P1621 Diagnostic Trouble Code Discussion for September 2012
Control Module Long Term Memory Performance
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| Help Request | Posted | |
| 2003 Chevrolet Silverado 2500 HD 6.6L Surge, Misfire VIN: 1GCHK23183 P1621: Control Module Ignition Off Timer Performance. Customer stated at times the vehicle will begin to run rough even misfire according to the customer, he informed me that the vehicle has a bully dog "triple dog" so i ask him to return it factory settings, he did so and i cleared the codes and ask him ... |
September 14, 2012 |
