OBD Guide
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U2106

Lost Communications With Transmission Control Module

U2106 is an OBD-II diagnostic trouble code meaning: Lost Communications With Transmission Control Module. Common causes: open or short circuit in tcm power circuit, damage to the wiring harness to the tcm. Estimated repair cost: $167–556.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$167–556 (est.)

Symptoms

  • Emergency operation of the gearbox
  • Inability to change gears
  • The Check Engine light comes on
  • Loss of engine power
  • Jerking when shifting gears

Causes

  • Open or short circuit in TCM power circuit
  • Damage to the wiring harness to the TCM
  • Transmission control module malfunction
  • CAN bus problems
  • Oxidation of TCM connector contacts

How to Fix

  1. Check TCM power circuit fuses
  2. Inspect the wiring harness for damage
  3. Check the integrity and cleanliness of the TCM connector contacts
  4. Diagnose the TCM module with a scanner
  5. If necessary, replace the transmission control module

Related codes

U0100U0101U2100

FAQ

What does the U2106 code mean?

U2106 is an OBD-II diagnostic trouble code that indicates: Lost Communications With Transmission Control Module

What causes a U2106 error code?

The most common causes of U2106 include: Open or short circuit in TCM power circuit; Damage to the wiring harness to the TCM; Transmission control module malfunction; CAN bus problems.

How do I fix a U2106 diagnostic trouble code?

To fix U2106: Check TCM power circuit fuses. Inspect the wiring harness for damage. Check the integrity and cleanliness of the TCM connector contacts. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U2106?

Limited driving only, diagnose soon

How much does it cost to fix U2106?

The estimated repair cost for U2106 is $167–556. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat