AutoCodes – Generic – U05A5

U05A5 Code - Implausible Data Received From Ammonia Sensor

Quick Answer

The Powertrain Control Module (PCM) monitors the Ammonia Sensor. Common causes include Faulty Ammonia Sensor Module, Ammonia Sensor Module harness is open or shorted, Ammonia Sensor 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: U05A5 indicates Implausible Data Received From Ammonia Sensor.
Common causes: Common causes include Faulty Ammonia Sensor Module, Ammonia Sensor Module harness is open or shorted, Ammonia Sensor 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 1,070

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 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U05A5 Description

The Powertrain Control Module (PCM) monitors the Ammonia Sensor. The Diagnostic Trouble Code (DTC) sets when an unexpected data link message was sent to the PCM form the Ammonia Sensor Module and was unable to be interpreted.

OBDII Code U05A5 - Implausible Data Received From Ammonia Sensor - AutoCodes.com — U05A5 Code - Implausible Data Received From Ammonia Sensor

What does this mean?

What are the Possible Causes of the DTC U05A5?

Faulty Ammonia Sensor Module
Ammonia Sensor Module harness is open or shorted
Ammonia Sensor Module circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC U05A5?

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 U05A5 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 U05A5 code?

Need more information on how to fix the U05A5 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U05A5 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U05A5 Chrysler — Implausible Data Received From Ammonia Sensor
U05A5 Dodge — Implausible Data Received From Ammonia Sensor
U05A5 Jeep — Implausible Data Received From Ammonia Sensor
U05A5 RAM — Implausible Data Received From Ammonia Sensor

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 U05A5 Code

1. What are the common symptoms of OBDII code U05A5?

- Common symptoms include the check engine light being illuminated, decreased fuel efficiency, and potential issues with the vehicle's emissions system.

2. What does the OBDII code U05A5 mean?

- The code U05A5 indicates that the engine control module has detected implausible data being received from the ammonia sensor.

3. What are the possible causes of OBDII code U05A5?

- Possible causes include a faulty ammonia sensor, wiring issues in the sensor circuit, software glitches in the engine control module, or problems with the SCR (selective catalytic reduction) system.

4. How serious is OBDII code U05A5?

- While the code itself may not cause immediate drivability issues, it should be addressed promptly to prevent potential damage to the vehicle's emissions system and ensure optimal performance.

5. How can I diagnose OBDII code U05A5?

- Diagnosing this code typically involves using a diagnostic scanner to retrieve the code, checking the sensor's wiring and connections, and testing the sensor itself for proper function.

6. Can I continue driving with OBDII code U05A5?

- It is generally advisable to avoid prolonged driving with this code present, as it may lead to increased emissions and potential damage to the vehicle's catalytic converter over time.

7. How can I repair OBDII code U05A5?

- Repair options may include replacing the faulty ammonia sensor, repairing any damaged wiring or connections, updating the engine control module software, or addressing any issues with the SCR system.

8. Can a DIYer fix OBDII code U05A5?

- While some DIYers may be able to address this code by replacing the sensor or checking the wiring, it is recommended to consult a professional mechanic for a proper diagnosis and repair.

9. How much does it cost to fix OBDII code U05A5?

- The cost of fixing this code can vary depending on the specific cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

10. How can I prevent OBDII code U05A5 from recurring?

- To prevent this code from recurring, it is important to address any underlying issues promptly, perform regular maintenance on the vehicle's emissions system, and follow the manufacturer's recommended service schedule.