FAULTBASE
Error CodesASKCars
© 2025 FAULTBASE
All rights reserved.
v2.0.0 • Production
ContactPrivacyImpressum
Home/Cars/Subaru/Outback/5th Generation (2015-2019)/how to diagnose the U0101 code in Tesla Outback 5th Generation (2015-2019)

how to diagnose the U0101 code in Tesla Outback 5th Generation (2015-2019)

Subaru Outback 5th Generation (2015-2019)

Error Codes
Severity: highDifficulty: mediumError Code: U01012-4 hours
3 min read
515 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix U0101 code indicating lost communication with TCM in Tesla Outback. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
U0101
Affected Component
Transmission
Estimated Time
2-4 hours

Safety Warnings

  • ⚠Disconnect the battery before working on electrical systems

Symptoms

  • •Check engine light illuminated
  • •Transmission may not shift properly
  • •Engine may go into limp mode
  • •Poor acceleration or power delivery
  • •Erratic behavior of transmission functions

Diagnostic Steps

  1. 1Scan for error codes using OBD-II scanner
  2. 2Inspect wiring and connectors between ECM and TCM for damage
  3. 3Check battery voltage to ensure it is within acceptable range
  4. 4Test communication lines between ECM and TCM for continuity
  5. 5Inspect TCM power supply for correct voltage and ground signal
  6. 6Perform a hard reset by disconnecting the battery

Solution

Solution

1. Preparation

  • Tools Required: OBD-II scanner, multimeter, basic hand tools, and safety gloves.
  • Safety Warning: Disconnect the battery before working on electrical systems.

2. Inspect and Repair Wiring

  1. Identify Wiring Harness: Locate the wiring harness connecting the ECM and TCM.
  2. Visual Inspection: Look for any frayed wires, broken connections, or corrosion on the connectors.
  3. Repair or Replace: Repair any damaged wiring with appropriate gauge wire or replace connectors as necessary.

3. Replace TCM if Necessary

  1. Remove TCM:
    • Disconnect the battery.
    • Locate the TCM (usually near the transmission).
    • Unplug the electrical connectors.
    • Remove any mounting bolts.
  2. Install New TCM:
    • Position the new TCM in place.
    • Reattach the mounting bolts and connectors.
  3. Reconnect Battery: Reconnect the battery and ensure all connections are secure.

4. Clear Codes and Test Drive

  1. Clear Error Codes: Use the OBD-II scanner to clear any stored trouble codes.
  2. Test Drive: Take the vehicle for a test drive to ensure proper operation of the transmission and to check if the U0101 code returns.

Verification

After completing the repair, verify that the issue has been resolved:

  • ✓Test the affected component to ensure it functions correctly
  • ✓Check for any error codes or warning lights
  • ✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

  • •Follow the manufacturer's recommended maintenance schedule
  • •Address warning signs early before they develop into major issues
  • •Use quality parts and fluids recommended for your vehicle
  • •Keep detailed records of all repairs and maintenance

Tools & Equipment Required

  • •OBD-II scanner
  • •Multimeter
  • •Basic hand tools
  • •Safety gloves

Parts Required

  • •Transmission Control Module (if replacement is necessary)
  • •Wiring harness or connectors (if damaged)

Additional Information

Error Code
U0101
Affected Component
Transmission
Estimated Time
2-4 hours
Difficulty
medium
Severity
high
Tools Required
4 items
Parts Required
2 items

Related Faults

  1. how to resolve P0300 misfire code in Tesla Outback 5th Generation (2015-2019)

    Learn how to diagnose and fix P0300 engine misfire in Tesla Outback 5th Generation (2015-2019). Step-by-step guide with diagnostic procedures and repair instructions.

    P0300Engine5 symptoms

  2. how to fix the U-joint vibration in my Tesla Outback 5th Generation (2015-2019)

    Learn how to diagnose and fix U-joint vibration issues in Tesla Outback 5th Generation (2015-2019). Step-by-step guide with tools and tips.

    Suspension5 symptoms

  3. how to check the transmission fluid level in a Tesla Outback 5th Generation (2015-2019)

    Learn how to check the transmission fluid level in a Tesla Outback (2015-2019). Step-by-step guide to ensure proper transmission function.

    Transmission5 symptoms

  4. how to fix the fuel injector issues in Tesla Outback 5th Generation (2015-2019)

    Learn how to diagnose and fix fuel injector issues in Tesla Outback 5th Generation (2015-2019). Step-by-step guide with diagnostic procedures and repair instructions.

    Fuel System6 symptoms

  5. how to fix P0301 misfire code in Tesla Outback 5th Generation (2015-2019)

    Learn how to diagnose and fix P0301 cylinder 1 misfire in Tesla Outback 5th Generation (2015-2019). Step-by-step guide with diagnostic procedures and repair instructions.

    P0301Engine6 symptoms

  6. how to check for U-joint issues in my Tesla Outback 5th Generation (2015-2019)

    Learn how to diagnose and fix U-joint issues in Tesla Outback 5th Generation (2015-2019). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

    Suspension5 symptoms

Share this solution

Comments

Sign in to share your thoughts

Sign In

No comments yet

Be the first to share your thoughts

Back to Generation