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Diagnostic Aids

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.

If any sensor using a 5-volt bias voltage, such as the IAT sensor or fuel level sensor, is shorted to voltage, DTC P1635 may set in addition to DTC P1639. For an intermittent condition, refer to INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 3.4L MONTANA, SILHOUETTE & VENTURE article.

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