The torque converter lockup clutch is operated by hydraulic pressure, and the torque control solenoid / torque converter clutch solenoid / TCC solenoid is responsible for controlling that pressure. If the TCM detects a problem with said solenoid, a P1813 DTC will be stored.
How Serious is the Code?
A P1813 diagnostic trouble code is fairly serious, because the torque control solenoid is essential to the operation of your transmission. If it’s not functioning properly, the transmission can refuse to shift and the engine can even stall.
Symptoms of a P1813 include:
- Increased fuel consumption
- Transmission overheats
- Engine stalling
- Failed torque control solenoid
- Damage to the torque control solenoid harness
- Torque converter clutch issues
How to Diagnose the Code?
The first thing that should be done is to check the torque control solenoid / TCC solenoid wiring harness for evidence of shorts and other damage. If no issues are found, then the TCC solenoid will need to be tested. If there are no torque converter clutch solenoid problems, then the torque converter clutch assembly may be to blame.
What Repairs Will Fix P1813?
Replace the torque control solenoid
Repair the torque control solenoid wiring
Repair or replace the torque converter clutch assembly
P0741 – Torque Converter Clutch Circuit Performance or Stuck Off
P0742 – Torque Converter Clutch Circuit Stock On
P0743 – Torque Converter Clutch Circuit Electrical
P0744 – Torque Converter Clutch Circuit Intermittent
P1813 – Torque Control Solenoid Malfunction