P1633 Diagnostic Trouble Code Discussion for December 2004
TCM Internal - Test External Watchdog Performance
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| 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 |
