OBD Guide
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U1879

Drive Motor Control Module 2 Lost Communication With Engine Control Module

U1879 is an OBD-II diagnostic trouble code meaning: Drive Motor Control Module 2 Lost Communication With Engine Control Module. Common causes: broken or damaged can bus wires, poor contact in 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
  • Reduced engine power
  • Problems starting the engine
  • Incorrect operation of the hybrid system (if applicable)

Causes

  • Broken or damaged CAN bus wires
  • Poor contact in module connectors
  • Engine control module 2 malfunction
  • Problems with module power supply
  • Software errors in the ECU

How to Fix

  1. Check the integrity of the CAN bus and connections
  2. Inspect connectors for corrosion or damage
  3. Check power supply to engine control module 2
  4. Read error codes from other modules
  5. Update ECU software (if available)

Related codes

U0100U0101U0121

FAQ

What does the U1879 code mean?

U1879 is an OBD-II diagnostic trouble code that indicates: Drive Motor Control Module 2 Lost Communication With Engine Control Module

What causes a U1879 error code?

The most common causes of U1879 include: Broken or damaged CAN bus wires; Poor contact in module connectors; Engine control module 2 malfunction; Problems with module power supply.

How do I fix a U1879 diagnostic trouble code?

To fix U1879: Check the integrity of the CAN bus and connections. Inspect connectors for corrosion or damage. Check power supply to engine control module 2. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1879?

Do not drive — repair immediately

How much does it cost to fix U1879?

The estimated repair cost for U1879 is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat