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P1633 Diagnostic Trouble Code Discussion for December 2004

TCM Internal - Test External Watchdog Performance


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Trouble Ticket Help Requests for DTC P1633
Help Request Posted
2002 Chevrolet Trailblazer LS 4.2L codes P1633, B1440 VIN: 1GMDT13S42
P1633: Ignition Supplement Power (0) Switch Circuit Malfunction. ... and ABS light on. The VCM, ATC, BCM, and IPC all had a pile of 'loss of voltage' and communication codes. We replaced the ignition switch which fixed most of it. Were now left with P1633 and B1440. They both concern Ign ...
December 30, 2004
2002 Chevrolet Trailblazer LS 4.2L codes P1633, B1440 VIN: 1GMDT13S42
P1633: Ignition Supplement Power (0) Switch Circuit Malfunction. ... and ABS light on. The VCM, ATC, BCM, and IPC all had a pile of 'loss of voltage' and communication codes. We replaced the ignition switch which fixed most of it. Were now left with P1633 and B1440. They both concern Ign ...
December 30, 2004