OBD Guide
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U2629

Reductant Control Module Lost Communication With Reductant Tank Temperature Sensor 1

U2629 is an OBD-II diagnostic trouble code meaning: Reductant Control Module Lost Communication With Reductant Tank Temperature Sensor 1. Common causes: open or short circuit in the temperature sensor circuit, adblue tank temperature sensor malfunction. Estimated repair cost: $28–89.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$28–89 (est.)

Symptoms

  • Check Engine light comes on
  • Possible engine power limitation
  • AdBlue system error message on the dashboard
  • Increased NOx emissions
  • Inability to start the engine after a certain mileage (if the system blocks the start)

Causes

  • Open or short circuit in the temperature sensor circuit
  • AdBlue tank temperature sensor malfunction
  • Connector problems or contact corrosion
  • AdBlue control module malfunction
  • Problems with the wiring harness between the sensor and the module

How to Fix

  1. Check the continuity of the temperature sensor circuit
  2. Inspect connectors and contacts for corrosion or damage
  3. Check the resistance of the temperature sensor
  4. Scan the system for additional errors
  5. If necessary, replace the temperature sensor or control module

Related codes

U2628U2630U2619

FAQ

What does the U2629 code mean?

U2629 is an OBD-II diagnostic trouble code that indicates: Reductant Control Module Lost Communication With Reductant Tank Temperature Sensor 1

What causes a U2629 error code?

The most common causes of U2629 include: Open or short circuit in the temperature sensor circuit; AdBlue tank temperature sensor malfunction; Connector problems or contact corrosion; AdBlue control module malfunction.

How do I fix a U2629 diagnostic trouble code?

To fix U2629: Check the continuity of the temperature sensor circuit. Inspect connectors and contacts for corrosion or damage. Check the resistance of the temperature sensor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U2629?

Limited driving only, diagnose soon

How much does it cost to fix U2629?

The estimated repair cost for U2629 is $28–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat