P1860 P1860 OBD Code Definition: P1860 TCC PWM Solenoid Circuit Electrical P1860 OBD Code Description: OBD Code P1860 TCC PWM Solenoid Circuit Electrical OBD Code P1860 TCC PWM Solenoid Circuit Failure OBD Code P1860 TCC PWM solenoid circuit electrical / transmission transfer case contact plate D Short circuit to battery OBD Code P1860 Kick Down Switch Error Message from Engine Contr.