P1621 Diagnostic Trouble Code Discussion for March 2008
Control Module Long Term Memory Performance
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| 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 |
