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Just got back from longer journey. Management light on. Fault code on simple reader S7E9. Seems to be a transmission fault. Has anyone knowledge of any common faults I can check before paying £45 for a garage to tell me a PO code. Thanks in advance
 

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Do you really mean S7E9? A google found me nothing, and I coudn't find a match in the Volt Service Manual 72MB pdf either. DTC codes are usually a letter (P,B,C,U seem common) followed by 3 or 4 digits & letters. Couldn't see any S... ones.
 

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Googling a bit more, suggests $7E9 is a CAN id saying that the Transmission system has detected a fault. So I'd expect a list of other codes, probably a P0100 to begin with, which simply means "some error, see othe codes for details" etc.
 
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