AutoCodes - OBDII Code List - U0101 SCION

U0101 SCION - Lost Communication With Transmission Control Module

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3    What is this?
Comments  |  Add Comment

U0101 SCION Possible Causes

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

How do I fix code U0101 SCION

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 connector's pins.

Cost of diagnosing the U0101 SCION code

Labor: 1.0

The cost of diagnosing the U0101 SCION 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.

Possible Symptoms

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

U0101 Scion Description

The Transmission Control Module (TCM) and Engine Control Module (ECM) perform 2-way communications with each other via the Controller Area Network (CAN). The TCM sends signals to the ECM concerning required engine rpm, required engine torques, warning indicators in the combination meter, DTCs and other data. The ECM sends signals to the TCM concerning engine rpm, opening angles of the throttle valve, temperature of intake air, temperature of engine coolant, engine torques and other data. If the TCM cannot communicate with the ECM, the TCM will conclude that there is a malfunction in the CAN system, illuminate the MIL and set a DTC.
OBDII Code U0101 Scion - Lost Communication With Transmission Control Module  -

U0101 SCION More Information

Need more information on how to fix the U0101 SCION code?
Get Access to Factory Service Manuals

Need more help?

Get the U0101 Scion code diagnosed by a professional: Find a repair shop in your area


Help us improve Leave a comment below or tell us if the information above help you fix the code. What are the symptoms on your vehicle for the U0101 Scion code? Have you replaced any parts?
Any information is appreciated. Thanks
Top ⇧