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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 26 (Engine Controls Self-Diagnostics - 5.0L & 5.7L) >> 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 2001 GMC Savana, 2001 Chevrolet RV Cutaway, 2001 Chevrolet Cutaway, and 2001 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.

Powertrain Control Module (PCM) uses 5-volt reference 2 circuit as a sensor feed for Fuel Tank Pressure (FTP) sensor. PCM monitors voltage on 5-volt reference 2 circuit. DTC sets if voltage is out of tolerance.

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