U1146 - Lost Communication With External Memory

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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U1146 Possible Causes

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

First diagnose U1146 code

    Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded terminals.

Cost of diagnosing the U1146 code

    Labor: 1.0

    The cost of diagnosing the U1146 code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

U1146 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 More Information

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U1146 Information for specific makes

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U1146 Comments

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