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Chevrolet
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2002
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Blazer 4D Utility, 4WD, Part Time
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Repair and Diagnosis
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Body & Frame
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Door Locks
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Theft Deterrent System
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Diagnostic Information & Procedures
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DTC P1631: PCM Did Not Receive A Valid Password
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Conditions For Running DTC
Conditions For Running DTC
DTC P1626 is not active.
The powertrain control module (PCM) is not in password learn mode.
The VTD Passlock system is enabled.
The fuel enable decision point has been reached, or the engine is cranking.