AutoCodes – GMC – U02A3 GMC

U02A3 GMC 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 GMC 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 2,590

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

What does this mean?

What are the Possible Causes of the DTC U02A3 GMC?

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 GMC?

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 GMC 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 GMC code?

Need more information on how to fix the U02A3 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U02A3 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

U02A3 2014 GMC Sierra — Lost Communication With Particulate Matter Sensor Module
U02A3 2015 GMC Sierra — Lost Communication With Particulate Matter Sensor Module
U02A3 2016 GMC Sierra — Lost Communication With Particulate Matter Sensor Module
U02A3 2017 GMC Sierra — Lost Communication With Particulate Matter Sensor Module
U02A3 2018 GMC Sierra — Lost Communication With Particulate Matter Sensor Module

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 GMC Code

1. What are common symptoms of the U02A3 GMC OBDII code?

- Common symptoms include the check engine light coming on, reduced engine performance, and potential issues with the particulate matter sensor system.

2. What could cause the U02A3 GMC code indicating lost communication with the particulate matter sensor module?

- Possible causes include a faulty particulate matter sensor module, wiring issues, corrosion in the connections, or a malfunction in the vehicle's electronic control module.

3. How can I diagnose the U02A3 GMC code related to lost communication with the particulate matter sensor module?

- Diagnosis involves using a scan tool to retrieve the trouble codes, checking the wiring and connections to the particulate matter sensor module, and testing the sensor module itself for proper functioning.

4. Can I continue driving my vehicle with the U02A3 GMC OBDII code present?

- It is not recommended to continue driving with this code present, as it can lead to reduced engine performance and potential emissions system issues. It's best to address the problem promptly.

5. Is it possible to repair the U02A3 GMC code issue myself?

- Depending on your experience and tools, you may be able to address the issue yourself by checking the wiring, connections, and sensor module for any visible damage or corrosion. However, professional diagnosis and repair may be necessary.

6. Are there any quick fixes or temporary solutions for the U02A3 GMC code?

- Quick fixes are not recommended for this code, as it indicates a communication issue that needs to be properly diagnosed and repaired to ensure the vehicle operates correctly and complies with emissions regulations.

7. How much does it typically cost to repair the U02A3 GMC OBDII code?

- The cost of repair can vary depending on the underlying cause of the code, the labor rates in your area, and whether you choose to address the issue yourself or take it to a professional mechanic. It's advisable to get a few quotes for an accurate estimate.

8. Can the U02A3 GMC code be triggered by other related issues in the vehicle?

- Yes, other issues such as wiring harness damage, faulty sensors in the emissions system, or problems with the vehicle's electronic control module can potentially trigger the U02A3 code.

9. How important is it to fix the U02A3 GMC code indicating lost communication with the particulate matter sensor module?

- It is essential to address this code promptly to prevent any further damage to the emissions system, ensure optimal engine performance, and maintain compliance with emissions regulations.

10. Will resetting the OBDII system clear the U02A3 GMC code?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing the lost communication with the particulate matter sensor module is not fixed, the code is likely to reappear.