AutoCodes – Chevrolet – U029E 2014 Chevrolet Silverado

U029E 2014 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 2014 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 348

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 2014 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 2014 Chevrolet Silverado - Lost Communication with NOX Sensor Module 2 Malfunction - AutoCodes.com — U029E 2014 Chevrolet Silverado Code - Lost Communication with NOX Sensor Module 2 Malfunction

What does this mean?

What are the Possible Causes of the DTC U029E 2014 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 2014 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 2014 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 2014 Chevrolet Silverado code?

Need more information on how to fix the U029E 2014 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the 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 2014 Chevrolet Silverado Code

1. What does the OBDII code U029E mean for a 2014 Chevrolet Silverado?

The code U029E indicates a "Lost Communication with NOX Sensor Module 2 Malfunction" in a 2014 Chevrolet Silverado.

2. What are the common symptoms of a U029E code in a 2014 Chevrolet Silverado?

Common symptoms of the U029E code may include poor engine performance, decreased fuel efficiency, and the illumination of the check engine light.

3. What are the possible causes of a U029E code in a 2014 Chevrolet Silverado?

Potential causes of the U029E code include a faulty NOX sensor module, damaged wiring or connectors, software issues, or a malfunctioning powertrain control module (PCM).

4. How can I diagnose a U029E code in my 2014 Chevrolet Silverado?

Diagnosing a U029E code typically involves using an OBDII scanner to retrieve the code, inspecting the NOX sensor module and related wiring for damage, and checking for any loose connections.

5. Can I continue driving my 2014 Chevrolet Silverado with a U029E code?

It is not recommended to drive your vehicle with a U029E code present, as it may lead to further damage and potential safety hazards. It's best to address the issue promptly.

6. How can I repair a U029E code in my 2014 Chevrolet Silverado?

Repairing a U029E code may involve replacing the NOX sensor module, repairing or replacing damaged wiring or connectors, updating software, or resetting the PCM.

7. Is it possible to reset a U029E code in a 2014 Chevrolet Silverado without repairing the issue?

While you can clear the code with an OBDII scanner, the underlying issue causing the U029E code will still persist until properly diagnosed and repaired.

8. How much does it typically cost to repair a U029E code in a 2014 Chevrolet Silverado?

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

9. Can a U029E code in a 2014 Chevrolet Silverado cause emissions test failure?

Yes, a U029E code can potentially cause your 2014 Chevrolet Silverado to fail emissions testing, as it indicates a malfunction related to emissions control systems.

10. How can I prevent a U029E code from occurring in my 2014 Chevrolet Silverado?

To prevent a U029E code, it's essential to follow the manufacturer's recommended maintenance schedule, address any check engine light issues promptly, and ensure proper care of your vehicle's emission control components.