AutoCodes – Chevrolet – U029D 2015 Chevrolet Silverado

U029D 2015 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 2015 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 674

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 2015 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 2015 Chevrolet Silverado - Lost Communication with NOX Sensor Module 1 Malfunction - AutoCodes.com — U029D 2015 Chevrolet Silverado Code - Lost Communication with NOX Sensor Module 1 Malfunction

What does this mean?

What are the Possible Causes of the DTC U029D 2015 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 2015 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 2015 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 2015 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 2015 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code U029D in a 2015 Chevrolet Silverado?

- Common symptoms include the check engine light coming on, reduced engine performance, and potential issues with emissions control.

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

- This code indicates a communication problem between the vehicle's onboard computer and the NOx (nitrogen oxide) sensor module, which is responsible for monitoring emissions.

3. What are some possible causes of the U029D code in a 2015 Chevrolet Silverado?

- Potential causes include a faulty NOx sensor module, damaged wiring or connectors, a software glitch, or issues with the vehicle's computer system.

4. How can I diagnose the U029D code in my 2015 Chevrolet Silverado?

- Diagnosing this code typically involves using a diagnostic scanner to retrieve the specific fault codes, checking the wiring and connectors for any visible damage, and testing the NOx sensor module for proper functionality.

5. Can I continue driving my 2015 Chevrolet Silverado with the U029D code present?

- It is not recommended to continue driving with this code active, as it can lead to potential emissions issues and reduced engine performance. It is best to address the problem as soon as possible.

6. How can I repair the U029D code in my 2015 Chevrolet Silverado?

- Repair options may include replacing the NOx sensor module, repairing any damaged wiring or connectors, updating the vehicle's software, or seeking assistance from a qualified mechanic for further diagnosis.

7. Are there any DIY tips for fixing the U029D code in a 2015 Chevrolet Silverado?

- While some basic checks like inspecting wiring connections can be done DIY, resolving the U029D code may require specialized tools and expertise, so it's advisable to consult a professional mechanic.

8. How much does it typically cost to repair the U029D code in a 2015 Chevrolet Silverado?

- The cost of repair can vary depending on the exact cause of the issue, but it may involve parts and labor expenses ranging from a few hundred to over a thousand dollars.

9. Can resetting the check engine light clear the U029D code in a 2015 Chevrolet Silverado?

- Resetting the check engine light may temporarily clear the code, but if the underlying issue causing the U029D code is not addressed, the light is likely to come back on.

10. Is the U029D code a common problem in 2015 Chevrolet Silverado vehicles?

- While the U029D code specifically related to the NOx sensor module communication issue may not be extremely common, issues with emissions components can arise in various vehicles, including the 2015 Chevrolet Silverado.