed 2 Mar 11 at 20:18
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