P1860 BUICK, CADILLAC, CHEVROLET, GMC, OLDSMOBILE, PONTIAC, SATURN: TCC PWM SOLENOID CIRCUIT ELECTRICAL
POST UPDATED IN June, 2023
P1860 BUICK, CADILLAC, CHEVROLET, GMC, OLDSMOBILE, PONTIAC, SATURN: TCC PWM SOLENOID CIRCUIT ELECTRICAL
The Torque Converter Clutch Pulse Width Modulation Solenoid (TCC PWM) controls the fluid passing over the converter clutch valve, which regulates the application and release of the TCC.
The PWM TCC is attached to the control valve body, which is located inside the transmission. The PCM (Powertrain Control Module) provides a ground signal on circuit 418 to the solenoid. Current is sent through the solenoid coil, taking into account the duty cycle, which translates into the percentage on/off time. This solenoid provides smooth clutch engagement by operating for a percentage of the duty cycle.
If the PCM notices a continuous open, short to ground, or power on the TCC PWM Solenoid TCC circuit, the P1860 OBD2 fault code will be set.
Reasons to set the P1860 OBDII DTC P1860:
Steps to solve the P1860 OBD2 diagnostic code: