AutoCodes – Lincoln – U02A2 Lincoln

U02A2 Lincoln 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 Lincoln 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 556

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

What does this mean?

What are the Possible Causes of the DTC U02A2 Lincoln?

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 Lincoln?

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 Lincoln 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 Lincoln Code

1. What are the common symptoms of the U02A2 OBDII code "Lost Communication With Reductant Quality Module" in a Lincoln?

- Common symptoms include the check engine light turning on, reduced engine performance, and potential failure to pass emissions testing.

2. What can cause the U02A2 code to appear in a Lincoln?

- The U02A2 code usually indicates a communication issue between the vehicle's onboard computer and the Reductant Quality Module, which could be caused by a faulty module, wiring issues, or a software glitch.

3. How can I diagnose the U02A2 code in my Lincoln?

- Diagnosing the U02A2 code typically involves using a diagnostic scanner to retrieve the specific fault code, checking the wiring connections to the Reductant Quality Module, and testing the module itself for functionality.

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

- It is generally safe to drive your Lincoln with the U02A2 code, but it is recommended to have the issue diagnosed and repaired as soon as possible to prevent potential damage to the vehicle's emissions system.

5. Is the U02A2 code easy to repair in a Lincoln?

- Repairing the U02A2 code may range from simple tasks like checking and reseating connectors to more complex procedures like replacing the Reductant Quality Module. The difficulty of the repair depends on the underlying cause of the communication failure.

6. Are there any common repair tips for fixing the U02A2 code in a Lincoln?

- Common repair tips include checking for loose or damaged wiring, ensuring proper connections to the Reductant Quality Module, and verifying that the module itself is functioning correctly before replacing any components.

7. How much does it cost to repair the U02A2 code in a Lincoln?

- The cost of repairing the U02A2 code in a Lincoln can vary depending on the cause of the issue, the need for replacement parts, and labor costs. It is advisable to consult a professional mechanic for an accurate estimate.

8. Can the U02A2 code be reset without repairs in a Lincoln?

- While you can clear the U02A2 code with a diagnostic scanner, it is not recommended to reset the code without addressing the underlying issue, as it may reappear and potentially cause further problems with the vehicle's emissions system.

9. Will the U02A2 code cause my Lincoln to fail emissions testing?

- Yes, the U02A2 code can cause your Lincoln to fail emissions testing, as it indicates a problem with the vehicle's emissions control system. It is essential to address the issue promptly to pass emissions testing.

10. How can I prevent the U02A2 code from reoccurring in my Lincoln?

- To prevent the U02A2 code from reoccurring, regular maintenance and inspections of the Reductant Quality Module, wiring connections, and emissions system are recommended. Addressing any related issues promptly can help avoid future occurrences of the code.