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2002 Chevrolet Trailblazer LS 4.2L codes P1633, B1440
Hi everyone. This TrailBlazer came in with service soon light, 4x4 light, 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...
FIX posted 1/5/2005
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Message Closed w/FIX
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Related Documents & Media | VIN | 1GMDT13S42 |
| Engine | 4.2 L / 6 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | FI |
| Emissions | OBD-II Compliant |
| Symptoms | Codes P1633, B1440 |
| Occurs | Intermittently |
Trouble Codes
| B1440 | Ign 0 voltage loss to BCM |
| P1633 | TCM Internal - Test External Watchdog Performance |
Message Closed w/FIX
Vehicle Data
2002 Chevrolet Trailblazer LS
| VIN | 1GMDT13S42 |
| Engine | 4.2 L / 6 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | FI |
| Emissions | OBD-II Compliant |
| Symptoms | Codes P1633, B1440 |
| Occurs | Intermittently |
Trouble Codes
| B1440 | Ign 0 voltage loss to BCM |
| P1633 | TCM Internal - Test External Watchdog Performance |
Video