Diagnostic Aids

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Inspect wiring for poor connections. Check for bent, backed out or damaged terminals, or poor terminal tension. Check for chafed wire or broken wire inside insulation. When diagnosing intermittent condition, wiggle wiring harness while watching scan tool for change in value.

Drive the vehicle if necessary to experience a fault.

This DTC may indicate that solenoid "D" is mechanically defective.

Solenoids are sensitive to battery voltage spikes and poor ground connections. This condition might not be indicated with a scan tool or a DVOM. The ideal way to test for these conditions would be to attach an oscilloscope.

Multiple inactive pressure switch DTCs may be due to a plugged control main filter. Ensure that the initial 5000-mile filter change was performed.