AutoCodes – Jeep – U02A2 Jeep

U02A2 Jeep 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 Jeep 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,068

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

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

What does this mean?

What are the Possible Causes of the DTC U02A2 Jeep?

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 Jeep?

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 Jeep 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 U02A2 Jeep code?

Need more information on how to fix the U02A2 Jeep code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U02A2 Jeep code diagnosed by a professional: Find a repair shop in your area

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 Jeep Code

1. What are the common symptoms of OBDII code U02A2 in a Jeep related to lost communication with the Reductant Quality Module?

- Common symptoms may include the check engine light illuminating, poor fuel efficiency, reduced engine performance, and failure to pass emissions tests.

2. What are the possible causes of OBDII code U02A2 indicating lost communication with the Reductant Quality Module in a Jeep?

- Causes can include faulty wiring or connectors, a malfunctioning Reductant Quality Module, software issues, or a problem with the vehicle's main computer.

3. How can I diagnose the issue causing OBDII code U02A2 in my Jeep?

- Diagnosing the issue may involve using a diagnostic scan tool to retrieve the specific trouble codes, checking the wiring and connectors for any damage, and performing a thorough inspection of the Reductant Quality Module.

4. Can I still drive my Jeep with the U02A2 trouble code present?

- It is generally not recommended to drive a vehicle with the check engine light on, as it could lead to further damage or potential safety issues. It is best to address the underlying problem causing the code.

5. Is it possible to reset the U02A2 trouble code in my Jeep without fixing the underlying issue?

- While you can clear the trouble code with a diagnostic scan tool, the check engine light is likely to come back on if the root cause of the communication issue with the Reductant Quality Module is not addressed.

6. How much does it typically cost to repair OBDII code U02A2 in a Jeep?

- The cost of repairs can vary depending on the exact cause of the communication issue. It may involve replacing wiring, connectors, or the Reductant Quality Module itself, so costs can range from a few hundred to over a thousand dollars.

7. Can a DIY enthusiast fix the U02A2 trouble code issue in a Jeep?

- Depending on your level of automotive repair experience and access to tools, you may be able to address simpler causes like loose connections or damaged wiring. However, more complex issues may require professional diagnosis and repair.

8. Will fixing the U02A2 trouble code improve my Jeep's fuel efficiency?

- Resolving the communication issue with the Reductant Quality Module can potentially improve fuel efficiency by allowing the engine to operate optimally and maintain proper emissions control.

9. Are there any preventive maintenance steps I can take to avoid encountering the U02A2 trouble code in my Jeep?

- Regularly inspecting and maintaining the vehicle's wiring harnesses, connectors, and emission control components can help prevent issues that may trigger the U02A2 trouble code.

10. How long does it typically take to repair the U02A2 trouble code in a Jeep?

- The repair time can vary based on the specific cause of the communication problem. Simple fixes like reconnecting loose wires may take less than an hour, while replacing a faulty module could require several hours of labor.