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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 233 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P1639: 5-Volt Reference "B" Circuit >> Conditions For Running DTC

Conditions For Running DTC

WARNING: This page is about a different car, the 2003 Pontiac Montana, 2003 Oldsmobile Silhouette, and 2003 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.

Engine must be running.

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