3.2.220. SPN 4344, FMI 12, DEF supply module temperature measurement module is not respondingΒΆ

Description

The DEF supply module temperature module is not responding.

Possible causes are:

  • The DEF supply module internal temperature sensor is defective.
  • The DEF supply module wiring is defective.
  • The DEF supply module is defective.

Reaction in EEM

The FC is stored and the warning lamp is activated. The CAN message indicates active fault.

Solution

First save the error log and then erase it. Restart the ECU after erasing the error log. If the fault occurs again during the next driving cycle, check the following paths:

  • Check the DEF supply module wiring, the connectors and the contact surfaces of the connector pins (possible oxidation). (see Supply module)
  • Check the operation with another DEF supply module to see if the supply module is defective.