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Re: bad electrical failure (08 Z06)
There's a good chance it's the alternator. At high rpm the internal fan blades can come in contact with the windings, resulting in the signs you described.
Although the following TSB was issued for '07 cars, some '08 cars are experiencing this issue as well.
The fix is a new alternator. At the time the following TSB was issued, the new alternators had a different part number (15841234), although that may have since been superceded.
The difference being, the new units have a clutch which prevents the alternator from attaining excessive rpm and in turn resulting in the internal fan coming in contact with the windings. This was a fix for '08, but not all cars have them depending on build date.
Lastly, OnStar will not always be able to 'see' every code and may only be able to see codes that cause the CEL to illuminate.
Subject: Service Charging System P0621 DTC Stored - keywords alternator battery charge dic generator gauge light
low ls2 ls7 voltage #PIC4402A - (04/11/2007)
Models: 2007 Chevrolet Corvette
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This PI Supercedes To Include Looking For Short On Generator Bracket. Please Discard PIC4402.
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The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Some customers may comment of a "Service Charging System", "Service Electrical System" and/or a "Battery Voltage Low" message on the DIC accompanied by DTC P0621 in the PCM. This may be the result of a shorted wire on the generator bracket or a cut in the stator winding that is caused from high engine RPM, usually because the engine hit the rev limiter. The internal fan is flexing and when it does flex, it comes into contact with the winding. A new generator may do the same thing if the engine is placed against the rev limiter.
Recommendation/Instructions:
Inspect circuit 225 for a short to ground on the generator support bracket, where indicated in the picture below. If no wire concerns are found, replace the generator with current SPO stock.
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Last edited by No Doubt : 04-12-2008 at 12:57 AM.
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Linear Mode
