P1864 GMC - Torque Converter Clutch Enable Solenoid Electrical Fault Conditions
- Faulty Torque Converter Clutch (TCC)
- Torque Converter Clutch (TCC) harness is open or shorted
- Torque Converter Clutch (TCC) circuit poor electrical connection
- Engine Light ON (or Service Engine Soon Warning Light)
P1864 Gmc DescriptionThe Torque Converter Clutch (TCC) Solenoid Valve is an electrical device used with the TCC PWM Solenoid Valve in order to control the fluid acting on the TCC valve. The TCC valve controls TCC application and release. The solenoid is a normally-open, ON/OFF device. The TCC Sol. Valve attaches to the transmission case assembly extending into the pump cover. The Vehicle Control Module (VCM) monitors the Throttle Position (TP) voltage, the vehicle speed, and other inputs in order to determine when to energize the TCC Sol. Valve.
With the engine speed over 500 rpm for 5 seconds, not in Fuel Shut-off mode, the Powertrain Control Module (PCM) detects the Torque Converter Clutch (TCC) Solenoid Control voltage did not meet calibration (too high or too low). - Refer to the correct code repair chart in other manuals or media.
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