AutoCodes – Chevrolet – U029D 2016 Chevrolet Silverado

U029D 2016 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 2016 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 363

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 U029D 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 U029D 2016 Chevrolet Silverado - Lost Communication with NOX Sensor Module 1 Malfunction - AutoCodes.com — U029D 2016 Chevrolet Silverado Code - Lost Communication with NOX Sensor Module 1 Malfunction

What does this mean?

What are the Possible Causes of the DTC U029D 2016 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 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 U029D 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 U029D 2016 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 U029D 2016 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code U029D in a 2016 Chevrolet Silverado?

- Common symptoms include the check engine light coming on, reduced engine performance, and potential issues with the vehicle's emissions system.

2. What does the OBDII code U029D "Lost Communication with NOX Sensor Module 1 Malfunction" indicate?

- This code indicates a communication problem between the engine control module (ECM) and the NOx sensor module, specifically Module 1.

3. What are the possible causes of the U029D code in a 2016 Chevrolet Silverado?

- The code U029D can be triggered by issues such as a faulty NOx sensor, damaged wiring or connectors, a defective ECM, or software-related problems.

4. How can I diagnose the U029D code in my 2016 Chevrolet Silverado?

- Diagnosing the U029D code typically involves using a diagnostic scanner to retrieve the fault codes, inspecting the wiring and connectors for damage, and testing the NOx sensor and related components.

5. Can I continue driving my Chevrolet Silverado with the U029D code present?

- It is not recommended to continue driving your vehicle with the U029D code present, as it can lead to potential engine performance issues and may affect emissions output.

6. How can I repair the "Lost Communication with NOX Sensor Module 1 Malfunction" issue in my 2016 Chevrolet Silverado?

- Repairing the U029D code may involve replacing the faulty NOx sensor, repairing damaged wiring or connectors, reprogramming the ECM, or addressing any software-related issues.

7. Is it possible to reset the U029D code in a 2016 Chevrolet Silverado without repairing the underlying issue?

- While you can clear the U029D code with a diagnostic scanner, it is crucial to address the root cause of the problem to prevent the code from reappearing.

8. Are there any recalls or technical service bulletins related to the U029D code in 2016 Chevrolet Silverado models?

- It is advisable to check with a Chevrolet dealership or visit the National Highway Traffic Safety Administration (NHTSA) website to see if there are any relevant recalls or technical service bulletins related to the U029D code.

9. How much can I expect to pay to repair the U029D code in my 2016 Chevrolet Silverado?

- The cost of repairing the U029D code can vary depending on the specific issue causing the malfunction. It is recommended to consult a professional mechanic for an accurate diagnosis and cost estimate.

10. Will fixing the U029D code improve the overall performance and fuel efficiency of my 2016 Chevrolet Silverado?

- Addressing the U029D code and repairing the underlying issue can potentially improve the vehicle's performance, fuel efficiency, and overall emissions output.