Diagnostic trouble code (DTC) information

Condition 

Fig 1: Identifying Transmission Control Module (TCM)

Courtesy of VOLVO CARS OF NORTH AMERICA.

The transmission control module (TCM) has three different internal memories, one for the software application (FLASH), one for permanent storage of information (EEPROM) and one for current information (RAM). When turning off the ignition, certain information will be saved from the RAM memory to the EEPROM and then deleted from RAM.

The diagnostic trouble code can be diagnosed when the ignition is on.

Substitute Value 

• Auxiliary program Emergency mode 1  in the transmission control module (TCM) has started.

  HINT:  Emergency mode in case of malfunction 

Possible Source 

• Internal fault in transmission control module (TCM).

Fault symptom[s] 

• No gear changing.
• Harsh gear changing