AutoCodes – Dodge – U029D Dodge

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

Quick Answer

The aftertreatment system is equipped with two NOx Sensors and modules. Common causes include Low Battery Voltage, Faulty Nitrogen Oxide (NOx) Sensor Bank 'A', Nitrogen Oxide (NOx) Sensor Bank 'A' harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: U029D Dodge indicates Lost Communication With NOX Sensor 'A'.
Common causes: Common causes include Low Battery Voltage, Faulty Nitrogen Oxide (NOx) Sensor Bank 'A', Nitrogen Oxide (NOx) Sensor Bank 'A' harness is open or shorted.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 1,710

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 07, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U029D Dodge Description

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.

OBDII Code U029D Dodge - Lost Communication With NOX Sensor 'A' - AutoCodes.com — U029D Dodge Code - Lost Communication With NOX Sensor 'A'

What does this mean?

What are the Possible Causes of the DTC U029D Dodge?

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)

How to Fix the DTC U029D Dodge?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U029D Dodge code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about U029D Dodge Code

What does the OBDII code U029D mean on a Dodge vehicle?

1. The U029D code indicates a lost communication with NOx Sensor 'A,' which monitors nitrogen oxide levels in the exhaust system. 2.

What are the common symptoms of the U029D code on a Dodge?

Common symptoms include the check engine light turning on, reduced engine performance, increased emissions, or issues with the exhaust aftertreatment system. 3.

What causes the U029D code to appear on a Dodge?

The code can be caused by faulty NOx Sensor 'A,' damaged wiring or connectors, a software issue in the engine control module (ECM), or a blown fuse. 4.

How do I diagnose the U029D code on my Dodge vehicle?

Start by checking the wiring and connectors to NOx Sensor 'A' for damage, inspect the fuse, and use a diagnostic scanner to verify communication with the sensor. 5.

Can I drive my Dodge with the U029D code active?

While the vehicle might still be drivable, continuing to drive with this code can lead to reduced fuel efficiency, increased emissions, or potential damage to the emissions system. 6.

How do I fix the U029D code on a Dodge?

Repairs can include replacing the faulty NOx sensor, repairing damaged wiring or connectors, updating the ECM software, or replacing a blown fuse. 7.

How much does it cost to fix the U029D code on a Dodge?

The repair cost can vary, but replacing the NOx sensor typically costs between $300 and $700, including parts and labor. 8.

Can a U029D code be triggered by a software issue?

Yes, outdated or corrupted ECM software can sometimes cause communication errors like the U029D code. 9.

What tools do I need to diagnose a U029D code?

You'll need a diagnostic scanner capable of reading OBDII codes and possibly a multimeter to check wiring continuity and voltage. 10.

Is the U029D code specific to Dodge vehicles?

No, the U029D code is a generic OBDII code that can appear on various makes and models, but the diagnosis and repair process may vary slightly for Dodge vehicles.