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Home >> Pontiac >> 2001 >> Aztek Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P1639: 5-Volt Reference "B" Circuit ("U" Series) >> Code Enable Criteria

Code Enable Criteria

DTC will run when engine is running and DTC will set when PCM detects a voltage out of tolerance condition on the 5-volt reference "B" circuit for more than 10 seconds.

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