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P1621 Diagnostic Trouble Code Discussion for March 2008

Control Module Long Term Memory Performance

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Trouble Ticket Help Requests for DTC P1621
Help Request Posted
2003 Chevrolet Silverado 2500 HD 6.6L No Start, MIL Lamp on VIN: 1GCHK29163
P1621: Control Module Ignition Off Timer Performance. ... this truck and a pile of loss of communication codes, we have checked wiring and relays, but everthing looks ok ! but before we start changing box's, has anyone seen this problem before. the trouble code tree for p1621 leads...
March 11, 2008