AutoCodes – Chevrolet – U029E 2016 Chevrolet Silverado

U029E 2016 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 2016 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 490

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 2016 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 2016 Chevrolet Silverado - Lost Communication with NOX Sensor Module 2 Malfunction - AutoCodes.com — U029E 2016 Chevrolet Silverado Code - Lost Communication with NOX Sensor Module 2 Malfunction

What does this mean?

What are the Possible Causes of the DTC U029E 2016 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 2016 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 2016 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 2016 Chevrolet Silverado code?

Need more information on how to fix the U029E 2016 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 2016 Chevrolet Silverado Code

1. What does the OBDII code U029E on a 2016 Chevrolet Silverado indicate?

- The code U029E signals a "Lost Communication with NOX Sensor Module 2 Malfunction" in the vehicle's onboard diagnostics system.

2. What are the common symptoms of a U029E code in a 2016 Chevrolet Silverado?

- Common symptoms include the malfunction indicator light (MIL) turning on, reduced engine performance, and potential issues with emissions control.

3. What could cause the U029E code in a 2016 Chevrolet Silverado?

- Possible causes include a faulty NOX sensor module, damaged wiring or connectors, software issues, or a communication breakdown within the vehicle's network.

4. How can I diagnose the U029E code in my 2016 Chevrolet Silverado?

- Diagnosing the U029E code typically involves using an OBDII scanner to retrieve the specific fault codes, checking the NOX sensor module and related components for damage, and inspecting the wiring for any issues.

5. Is it safe to continue driving with a U029E code in a 2016 Chevrolet Silverado?

- It is generally not recommended to drive the vehicle with a U029E code active, as it can lead to potential engine performance issues and affect emissions compliance.

6. Can I repair the U029E code in my 2016 Chevrolet Silverado myself?

- While some basic checks like inspecting wiring connections can be done by DIY enthusiasts, resolving the U029E code may require specialized equipment and expertise, so professional help is often recommended.

7. How much does it cost to fix a U029E code in a 2016 Chevrolet Silverado?

- The cost of fixing a U029E code can vary depending on the root cause of the issue. It's advisable to consult a professional technician for an accurate diagnosis and cost estimate.

8. Will resetting the trouble codes make the U029E code disappear in a 2016 Chevrolet Silverado?

- Resetting the trouble codes may temporarily clear the MIL, but if the underlying issue causing the U029E code is not resolved, the code is likely to reappear after driving cycles.

9. Can a U029E code in a 2016 Chevrolet Silverado cause other problems if left unaddressed?

- Ignoring a U029E code can potentially lead to more severe engine performance issues, increased emissions, and could impact the vehicle's overall drivability and efficiency.

10. How often does a U029E code occur in a 2016 Chevrolet Silverado?

- The U029E code is not extremely common but can occur due to various factors such as sensor malfunctions, wiring problems, or communication errors within the vehicle's systems.