U1146 - Lost Communication With External Memory

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

  • Faulty Transmission Control Module (TCM)
  • Transmission Control Module (TCM) harness is open or shorted
  • Transmission Control Module (TCM) circuit poor electrical connection
  • Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • U1146 Description

    The first time the vehicle is started, the Transmission Control Module (TCM) receives hydraulic calibration data from an external EEPROM (located in the transmission) and stores this information in the EEPROM of the TCM. If the TCM can not read the external EEPROM in the transmission this DTC will set. It takes two consecutive failures to turn on the MIL.
    OBDII Code U1146 - Lost Communication With External Memory - AutoCodes.com

    U1146 Information for specific makes

  • U1146 CHRYSLER Lost Communication With External Memory
  • U1146 DODGE Lost Communication With External Memory
  • U1146 JEEP Lost Communication With External Memory
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    Related Information

    U1146 Comments

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