AutoCodes – Chevrolet – U029E 2017 Chevrolet Silverado

U029E 2017 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 2017 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 428

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
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Code U029E 2017 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 2017 Chevrolet Silverado - Lost Communication with NOX Sensor Module 2 Malfunction - AutoCodes.com — U029E 2017 Chevrolet Silverado Code - Lost Communication with NOX Sensor Module 2 Malfunction

What does this mean?

What are the Possible Causes of the DTC U029E 2017 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 2017 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 2017 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 2017 Chevrolet Silverado code?

Need more information on how to fix the U029E 2017 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 2017 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code U029E in a 2017 Chevrolet Silverado?

The common symptoms of code U029E "Lost Communication with NOX Sensor Module 2 Malfunction" in a 2017 Chevrolet Silverado may include poor engine performance, reduced fuel efficiency, and the illumination of the check engine light.

2. What can cause the OBDII code U029E to trigger in a 2017 Chevrolet Silverado?

The U029E code in a 2017 Chevrolet Silverado is typically triggered by issues such as a faulty NOX sensor module, damaged wiring or connectors related to the NOX sensor, or a communication error within the vehicle's electronic control system.

3. How serious is the U029E code in a 2017 Chevrolet Silverado?

While the U029E code may not cause immediate drivability issues, it is important to address it promptly to prevent potential damage to the emissions control system and ensure optimal engine performance.

4. How can I diagnose the U029E code in my 2017 Chevrolet Silverado?

Diagnosing the U029E code requires using an OBDII scanner to retrieve the specific fault code, inspecting the NOX sensor module and its connections for any visible damage, and conducting a thorough electrical system check to identify communication faults.

5. Can I repair the U029E code in my 2017 Chevrolet Silverado at home?

Depending on your mechanical skills and access to tools, repairing the U029E code at home may be possible if the issue is related to a faulty sensor or damaged wiring. However, complex communication system failures may require professional diagnosis and repair.

6. Is it safe to continue driving my 2017 Chevrolet Silverado with the U029E code present?

While driving with the U029E code may not immediately harm your vehicle, it is advisable to address the issue promptly to prevent potential long-term damage to the emissions system and ensure optimal engine performance.

7. How much does it typically cost to repair the U029E code in a 2017 Chevrolet Silverado?

The cost of repairing the U029E code in a 2017 Chevrolet Silverado can vary depending on the underlying issue, the need for replacement parts, and labor costs. It is recommended to obtain multiple quotes from reputable repair shops for an accurate estimate.

8. Can a faulty NOX sensor cause the U029E code in a 2017 Chevrolet Silverado?

Yes, a faulty NOX sensor or issues related to the NOX sensor module can trigger the U029E code in a 2017 Chevrolet Silverado, indicating a communication breakdown or malfunction within the sensor system.

9. Will resetting the check engine light resolve the U029E code in a 2017 Chevrolet Silverado?

Simply resetting the check engine light without addressing the underlying cause of the U029E code will not resolve the issue. It is crucial to diagnose the problem, make necessary repairs, and clear the fault code using a diagnostic tool.

10. How long does it take to repair the U029E code in a 2017 Chevrolet Silverado?

The repair time for the U029E code in a 2017 Chevrolet Silverado can vary based on the complexity of the issue, the availability of parts, and the expertise of the technician. Minor repairs may take a few hours, while more involved diagnostics and fixes could require additional time.