AutoCodes – Chevrolet – U029D 2017 Chevrolet Silverado

U029D 2017 Chevrolet Silverado Code - Lost Communication with NOX Sensor Module 1 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 1, Nitrogen Oxide Sensor Module 1 harness is open or shorted, Nitrogen Oxide Sensor Module 1 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: U029D 2017 Chevrolet Silverado indicates Lost Communication with NOX Sensor Module 1 Malfunction.
Common causes: Common causes include Faulty Nitrogen Oxide (NOx) Sensor Module 1, Nitrogen Oxide Sensor Module 1 harness is open or shorted, Nitrogen Oxide Sensor Module 1 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 441

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 U029D 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 U029D 2017 Chevrolet Silverado - Lost Communication with NOX Sensor Module 1 Malfunction - AutoCodes.com — U029D 2017 Chevrolet Silverado Code - Lost Communication with NOX Sensor Module 1 Malfunction

What does this mean?

What are the Possible Causes of the DTC U029D 2017 Chevrolet Silverado?

Faulty Nitrogen Oxide (NOx) Sensor Module 1
Nitrogen Oxide Sensor Module 1 harness is open or shorted
Nitrogen Oxide Sensor Module 1 circuit poor electrical connection

How to Fix the DTC U029D 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 U029D 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 U029D 2017 Chevrolet Silverado code?

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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 U029D 2017 Chevrolet Silverado Code

1. What are common symptoms of OBDII code U029D in a 2017 Chevrolet Silverado?

- Common symptoms include the Check Engine Light coming on, poor engine performance, reduced fuel efficiency, and potential issues with the emissions system.

2. What does the OBDII code U029D "Lost Communication with NOX Sensor Module 1 Malfunction" mean for a 2017 Chevrolet Silverado?

- This code indicates a communication problem between the engine control module (ECM) and the NOx (nitrogen oxide) sensor module, which can lead to performance issues and emissions concerns.

3. What are possible causes of the U029D code in a 2017 Chevrolet Silverado?

- Possible causes include faulty NOx sensor module, wiring or connection issues, ECM software glitches, or a malfunctioning ECM itself.

4. How can I diagnose the U029D code in my 2017 Chevrolet Silverado?

- Diagnosing the U029D code may require using an OBDII scanner to retrieve the code and further testing to pinpoint the exact cause, such as checking the connections, inspecting the sensor module, or testing the ECM.

5. What are the repair options for fixing the U029D code in a 2017 Chevrolet Silverado?

- Repair options may include replacing the NOx sensor module, repairing or replacing damaged wiring, updating the ECM software, or replacing the ECM if necessary.

6. Can I drive my 2017 Chevrolet Silverado with the U029D code?

- It is not recommended to drive the vehicle with the U029D code active, as it can lead to performance issues and potential damage to the emissions system. It's best to address the issue promptly.

7. How much does it typically cost to repair the U029D code in a 2017 Chevrolet Silverado?

- Repair costs can vary depending on the exact cause of the issue and the necessary repairs. Costs may range from a few hundred to over a thousand dollars, including parts and labor.

8. Are there any preventative maintenance tips to avoid the U029D code in a 2017 Chevrolet Silverado?

- Regularly inspecting and maintaining the emissions system, checking wiring connections, and ensuring timely software updates for the ECM can help prevent issues leading to the U029D code.

9. Can a DIY enthusiast fix the U029D code issue in a 2017 Chevrolet Silverado?

- While some basic troubleshooting and repairs may be possible for DIY enthusiasts, diagnosing and fixing the U029D code often requires specialized tools and expertise, so professional help is recommended.

10. How urgent is it to address the U029D code in a 2017 Chevrolet Silverado?

- It is important to address the U029D code promptly to prevent further damage to the vehicle's emissions system and ensure optimal engine performance. Ignoring the issue can lead to more costly repairs down the line.