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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 112 (Engine Controls Self-Diagnostics) >> Diagnostic Tests >> DTC P1639: 5-VOLT REFERENCEWide Open Throttle (WOT)CIRCUIT >> Conditions For Running DTC

Conditions For Running DTC

WARNING: This page is about a different car, the 2002 Pontiac Montana, 2002 Oldsmobile Silhouette, and 2002 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.

The engine must be running.

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