AutoCodes – Generic – U02A2

U02A2 Code - Lost Communication With Reductant Quality Module

Quick Answer

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Common causes include Faulty Reductant Quality Module, Reductant Quality Module harness is open or shorted, Reductant Quality Module 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: U02A2 indicates Lost Communication With Reductant Quality Module.
Common causes: Common causes include Faulty Reductant Quality Module, Reductant Quality Module harness is open or shorted, Reductant Quality Module 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 15,651

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 Apr 07, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U02A2 Description

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Operating information and commands are exchanged among the devices. The devices have programmed information about what messages are needed to be exchanged on the serial data circuits. CAN bus uses two dedicated wires for communication. The wires are called CAN high and CAN low. When the CAN bus is in idle mode, both lines carry 2.5V. When data bits are being transmitted, the CAN high line goes to 3.75V, and the CAN low drops to 1.25V, thereby generating a 2.5V differential between the lines. Since communication relies on a voltage differential between the two bus lines, the CAN bus is NOT sensitive to inductive spikes, electrical fields, or other noise. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Reductant Quality Module has not been received.

OBDII Code U02A2 - Lost Communication With Reductant Quality Module - AutoCodes.com — U02A2 Code - Lost Communication With Reductant Quality Module

What does this mean?

What are the Possible Causes of the DTC U02A2?

Faulty Reductant Quality Module
Reductant Quality Module harness is open or shorted
Reductant Quality Module circuit poor electrical connection

How to Fix the DTC U02A2?

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 U02A2 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.

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Information for Specific Makes

U02A2 Chrysler — Lost Communication With Reductant Quality Module
U02A2 Dodge — Lost Communication With Reductant Quality Module
U02A2 Ford — Lost Communication With Reductant Quality Module
U02A2 Jeep — Lost Communication With Reductant Quality Module
U02A2 Lincoln — Lost Communication With Reductant Quality Module
U02A2 Mercury — Lost Communication With Reductant Quality Module
U02A2 RAM — Lost Communication With Reductant Quality 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 U02A2 Code

1. What are the common symptoms of OBDII code U02A2 (Lost Communication With Reductant Quality Module)?

- Common symptoms include the check engine light illuminating on the dashboard, reduced engine power, and potential difficulty in starting the vehicle.

2. What are some possible causes of OBDII code U02A2?

- Possible causes include a faulty reductant quality module, damaged wiring or connectors in the communication network, or issues with the powertrain control module (PCM).

3. How can I diagnose the root cause of OBDII code U02A2?

- Diagnosis typically involves using a diagnostic scanner to retrieve the code, checking the wiring and connectors related to the reductant quality module, and performing a communication network test.

4. Can I still drive my vehicle with OBDII code U02A2 present?

- It is generally not recommended to continue driving the vehicle with this code present, as it can lead to performance issues and potentially cause further damage to the engine or emission system.

5. How can I repair OBDII code U02A2 (Lost Communication With Reductant Quality Module)?

- Repair options may include replacing the faulty reductant quality module, repairing any damaged wiring or connectors, or reprogramming the PCM to establish communication with the module.

6. Is resetting the check engine light a temporary solution for OBDII code U02A2?

- Resetting the check engine light may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear once the vehicle is driven and the system performs self-tests.

7. Can a DIY enthusiast fix OBDII code U02A2 at home?

- Depending on the root cause, some DIY enthusiasts may be able to address OBDII code U02A2 by checking wiring connections, replacing modules, or performing basic troubleshooting steps. However, complex diagnostic procedures may require professional assistance.

8. Are there any recalls or technical service bulletins related to OBDII code U02A2?

- It is advisable to check with the vehicle manufacturer or authorized service centers for any recalls or technical service bulletins related to OBDII code U02A2, as they may provide relevant information or solutions.

9. How long does it typically take to repair OBDII code U02A2?

- The repair time for OBDII code U02A2 can vary depending on the specific cause of the issue, availability of parts, and the expertise of the technician. In some cases, repairs can be completed within a few hours, while complex issues may take longer.

10. What are the potential risks of ignoring OBDII code U02A2?

- Ignoring OBDII code U02A2 can lead to poor engine performance, reduced fuel efficiency, and potential damage to emission control components. It is essential to address this code promptly to prevent further issues.