AutoCodes – Acura – U1291 Acura

U1291 Acura Code - MICU Lost Communication With Relay Control Module

Quick Answer

The Diagnostic Trouble Code (DTC) sets when a communication malfunction was detected between the Relay Control Module and the Rear Multiplex Integrated Control Unit (MICU). Common causes include Faulty Relay Control Module, Relay Control Module harness is open or shorted, Relay Control 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: U1291 Acura indicates MICU Lost Communication With Relay Control Module.
Common causes: Common causes include Faulty Relay Control Module, Relay Control Module harness is open or shorted, Relay Control 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 1,230

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 May 16, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1291 Acura Description

The Diagnostic Trouble Code (DTC) sets when a communication malfunction was detected between the Relay Control Module and the Rear Multiplex Integrated Control Unit (MICU).

OBDII Code U1291 Acura - MICU Lost Communication With Relay Control Module - AutoCodes.com — U1291 Acura Code - MICU Lost Communication With Relay Control Module

What does this mean?

What are the Possible Causes of the DTC U1291 Acura?

Faulty Relay Control Module
Relay Control Module harness is open or shorted
Relay Control Module circuit poor electrical connection
Faulty Rear Multiplex Integrated Control Unit (MICU)

How to Fix the DTC U1291 Acura?

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 U1291 Acura 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 U1291 Acura code?

Need more information on how to fix the U1291 Acura code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1291 Acura 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 U1291 Acura Code

1. What are the common symptoms of the U1291 OBDII code in an Acura related to MICU lost communication with relay control module?

- Common symptoms include loss of functionality of various electrical components, such as power windows, door locks, or lights.

2. What are the possible causes of the U1291 code in an Acura?

- The U1291 code can be caused by issues with the main MICU unit, faulty wiring or connections, or a malfunctioning relay control module.

3. How can I diagnose the U1291 code in my Acura?

- Diagnosis typically involves using a professional OBDII scanner to retrieve the trouble codes and performing a thorough inspection of the MICU unit, wiring, and relay control module.

4. Can I repair the U1291 code issue in my Acura myself?

- While troubleshooting and diagnosing the issue can be done by enthusiasts, repairing the problem may require advanced knowledge and specialized tools. It is recommended to seek professional help.

5. Is it safe to continue driving with the U1291 code present in my Acura?

- It is not recommended to drive with unresolved electrical issues as they can lead to further damage or safety hazards. It is best to address the problem promptly.

6. How much does it typically cost to repair the U1291 code in an Acura?

- The cost of repair can vary depending on the exact cause of the issue and the labor rates in your area. It is advisable to obtain quotes from reputable auto repair shops.

7. Can a faulty battery or alternator cause the U1291 code in an Acura?

- While a weak battery or alternator can sometimes cause communication errors in the electrical system, they are not common culprits for the U1291 code specifically.

8. Will resetting the trouble codes make the U1291 code disappear permanently?

- Resetting the trouble codes may temporarily clear the U1291 code, but if the underlying issue is not addressed, the code is likely to reappear once the problem resurfaces.

9. Are there any recalls or technical service bulletins related to the U1291 code in Acura vehicles?

- It's advisable to check with your local Acura dealership or online resources for any recalls or technical service bulletins related to the U1291 code in your specific Acura model.

10. How long does it usually take to repair the U1291 code issue in an Acura?

- The repair time can vary based on the complexity of the problem and the availability of parts. It's best to consult with a professional mechanic for an accurate estimate.