P1755 TOYOTA: TORQUE CONVERTER CLUTCH SOLENOID CIRCUIT MALFUNCTION
POST UPDATED IN January, 2023
P1755 Code failures by brands
Description of DTC code P1755
The PCM (Powertrain Control Module) checks that the different systems of the car are working properly, thus ensuring optimum vehicle performance. For the transmission control system, the TCC (Torque Converter Clutch) is monitored to prevent the transmission from locking up.
When the TCC solenoid is activated, hydraulic pressure is sent to the converter, thus preventing the transmission from locking up. By the time the solenoid is deactivated, the pressure delivery is interrupted and the transmission locks up. The torque converter clutch solenoid is monitored by the PCM, which diagnoses the torque converter clutch solenoid to verify that it is functioning properly. If the PCM detects that the circuit controlling the TCC solenoid is malfunctioning, the P1755 OBDII fault code will be set.
Symptoms of fault code P1755
- Check Engine light is on.
- Unable to shift gears.
Causes of OBD2 P1755
The reasons for setting the P1755 OBD2 diagnostic code are:
- The transmission may not have a sufficient amount of fluid.
- The transmission fluid may have been contaminated.
- The TCC solenoid wiring or connectors may be faulty.
- The Torque Converter Clutch solenoid may have been damaged.
Possible solutions of the DTC code P1755
To troubleshoot the DTC P1755 OBDII code you must do the following:
- Consult the Technical Service Bulletins.
- Check that the transmission has the necessary amount of fluid. If the fluid level meets the requirements, check for contamination. Correct it as necessary.
- Check wiring and connections related to the Torque Converter Clutch solenoid for deficiencies caused by corrosion or burns. If damaged, repair or replace as necessary.
- Using the appropriate tools, check if the TCC solenoid resistance matches the resistance specified by the manufacturer. If a different value is found, replace the solenoid.
