Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information TCM-P074B68

Condition

Note! This diagnostic trouble code (DTC) status is an event controlled diagnostic trouble code (DTC). An event controlled diagnostic trouble code (DTC) does not mean that there is a fault in the control module when it is active, but is designed as information.

The transmission control module (TCM) receives a signal about input and output speed from the transmission's two speed sensors. There is a determined ratio for each gear and the signals help calculate the transmission control module (TCM) gear ratio.
The diagnostic trouble code (DTC) is stored if the control module detects that:
- Gear ratio for the gear selected by the control module is close to (4%) another gear's ratio.
The control module's test for the diagnostic trouble code (DTC) starts in the event of:
- Driving with gear 3.

Note! The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.





Substitute value
- Adaptation function is blocked.
- Neutral control function is blocked.
- Shifts to safe gear.

Possible source
- Circuit for the solenoid: SLC2, SLB1
- Damaged/worn clutch.
- Poor oil quality.
- Mechanical fault in the transmission.

Fault symptom[s]
- Automatic transmission/Shifts rough or jerky/Unsure when/at all times
- Automatic transmission/No automatic gearshift