OBD Guide
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U1121

Lost Communication With Electric Stability Program Module

U1121 is an OBD-II diagnostic trouble code meaning: Lost Communication With Electric Stability Program Module. Common causes: broken or damaged wires in the communication circuit, esp module malfunction. Estimated repair cost: $56–278.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–278 (est.)

Symptoms

  • The ESP indicator on the dashboard is on
  • Stabilization system does not work
  • Loss of communication with other modules
  • The car may behave unstably on the road

Causes

  • Broken or damaged wires in the communication circuit
  • ESP module malfunction
  • ESP module power supply problems
  • Corrosion of connectors
  • Problems with the CAN bus

How to Fix

  1. Check the integrity of wires and connectors
  2. Check the power and ground of the ESP module
  3. Scan other modules for communication errors
  4. Check the status of the CAN bus
  5. If necessary, replace the ESP module

Related codes

U0121U0122U0123

FAQ

What does the U1121 code mean?

U1121 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Electric Stability Program Module

What causes a U1121 error code?

The most common causes of U1121 include: Broken or damaged wires in the communication circuit; ESP module malfunction; ESP module power supply problems; Corrosion of connectors.

How do I fix a U1121 diagnostic trouble code?

To fix U1121: Check the integrity of wires and connectors. Check the power and ground of the ESP module. Scan other modules for communication errors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1121?

Limited driving only, diagnose soon

How much does it cost to fix U1121?

The estimated repair cost for U1121 is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat