Transmission Fluid, Replacing: Conditions

The oil should be replaced only in the two following instances: 

Where diagnostic trouble codes (DTCs) TCM 0042 and TCM 0046 are stored, in which case the diagnostic function activates the warning lamp in the following circumstances.

The transmission control module (TCM) receives data about the operating temperature of the transmission fluid while the car is being driven. TCM 0042 is stored after an accumulated amount of time.

Diagnostic trouble code (DTC) TCM 0046 is stored if the transmission fluid temperature exceeds 150° C for more than two minutes.

In cars used in continuous taxi service or used for towing a trailer or caravan for most of its mileage, the oil must be replaced at a service interval of 75, 000 km ± 5000 km. This is to conform to the regular service program.