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.

This DTC indicates the offgoing clutch having a hydraulic feed blocked by the solenoid "D" is applied or disengaged too slowly. This could indicate a leak or obstruction in a specific clutch apply circuit. Check scan tool failure record data for previous or current range information when the DTC was set to determine the specific shift when the DTC was set. Refer to appropriate solenoid and clutch chart to determine which clutch circuit is suspect. See CLUTCH & SOLENOID APPLICATIONS under TROUBLE SHOOTING.

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. As an alternate way to check for an intermittent battery or ground connection, a jumper harness could be fabricated and used as a bypass for the OEM harness. The Breakout Box (J-39700) with the Adapter Box and Harness (J-43799) can be used to supply voltage directly to the TCM C1 connector. If this corrects the solenoid code problem, repair wiring harness.