Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information

Condition




The transmission control module (TCM) receive signals on the input and output speed from the two gearbox speed sensors. There is a predetermined ratio for each gear and using the signals, the control module can calculate the gearbox gear ratio. If the transmission control module (TCM) registers that the gear ratio deviates more than 10%, the diagnostic trouble code (DTC) TCM-P073100, TCM-P073200, TCM-P073300, TCM-P073400, TCM-P073500 or TCM-P072900 is generated depending on the cause of the fault.
The diagnostic trouble: (DTC) can be diagnosed at transmission fluid temperatures above +20 °C and for:
- TCM-P073100 Gear 1 and engine speed above 250 but below 1350 rpm and accelerator pedal position greater than 10% and gear ratio = 2.301 +/- 20%
- TCM-P073200 Gear 2 and engine speed above 500 rpm plus accelerator pedal position greater than 10% and gear ratio =2.301 +/- 20%.
- TCM-P073300 Gear 3 and engine speed above 500 rpm plus accelerator pedal position greater than 10% and gear ratio =2.301 +/- 20%.
- TCM-P073400 Gear 4 and engine speed above 500 rpm plus accelerator pedal position greater than 10% and gear ratio =2.301 +/- 20%.
- TCM-P073500 Gear 5 and engine speed above 500 rpm plus accelerator pedal position greater than 10% and gear ratio =2.301 +/- 20%.
- TCM-P072900 Gear 6 and engine speed above or equal to 250 rpm plus engine torque greater than or equal to 80Nm and no acceleration.

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

Hint: Emergency mode in case of malfunction Emergency Mode in Case of Malfunction

Possible source
- Contact resistance or one of solenoid's regulating incorrectly. See table below:





- Mechanical fault in gearbox. Gearbox components worn and causing slip or system pressure too low.

Fault symptom[s]
- Malfunction indicator lamp (MIL) lit.
- General warning lamp lit
- Abnormally slipping gears.
- Harsh gear changing
- No gear changing.