U12A3
Lost Communication With Particulate Matter Sensor
U12A3 is an OBD-II diagnostic trouble code meaning: Lost Communication With Particulate Matter Sensor. Common causes: broken or damaged wiring to the sensor, malfunction of the particle sensor itself. Estimated repair cost: $50–133.
Symptoms
- Check Engine Light Is On
- Possible reduction in engine power
- The diesel particulate filter regeneration system may not work
- The need for manual filter regeneration
- Possible problems when passing technical inspection
Causes
- Broken or damaged wiring to the sensor
- Malfunction of the particle sensor itself
- Problems with connection connectors
- Engine ECU malfunction
- Short circuit in the sensor circuit
How to Fix
- Check the integrity of the wiring harness to the sensor
- Inspect the sensor connectors for corrosion or damage.
- Check the power and ground of the sensor circuit
- Test the sensor using diagnostic equipment
- If necessary, replace the sensor or wiring
Related codes
FAQ
What does the U12A3 code mean?
U12A3 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Particulate Matter Sensor
What causes a U12A3 error code?
The most common causes of U12A3 include: Broken or damaged wiring to the sensor; Malfunction of the particle sensor itself; Problems with connection connectors; Engine ECU malfunction.
How do I fix a U12A3 diagnostic trouble code?
To fix U12A3: Check the integrity of the wiring harness to the sensor. Inspect the sensor connectors for corrosion or damage.. Check the power and ground of the sensor circuit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U12A3?
Limited driving only, diagnose soon
How much does it cost to fix U12A3?
The estimated repair cost for U12A3 is $50–133. Actual cost depends on your vehicle, location, and labor rates.
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