Diagnostic Trouble Code (DTC) Information

DTC information
981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428 998 8686 Replaced by 9511532 998 8686 Replaced By 9511532
Condition





The vehicle speed signal (VSS) comes from a sensor on the transmission. The transmission control module (TCM) uses the signal to select the correct gear. The transmission control module (TCM) also uses the transmission speed sensor signal to determine vehicle speed. Diagnostic trouble code (DTC) AT-232 is posted if the transmission control module (TCM) registers that there is no vehicle speed signal (VSS) signal.

Substitute value
The transmission control module (TCM) "Emergency mode II" program is initiated.

Possible source
- Open-circuit in the signal cable (+) or signal cable (-).
- Signal cable (+) or signal cable (-) short-circuited to ground, supply voltage or each other.
- Defective vehicle speed sensor (VSS)
- Contact resistance in terminals

Fault symptom[s]
- The combined instrument panel warning lamp flashes.
- No lock-up function.
- No adaption of the gear slippage times at high altitude (High Altitude Compensation)
- No reduction of system pressure when shifting, making shifting harsher.
- No reduction of system pressure when moving the gear selector between positions P-R, N-R and N-D which causes harsh gear meshing.
- No torque limiting request to engine control module (ECM) when shifting

Note! The Motronic 4.4 engine control module (ECM) posts a diagnostic trouble code (DTC) when the transmission sends a malfunction indicator lamp (MIL) request. Erase this diagnostic trouble code (DTC) in the Motronic engine control module (ECM) when the transmission fault has been repaired.