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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 79 (Engine Controls - Self-Diagnostics - 4.0L) >> Diagnostic Tests >> DTC P1639: 5-Volt Reference 2 Circuit >> Description

DTC P1639: 5-Volt Reference 2 Circuit: Description

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

The PCM uses the 5-volt reference 2 circuit as a sensor feed for the following sensors:

The PCM monitors the voltage on the 5-volt reference 2 circuit. If the voltage is outside an acceptable range, the PCM will set DTC P1639.

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