P074A

Diagnostic trouble code (DTC) information

Condition
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:
- Transmission fluid temperature over +20 °C (68 °F).
- Approx. 4% outside of current gear's normal work area.

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
- Auxiliary program Emergency mode 2 in the transmission control module (TCM) has started.

Hint: Emergency mode in the event of a fault Emergency Mode In Case Of Malfunction

Possible source
- Contact resistance or one of the solenoids has stuck in OFF or ON position.
- Mechanical fault in the transmission.

Fault symptom[s]
- Malfunction indicator light (MIL), on
- Abnormal slipping gearshifts
- Automatic transmission/No automatic gearshift
- Text window and warning symbol/Red symbol and text message
- Warning lights and chimes/Malfunction Indicator Light ("Check engine" light) indication/no indication