P1621 Diagnostic Trouble Code Discussion for November 2015
Control Module Long Term Memory Performance
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| Help Request | Posted | |
| 1997 Chevrolet Express 1500 5.7L Poor Idle Quality, MIL Lamp on VIN: 1GNFG15R8V P1621: Control Module Long Term Memory Performance. I starting to pull my hair out !!! I would like to keep what little hair I have. The van first came in with a hard start. Did a fuel pressure test an it failed. Put a new gm fuel pump an fuel filter in truck. We also said that the fuel pressure regulator was l... |
November 10, 2015 |
