OBD Guide
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U1044

Engine Communication Circuit

U1044 is an OBD-II diagnostic trouble code meaning: Engine Communication Circuit. Common causes: broken or damaged wires in the communication circuit, poor contact in connectors. Estimated repair cost: $17–111.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–111 (est.)

Symptoms

  • Check Engine Light Is On
  • The engine is unstable
  • Power Loss
  • The car goes into emergency mode
  • Gear shifting problems (for automatic transmissions)

Causes

  • Broken or damaged wires in the communication circuit
  • Poor contact in connectors
  • Engine control module (ECM) malfunction
  • Transmission Module (TCM) Problems
  • Short circuit in communication circuit

How to Fix

  1. Check the integrity of the wires in the communication circuit
  2. Inspect and clean all connectors
  3. Check power supply and grounding of modules
  4. Scan all modules for errors
  5. If necessary, replace the faulty module

Related codes

U1000U1010U1020

FAQ

What does the U1044 code mean?

U1044 is an OBD-II diagnostic trouble code that indicates: Engine Communication Circuit

What causes a U1044 error code?

The most common causes of U1044 include: Broken or damaged wires in the communication circuit; Poor contact in connectors; Engine control module (ECM) malfunction; Transmission Module (TCM) Problems.

How do I fix a U1044 diagnostic trouble code?

To fix U1044: Check the integrity of the wires in the communication circuit. Inspect and clean all connectors. Check power supply and grounding of modules. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1044?

Limited driving only, diagnose soon

How much does it cost to fix U1044?

The estimated repair cost for U1044 is $17–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat