Engine-Codes - Jeep - U029D Jeep

U029D Jeep Code - Lost Communication With NOX Sensor 'A'

- Code Popularity: 1,801 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents
ChatAC AutoCodes.com AI Chat

What are the Possible Causes of the DTC U029D Jeep?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Low Battery Voltage
  • Faulty Nitrogen Oxide (NOx) Sensor Bank 'A'
  • Nitrogen Oxide (NOx) Sensor Bank 'A' harness is open or shorted
  • Nitrogen Oxide (NOx) Sensor Bank 'A' circuit poor electrical connection
  • Faulty Powertrain Control Module (PCM)
⚠ Does your Jeep have Safety Recalls? → Check here

How to Fix the DTC U029D Jeep?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Search for U029D Jeep Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the U029D Jeep code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

What Does the U029D Jeep Code Mean?

The aftertreatment system is equipped with two NOx Sensors and modules. The upstream NOx Sensor 1/1 is located on the Turbocharger elbow downpipe and is permanently connected to a corresponding NOx Sensor Module mounted to the hot side of the engine block. The downstream NOx Sensor 1/2 is located at the outlet of the SCR Catalyst and is permanently connected to a corresponding NOx Sensor Module which is mounted on the right frame rail. The NOx Sensors and NOx Sensor Modules are calibrated to each other and must be replaced as an assembly. The two NOx Sensor and Module assemblies are not interchangeable. The NOx Sensor Modules are smart devices and communicate with the Powertrain Control Module (PCM) over the J1939 Data Link. The NOx Sensor Modules perform their own internal diagnostics and report malfunctions back to the PCM. The NOx Sensors are used to monitor the efficiency of the SCR Catalyst and dosing system. The PCM will illuminate the Malfunction Indicator Lamp (MIL) after the diagnostic runs and fails in two consecutive drive cycles. The PCM will turn off the MIL immediately after the monitor runs and passes.

U029D Jeep Code - Lost Communication With NOX Sensor 'A'

Need more Information on the Code?

Need more information on how to fix the U029D Jeep code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U029D Jeep code diagnosed by a professional: Find a repair shop in your area