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P1621 Diagnostic Trouble Code Discussion for April 2012

Control Module Long Term Memory Performance

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Trouble Ticket Help Requests for DTC P1621
Help Request Posted
2004 GMC Sierra 2500 HD SLE 6.6L No Start VIN: 1GTHK29184
P1621: Control Module Long Term Memory Performance. ... of a diesel mechanic. I have this duramax that wont start. Owner replaced his own fuel filter and after a couple hours driving he noticed lack of power and his fuel pressure was dropping down he could not remember to what (It has a chip). the next morning ...
April 03, 2012