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Discussion Starter · #1 ·
Im wondering if anyone has any solutions to the P1638 code on a 2002 Tahoe. My battery light keeps flashing at random intervals ever since my alternator went out and every once in awhile it will go into a sort of limp mode and wont accelerate above 2,000 RPM. It is the only code it throws and I cant help but to think it must be related in some way because I know it has to do with the PCM sometimes. Any help would be greatly appreciated, thanks!
 

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Sounds like you have a new alternator and still have the problem.

If that's the case, look for a problem with the alternator wiring and check all grounds.
 
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