Conditions for Setting the DTC

WARNING: This page is about a different car, the 2003 GMC Yukon XL, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

All conditions for running the DTC are met, and either of the following conditions occur for 4.3 out of 5 seconds.

The PCM commands the TCC PWM solenoid valve to OFF, 0 percent, and the voltage input remains low, zero volts.
The PCM commands the TCC PWM solenoid valve to ON, 100 percent, and the voltage input remains high, B+.