DTC Advanced Diagnostics: P1A48
DTC P1A48 : TCM Internal Malfunction (SBW Different Run)
General Description
The transmission control module (TCM) detects an abnormality by the correlation of the SBW shifter control module and parking actuator valve stroke sensor signals and the shift position command and indication. The SBW control switches the shift position/mode only when there is a signal from the SBW shifter control module. If any of the following conditions occur for a specified duration, the TCM detects a malfunction and stores a DTC.
- The shift position/mode command changed from D or S to R with no signal input from the SBW shifter control module.
- The shift position/mode command changed from R to D or S with no signal input from the SBW shifter control module.
- The shift position/mode command changed from R to D or S while D or S to R is input from the SBW shifter control module.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | - |
| DTC Type | One drive cycle, MIL on, shift position indicator blinks |
Enable Conditions
| Condition | |
|---|---|
| Vehicle | ON mode |
Malfunction Threshold
One of the conditions is occurred for a specified time:
- The shift position/mode command changed from D or S to R with no signal input from the SBW shifter control module.
- The shift position/mode command changed from R to D or S with no signal input from the SBW shifter control module.
- The shift position/mode command changed from R to D or S while D or S to R is input from the SBW shifter control module.
Possible Cause
- TCM internal circuit failure
Confirmation Procedure
Operating Condition
- Start the engine.
- While pressing the brake pedal, wait for several seconds in all positions/modes.
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, the MIL comes on, the shift position indicator blinks, and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the TCM memory.
Conditions for clearing the DTC
The shift position indicator comes off by turning the vehicle to the OFF (LOCK) mode. The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool clear command.