AutoCodes – GMC – U02A3 2014 GMC Sierra

U02A3 2014 GMC Sierra Code - Lost Communication With Particulate Matter Sensor Module

Quick Answer

Devices connected to the Powertrain High-Speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Exhaust Particulate Matter Sensor, Exhaust Particulate Matter Sensor harness is open or shorted, Exhaust Particulate Matter Sensor 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: U02A3 2014 GMC Sierra indicates Lost Communication With Particulate Matter Sensor Module.
Common causes: Common causes include Faulty Exhaust Particulate Matter Sensor, Exhaust Particulate Matter Sensor harness is open or shorted, Exhaust Particulate Matter Sensor 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 195

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

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 U02A3 2014 GMC Sierra Description

Devices connected to the Powertrain High-Speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the devices. The devices have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver device as an availability indication of the transmitter device. Each message contains the identification number of the transmitter device. A loss of serial data communications Diagnostic Trouble Code (DTC) does not represent a failure of the devices that contain the stored DTC. The DTC will be set when a supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U02A3 2014 GMC Sierra - Lost Communication With Particulate Matter Sensor Module - AutoCodes.com — U02A3 2014 GMC Sierra Code - Lost Communication With Particulate Matter Sensor Module

What does this mean?

What are the Possible Causes of the DTC U02A3 2014 GMC Sierra?

Faulty Exhaust Particulate Matter Sensor
Exhaust Particulate Matter Sensor harness is open or shorted
Exhaust Particulate Matter Sensor circuit poor electrical connection

How to Fix the DTC U02A3 2014 GMC Sierra?

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 U02A3 2014 GMC Sierra 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 U02A3 2014 GMC Sierra code?

Need more information on how to fix the U02A3 2014 GMC Sierra 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 U02A3 2014 GMC Sierra Code

1. What are the common symptoms of the U02A3 OBDII code in a 2014 GMC Sierra?

Common symptoms include engine performance issues, rough idling, decreased fuel efficiency, and the illumination of the check engine light.

2. What does the U02A3 OBDII code "Lost Communication With Particulate Matter Sensor Module" mean in a 2014 GMC Sierra?

This code indicates that the vehicle's onboard computer is unable to communicate with the particulate matter sensor module.

3. What are the possible causes of the U02A3 OBDII code in a 2014 GMC Sierra?

Possible causes include a faulty particulate matter sensor module, damaged wiring or connectors, software issues, or a malfunctioning powertrain control module.

4. How can I diagnose the U02A3 OBDII code in my 2014 GMC Sierra?

Diagnosis involves checking the connections to the particulate matter sensor module, inspecting the wiring for damage, and using a diagnostic scanner to communicate with the module and check for any stored fault codes.

5. Can I continue driving my 2014 GMC Sierra with the U02A3 OBDII code?

It is not recommended to continue driving with this code present, as it can affect the vehicle's performance and emissions. It's best to address the issue promptly to prevent further damage.

6. How can I repair the U02A3 OBDII code in my 2014 GMC Sierra?

Repair options include replacing the faulty particulate matter sensor module, repairing any damaged wiring or connectors, updating the software, or reprogramming the powertrain control module.

7. Is it possible to reset the U02A3 OBDII code in a 2014 GMC Sierra without making any repairs?

While clearing the code may temporarily turn off the check engine light, it will likely reappear if the underlying issue is not addressed. It is recommended to diagnose and repair the problem to prevent future occurrences.

8. Can a DIY enthusiast resolve the U02A3 OBDII code issue in a 2014 GMC Sierra?

Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to diagnose and repair the issue themselves. However, working with sensors and modules may require specialized knowledge and equipment.

9. How much does it typically cost to repair the U02A3 OBDII code in a 2014 GMC Sierra?

The cost of repairs can vary depending on the specific cause of the issue, labor rates, and whether new parts are needed. It's advisable to obtain quotes from reputable mechanics or dealerships for an accurate estimate.

10. Is the U02A3 OBDII code a common issue in 2014 GMC Sierra vehicles?

While not as common as some other codes, the U02A3 code can still occur in 2014 GMC Sierra vehicles due to sensor or communication module failures. Regular maintenance and prompt attention to warning lights can help prevent such issues.