AutoCodes – RAM – U02A2 RAM

U02A2 RAM 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 RAM 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 5,525

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

What does this mean?

What are the Possible Causes of the DTC U02A2 RAM?

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 RAM?

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 RAM 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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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 RAM 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, reduced engine performance, and potential issues with the vehicle's emission system.

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 circuit, software issues, or a malfunction in the vehicle's control module.

3. How can I diagnose the OBDII code U02A2?

- Diagnosis typically involves using a scan tool to retrieve the code, checking the communication circuit for faults, inspecting the reductant quality module, and verifying proper connections.

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

- It is not recommended to drive the vehicle with the U02A2 code present, as it could lead to further damage or emissions issues. It's best to address the issue promptly.

5. How can I repair OBDII code U02A2?

- Repair options may include replacing the reductant quality module, repairing damaged wiring or connectors, updating software, or seeking assistance from a professional mechanic to diagnose and fix the issue.

6. Is the U02A2 code related to emissions control?

- Yes, the U02A2 code is related to the vehicle's emissions control system, specifically communication issues with the reductant quality module responsible for managing emissions.

7. Will resetting the check engine light resolve the U02A2 code?

- Resetting the check engine light may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear. It's important to diagnose and repair the problem causing the code.

8. Can a DIY enthusiast fix the U02A2 code at home?

- Depending on the cause of the code, some DIY enthusiasts may be able to address the U02A2 code at home by following proper diagnostic procedures and repair steps. However, complex issues may require professional assistance.

9. How urgent is it to address the U02A2 code?

- It is recommended to address the U02A2 code promptly to prevent potential damage to the vehicle, ensure proper emission control, and maintain optimal engine performance.

10. Are there any recalls related to the U02A2 OBDII code?

- As recalls can vary by vehicle make and model, it's advisable to check with the manufacturer or authorized dealerships for any recalls specifically related to the U02A2 OBDII code and the reductant quality module.