P1860
TCC PWM Solenoid Circuit Electrical
Severity
⚠️ MediumCan you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–56 (est.)
Symptoms
- Check Engine light comes on
- The car goes into emergency transmission mode
- Deterioration in acceleration dynamics
- Increased fuel consumption
- Unstable operation of the torque converter
Causes
- Open or short circuit in TCC solenoid circuit
- Torque converter lock-up solenoid malfunction
- Problems with wiring harness or contacts
- Transmission control module (TCM) malfunction
- Poor connection or corrosion in connectors
How to Fix
- Diagnose the TCC solenoid circuit using a multimeter
- Check the resistance and performance of the solenoid
- Inspect the wiring harness and connectors for damage.
- Replace TCC solenoid if necessary
- Clear contacts and restore connections