OBD Guide
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U11C2

Lost Tranmission Message

U11C2 is an OBD-II diagnostic trouble code meaning: Lost Tranmission Message. Common causes: broken or damaged wires in the communication circuit, corroded transmission module connectors. Estimated repair cost: $56–278.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–278 (est.)

Symptoms

  • Check Engine light comes on
  • The car goes into emergency mode
  • Gear shifting problems
  • Reduced engine power
  • Unstable operation at idle

Causes

  • Broken or damaged wires in the communication circuit
  • Corroded transmission module connectors
  • Transmission control module malfunction
  • Transmission module power supply problems
  • Software failure in the transmission module

How to Fix

  1. Check the integrity of the wiring harness to the transmission module
  2. Inspect and clean transmission module connectors
  3. Check power and ground of transmission module
  4. Scan the transmission module for errors
  5. If necessary, replace the transmission control module

Related codes

U0100U0101U0121

FAQ

What does the U11C2 code mean?

U11C2 is an OBD-II diagnostic trouble code that indicates: Lost Tranmission Message

What causes a U11C2 error code?

The most common causes of U11C2 include: Broken or damaged wires in the communication circuit; Corroded transmission module connectors; Transmission control module malfunction; Transmission module power supply problems.

How do I fix a U11C2 diagnostic trouble code?

To fix U11C2: Check the integrity of the wiring harness to the transmission module. Inspect and clean transmission module connectors. Check power and ground of transmission module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U11C2?

Do not drive — repair immediately

How much does it cost to fix U11C2?

The estimated repair cost for U11C2 is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat