Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information
981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428 998 8686 Replaced by 9511532 998 8686 Replaced By 9511532
Condition





Line pressure solenoid STH regulates the line pressure in the transmission. The solenoid is controlled by a power stage in the control module 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) AT-131 is stored if the transmission control module (TCM) registers an open-circuit, or short-circuit to ground causing too low an amperage, in the solenoid STH circuit. Solenoid STH cannot then control the line pressure.

Substitute value
The transmission control module (TCM) "Emergency mode III"program has been initiated.

Possible source
- Open-circuit in the control signal cable or the signal cable.
- Short-circuit to ground or voltage in control signal cable or signal cable.
- Short-circuit between control signal cable and signal cable.
- Short-circuit to battery voltage in control signal cable.
- Defective solenoid STH.
- Open-circuit in power ground.
- Contact resistance in the terminals.
- Defective control module.

Fault symptom[s]
- The warning lamp in the combined instrument panel flashes.
- No lock-up function.
- No adaptation of the gear slippage times at high altitude (High Altitude Compensation).
- No torque limiting request to engine control module (ECM) when shifting.
- No line pressure solenoid STH control, this results in constant maximum line pressure and leads to harsher shifting and gear engagement.