VOLVO
TCM-0054 - Lock-up pressure switch. Stuck
System
Transmission Control Module (TCM)
Volvo models this fault code applies to
Applies to the following models:
2 modelsS80 (1999–2006), XC90 (2003–)
Show models by year and engine (2)
What does this fault code mean?
The control module reads the lock-up pressure switch (PS4), which shows where the lock-up valve sits. The fault indicates the lock-up solenoid is jammed closed, based on that signal, so the lock-up function cannot be engaged.
Possible causes
- The lock-up pressure switch is stuck
- Contact resistance in the connections
- Mechanical fault in the transmission control system
- The transmission oil level is too high
What you can do
- 1Read off the fault codes and deal with any other transmission fault codes first
- 2Check the transmission oil level; a level that is too high can cause the fault, so if the level is wrong a workshop should correct it
- 3Use a multimeter to check that the wires to the pressure switch have no open circuit
- 4Have a workshop check the connectors to the control module and the transmission for contact resistance and oxidation, and replace the oil filter if needed
- 5If the fault remains, the control module or the pressure switch module may need replacing; a workshop does this
Symptoms you may notice3
- General orange warning lamp on
- No lock-up function
- Harsh gear shifting
What the fault can affect3
- The Emergency mode II program is activated
- Line pressure is not reduced when gears are engaged or when the gear selector is moved between P-R, N-R and N-D
- The engine control module receives no torque limiting request during gear changes
General guidance for car owners. Diagnosis on the car can point to a different cause.