U029D
Lost Communication With NOx Sensor A
U029D is an OBD-II diagnostic trouble code meaning: Lost Communication With NOx Sensor A. Common causes: nox sensor a fault, open or short circuit in the sensor circuit. Estimated repair cost: $167–444.
Symptoms
- Check Engine light comes on
- Reduced engine power
- Increased fuel consumption
- Problems with passing environmental tests
- Possible SCR system error messages
Causes
- NOx sensor A fault
- Open or short circuit in the sensor circuit
- Damaged or oxidized connectors
- Sensor power problems
- Engine control unit malfunction
How to Fix
- Check the integrity of the NOx sensor wiring and connectors
- Check the power supply and ground of the sensor
- Read sensor parameters via diagnostic scanner
- If necessary, replace NOx sensor A
- Check and update ECU software if necessary
Related codes
Error U029D by Vehicle Brand
FAQ
What does the U029D code mean?
U029D is an OBD-II diagnostic trouble code that indicates: Lost Communication With NOx Sensor A
What causes a U029D error code?
The most common causes of U029D include: NOx sensor A fault; Open or short circuit in the sensor circuit; Damaged or oxidized connectors; Sensor power problems.
How do I fix a U029D diagnostic trouble code?
To fix U029D: Check the integrity of the NOx sensor wiring and connectors. Check the power supply and ground of the sensor. Read sensor parameters via diagnostic scanner. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U029D?
Yes, but get it checked soon
How much does it cost to fix U029D?
The estimated repair cost for U029D is $167–444. Actual cost depends on your vehicle, location, and labor rates.
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