Diagnostic trouble code (DTC) information

Condition 

Fig 1: Identifying Line Pressure Solenoid, SLT

Courtesy of VOLVO CARS OF NORTH AMERICA.

Throttle solenoid SLT controls 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-0116 is stored if the transmission control module (TCM) registers a short-circuit to battery voltage in the solenoid SLT circuit. This results in too high an amperage. Solenoid SLT cannot then control the line pressure.

Substitute Value 

• The transmission control module (TCM) "Emergency mode I" 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] 

• General orange warning lamp lit.
• No shifting.
• Malfunction indicator lamp (MIL) lit.
• No lock-up function.

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