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TCM E39 / P0729 00

Read the instructions below then start the fault diagnostic procedure.

Symptom: Message appears in display.

  P0729 00


Gear 6, Faulty Gear Ratio.

Fault symptom

Message appears in display.

On-board diagnosis

Type of diagnosis:

Continuous

Enable criteria:

Battery voltage must be between 10.2 - 15.5 V.
Selector lever in position D.
6th gear engaged
Accelerator pedal position > 10 %.
Engine speed over 60 rpm.
Oil temperature >20 ° C
TCM not in Limp Home
The following diagnostic trouble codes may not be generated:
P0716
P0717
P0721
P0722

Fault criteria:

Gear ratio measured by the control module varies more than 20 % from the expected value.
The fault criterion must be met for at least 1 second 12 times.

System reaction to a fault:

Limp home

Diagnostic help

Diagnosis regards:

Locating a mechanical fault.