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P0603 Diagnostic Trouble Code Discussion for November 2007

Control Module Long Term Memory Reset

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Trouble Ticket Help Requests for DTC P0603
Help Request Posted
1999 Cadillac DeVille 4.6L No Start, MIL Lamp on, VIN: 1G6KD54Y1X
P0603: PCM KAM error/reset. Vehicle won't start unless headlight switch is on. No dash activity unless headlight switch is on. Alarm sounds when anything is done... open door, turn ign, start eng. Trans is not shifting, 2nd gear only (no 12v). All fuses are good and have 12v. Relays chec...
November 12, 2007