AutoCodes – Chevrolet – U029E 2015 Chevrolet Silverado

U029E 2015 Chevrolet Silverado Code - Lost Communication with NOX Sensor Module 2 Malfunction

Quick Answer

The reductant system uses two Nitrogen Oxide (NOx) sensors to monitor the amount of NOx in the engine's exhaust gas. Common causes include Faulty Nitrogen Oxide (NOx) Sensor Module 2, Nitrogen Oxide Sensor Module 2 harness is open or shorted, Nitrogen Oxide Sensor Module 2 circuit poor electrical connection. 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 2015 Chevrolet Silverado indicates Lost Communication with NOX Sensor Module 2 Malfunction.
Common causes: Common causes include Faulty Nitrogen Oxide (NOx) Sensor Module 2, Nitrogen Oxide Sensor Module 2 harness is open or shorted, Nitrogen Oxide Sensor Module 2 circuit poor electrical connection.
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 394

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Oct 18, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U029E 2015 Chevrolet Silverado Description

The reductant system uses two Nitrogen Oxide (NOx) sensors to monitor the amount of NOx in the engine's exhaust gas. The first sensor is located at the outlet of the turbocharger and monitors the engine out NOx level. The second NOx sensor is located between the Selective Catalytic Reduction (SCR) and the Diesel Particulate Filter (DPF) and monitors NOx levels downstream of the SCR. The second NOx sensor also provides the Engine Control Module (ECM) with information on the exhaust oxygen level during DPF regeneration.
Each NOx sensor contains a sensing cell, a pumping cell, and a heater. A sample of exhaust gas passes through a diffusion gap between the sensing cell and the pumping cell. The NOx sensor maintains a constant reference voltage across the sensing cell. An electronic circuit within sensor controls the pump current through the pumping cell in order to maintain a constant voltage in the sensing cell. The amount of current required to maintain the reference voltage in the sensing cell is proportional to the concentration of NOx in the exhaust.
The ECM varies the amount of Diesel Exhaust Fluid (DEF) or reductant added by varying the reductant injector duty cycle in response to changes in engine exhaust out NOx levels. The smart NOx sensors consist of two components, the NOx module and the NOx sensor element that are serviced as a unit. A circuit or performance condition with a NOx sensor is detected by the NOx sensor module. The smart NOx sensor module communicates the condition to the ECM over the serial data line. The ECM sets a DTC when a serial data message is received from the NOx sensor module.

OBDII Code U029E 2015 Chevrolet Silverado - Lost Communication with NOX Sensor Module 2 Malfunction - AutoCodes.com — U029E 2015 Chevrolet Silverado Code - Lost Communication with NOX Sensor Module 2 Malfunction

What does this mean?

What are the Possible Causes of the DTC U029E 2015 Chevrolet Silverado?

Faulty Nitrogen Oxide (NOx) Sensor Module 2
Nitrogen Oxide Sensor Module 2 harness is open or shorted
Nitrogen Oxide Sensor Module 2 circuit poor electrical connection

How to Fix the DTC U029E 2015 Chevrolet Silverado?

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 2015 Chevrolet Silverado 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.

Need more information about the U029E 2015 Chevrolet Silverado code?

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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 2015 Chevrolet Silverado Code

1. What are common symptoms of the U029E OBDII code in a 2015 Chevrolet Silverado?

- Common symptoms include the check engine light illuminating, poor engine performance, reduced fuel efficiency, and potential issues with emission control.

2. What does the U029E code "Lost Communication with NOX Sensor Module 2 Malfunction" indicate in a 2015 Chevrolet Silverado?

- This code indicates a communication problem between the engine control module (ECM) and the NOX (nitrogen oxide) sensor module 2, which helps monitor and control emissions.

3. What are possible causes of the U029E code in a 2015 Chevrolet Silverado?

- Possible causes include a faulty NOX sensor module, damaged wiring or connectors, a software glitch, or issues with the ECM communication network.

4. How can I diagnose the U029E code in my 2015 Chevrolet Silverado?

- Diagnosing the U029E code may involve checking the NOX sensor module connections, inspecting wiring for damage, performing ECM scans for communication errors, and testing the NOX sensor functionality.

5. Can I continue driving my 2015 Chevrolet Silverado with the U029E code present?

- It is not recommended to continue driving with the U029E code active, as it can lead to increased emissions, reduced engine efficiency, and potential damage to other components over time.

6. How can I repair the U029E code in my 2015 Chevrolet Silverado?

- Repairing the U029E code may involve replacing the NOX sensor module, repairing damaged wiring or connectors, updating the ECM software, or resetting the fault codes after fixing any underlying issues.

7. Is it necessary to reset the U029E code after repairing the problem in a 2015 Chevrolet Silverado?

- Yes, it is important to reset the code using an OBDII scanner after addressing the underlying cause to clear the fault codes and turn off the check engine light.

8. Are there any DIY tips for addressing the U029E code in a 2015 Chevrolet Silverado?

- While some basic checks like inspecting connections and wiring can be done DIY, diagnosing and repairing the U029E code may require professional equipment and expertise due to the complexity of the emissions system.

9. How much does it typically cost to repair the U029E code in a 2015 Chevrolet Silverado?

- The cost of repairing the U029E code can vary depending on the underlying issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

10. Can the U029E code reoccur after it has been repaired in a 2015 Chevrolet Silverado?

- If the underlying cause of the U029E code is not fully addressed, it is possible for the code to reoccur. Regular maintenance and proper diagnostics can help prevent its recurrence.