OBD Guide
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U2626

Reductant Control Module Lost Communication With Engine Control Module On Powertrain Sensor CAN Bus

U2626 is an OBD-II diagnostic trouble code meaning: Reductant Control Module Lost Communication With Engine Control Module On Powertrain Sensor CAN Bus. Common causes: open or short circuit in the can bus, poor contact in the control module or ecu connectors. Estimated repair cost: $56–278.

Severity
🔴 High
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–278 (est.)

Symptoms

  • Check Engine light comes on
  • Possible reduction in engine power
  • Increased fuel consumption
  • Incorrect operation of the exhaust gas purification system
  • AdBlue system error message on the dashboard

Causes

  • Open or short circuit in the CAN bus
  • Poor contact in the control module or ECU connectors
  • Reagent control module malfunction
  • Problems with the engine control unit
  • Corrosion of electrical connections

How to Fix

  1. Check the integrity of the CAN bus and connections
  2. Inspect the control module and ECU connectors for damage
  3. Check power and grounding of the reagent control module
  4. Scan for additional trouble codes
  5. If necessary, replace the reagent control module

Related codes

U2600U2625U2627

FAQ

What does the U2626 code mean?

U2626 is an OBD-II diagnostic trouble code that indicates: Reductant Control Module Lost Communication With Engine Control Module On Powertrain Sensor CAN Bus

What causes a U2626 error code?

The most common causes of U2626 include: Open or short circuit in the CAN bus; Poor contact in the control module or ECU connectors; Reagent control module malfunction; Problems with the engine control unit.

How do I fix a U2626 diagnostic trouble code?

To fix U2626: Check the integrity of the CAN bus and connections. Inspect the control module and ECU connectors for damage. Check power and grounding of the reagent control module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U2626?

Yes, but get it checked soon

How much does it cost to fix U2626?

The estimated repair cost for U2626 is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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