AutoCodes – Chrysler – U029E Chrysler

U029E Chrysler Code - Lost Communication With NOX Sensor 'B'

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 'B', Nitrogen Oxide (NOx) Sensor Bank 'B' 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: U029E Chrysler indicates Lost Communication With NOX Sensor 'B'.
Common causes: Common causes include Low Battery Voltage, Faulty Nitrogen Oxide (NOx) Sensor Bank 'B', Nitrogen Oxide (NOx) Sensor Bank 'B' 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 767

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 U029E Chrysler 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 U029E Chrysler - Lost Communication With NOX Sensor 'B' - AutoCodes.com — U029E Chrysler Code - Lost Communication With NOX Sensor 'B'

What does this mean?

What are the Possible Causes of the DTC U029E Chrysler?

Low Battery Voltage
Faulty Nitrogen Oxide (NOx) Sensor Bank 'B'
Nitrogen Oxide (NOx) Sensor Bank 'B' harness is open or shorted
Nitrogen Oxide (NOx) Sensor Bank 'B' circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC U029E Chrysler?

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 U029E Chrysler 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 U029E Chrysler Code

What does OBDII code U029E mean for a Chrysler vehicle?

U029E indicates a lost communication with the NOX (Nitrogen Oxide) sensor 'B', suggesting that the engine control module (ECM) cannot communicate with the sensor.

What are the common symptoms of U029E in a Chrysler vehicle?

Common symptoms include check engine light illumination, decreased engine performance, increased emissions, and potential issues with fuel efficiency.

What can cause the U029E code to trigger?

Causes may include a faulty NOX sensor, damaged wiring or connectors, issues with the ECM, or problems with the vehicleâ€™s communication network.

How can I diagnose the U029E code?

Start by checking for other related trouble codes, inspect the NOX sensor and its wiring for damage, and ensure all connections are secure. Use a scan tool to monitor data from the NOX sensor.

What are some effective repair tips for U029E?

Repair tips include replacing the NOX sensor if faulty, repairing or replacing damaged wiring or connectors, and ensuring that the ECM is functioning properly and has the latest software updates.

Can I drive my Chrysler with the U029E code?

While you can drive the vehicle, it is not recommended as it may lead to poor performance and increased emissions. It's best to have the issue diagnosed and repaired as soon as possible.

Is U029E a serious issue that requires immediate attention?

Yes, U029E can lead to performance issues and increased emissions, so it should be addressed promptly to avoid further complications.

How much does it typically cost to repair U029E?

Repair costs can vary widely depending on the cause, but expect to pay anywhere from $100 to $500 for repairs, including parts and labor.

Can a faulty NOX sensor affect my vehicle's emissions?

Yes, a malfunctioning NOX sensor can lead to improper readings, resulting in increased emissions and potential failure of emissions tests.

Will clearing the U029E code fix the problem?

Clearing the code may temporarily turn off the check engine light, but it will not fix the underlying issue. The code is likely to return if the problem is not resolved.