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U12AA Acura Code - Lost Communication With Shifter

Quick Answer

The U12AA code for an Acura indicates that there has been a communication error between the vehicle's control module and the shifter system. Common causes include Faulty transmission control module, Malfunctioning shifter assembly, Loose or corroded wiring connections. 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
U12AA Acura indicates Lost Communication With Shifter.
Common causes
Common causes include Faulty transmission control module, Malfunctioning shifter assembly, Loose or corroded wiring connections.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code U12AA Acura Description

The U12AA code for an Acura indicates that there has been a communication error between the vehicle's control module and the shifter system. This code typically points to a problem with the transmission control module or the shifter assembly, which can result in issues with shifting gears. When this communication is lost, it can lead to difficulties in changing gears, erratic shifting patterns, or even the inability to shift at all. This can pose a safety risk as it may affect the vehicle's ability to accelerate or decelerate properly.

OBDII Code U12AA Acura - Lost Communication With Shifter
U12AA Acura Code - Lost Communication With Shifter

Common Causes of U12AA Acura

  1. Faulty transmission control module
  2. Malfunctioning shifter assembly
  3. Loose or corroded wiring connections
  4. Software glitches in the control module
  5. Physical damage to the shifter mechanism

Symptoms of U12AA Acura

  1. Difficulty shifting gears
  2. Delayed shifting response
  3. Inability to shift gears
  4. Erratic shifting patterns
  5. Transmission slipping

How to Fix U12AA Acura

  1. Begin by conducting a diagnostic scan to confirm the U12AA code and pinpoint the exact cause of the communication loss.
  2. Inspect the wiring connections between the transmission control module and the shifter for any signs of damage or corrosion. Repair or replace any faulty connections.
  3. Test the transmission control module and the shifter assembly for proper functionality. Replace any components that are found to be malfunctioning.
  4. Clear the diagnostic trouble codes and reset the system to ensure that the communication between the control module and shifter is restored.
  5. Test drive the vehicle to verify that the shifting issues have been resolved and that the U12AA code does not reappear.

Cost to Fix U12AA Acura

The typical repair costs for addressing a U12AA code can vary depending on the exact cause of the communication loss and the specific components that need to be replaced. On average, the repair for this issue can range from $200 to $800, including parts and labor. It is important to note that the diagnosis time and labor rates at auto repair shops can fluctuate based on various factors, so it is recommended to inquire about local rates for a more accurate estimate.

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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 U12AA Acura Code

1. What are the common symptoms of the OBDII code U12AA in an Acura related to lost communication with the shifter?

- Common symptoms include the inability to shift gears, the gear indicator not displaying correctly, and warning lights on the dashboard related to the transmission.

2. What are the possible causes of the U12AA code indicating lost communication with the shifter in an Acura?

- Potential causes include a faulty shifter position switch, damaged wiring or connectors in the shifter circuit, or a communication error between the shifter module and the vehicle's computer.

3. How can I diagnose the U12AA code in my Acura if I suspect a communication issue with the shifter?

- To diagnose the issue, you can use a diagnostic scanner to read the code, check the wiring and connectors for damage, and test the shifter position switch for proper functionality.

4. Are there any DIY repair tips for resolving the U12AA code related to lost communication with the shifter in an Acura?

- DIY repair tips may include checking and repairing any damaged wiring or connectors, resetting the vehicle's computer by disconnecting the battery, or replacing the faulty shifter position switch.

5. Can the U12AA code in an Acura indicating lost communication with the shifter be fixed without professional help?

- Some simple fixes, such as checking and repairing wiring connections, may be possible for DIY enthusiasts. However, complex issues may require professional diagnosis and repair.

6. Is it safe to continue driving my Acura with the U12AA code showing lost communication with the shifter?

- It is not recommended to drive your Acura with the U12AA code, as it can lead to potential transmission issues and safety concerns due to the loss of communication with the shifter.

7. How much does it typically cost to repair the U12AA code related to lost communication with the shifter in an Acura?

- Repair costs can vary based on the specific issue causing the code, but expenses may include parts replacement, labor costs, and diagnostic fees, ranging from a few hundred to over a thousand dollars.

8. Can a software update or reprogramming fix the U12AA code indicating lost communication with the shifter in my Acura?

- In some cases, a software update or reprogramming of the vehicle's computer may resolve communication issues and clear the U12AA code related to the shifter.

9. Are there any recalls or technical service bulletins related to the U12AA code affecting Acura vehicles?

- It is recommended to check with your local Acura dealership or visit the manufacturer's website to see if there are any recalls or technical service bulletins related to the U12AA code and communication issues with the shifter.

10. How can I prevent the U12AA code indicating lost communication with the shifter from occurring in my Acura in the future?

- Regular maintenance, timely repairs of any wiring or connector issues, and prompt attention to warning lights or error codes can help prevent the recurrence of the U12AA code and maintain the proper functioning of the shifter system in your Acura.

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