Diagnostic trouble code (DTC) information

Condition 

Fig 1: Identifying Line Pressure Solenoid, SLS

Courtesy of VOLVO CARS OF NORTH AMERICA.

Line pressure solenoid SLS regulates the line pressure in the transmission. The solenoid is controlled by a power stage in the transmission control module (TCM) output. The transmission control module (TCM) uses the power stage to control the current to the solenoid. A low amperage results in a high line pressure. A high amperage (approximately 1 A) gives a low line pressure. The amperage is primarily affected by the throttle position. Diagnostic trouble code (DTC) TCM-0112 is stored if the control module (TCM) registers a short-circuit to battery voltage in the circuit for solenoid SLS. This results in too high an amperage in the circuit. Solenoid SLS cannot then control the line pressure.

Substitute Value 

• Transmission control module (TCM) "Limp Home" program has been initiated.

Possible Source 

• Short-circuit to supply voltage in the control signal wiring or signal wiring.
• Short-circuit between the control signal cable and the signal cable.
• Defective solenoid.

Fault symptom[s] 

• The automatic transmission warning lamp is lit.
• No shifting.
• No lock-up function.

HINT: No shifting because the control module prevents activation of the solenoids.