AutoCodes – Honda – U12AA Honda

U12AA Honda Code - Lost Communication With Shifter

Quick Answer

The Controller Area Network (CAN) transmits/receives pulsing signals to/from the control modules simultaneously by using F-CAN A and B signal lines. Common causes include Faulty SBW Shifter Control Module, SBW Shifter Control Module harness is open or shorted, SBW Shifter 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: U12AA Honda indicates Lost Communication With Shifter.
Common causes: Common causes include Faulty SBW Shifter Control Module, SBW Shifter Control Module harness is open or shorted, SBW Shifter 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 4,801

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 15, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U12AA Honda Description

The Controller Area Network (CAN) transmits/receives pulsing signals to/from the control modules simultaneously by using F-CAN A and B signal lines. If the Transmission Control Module (TCM) cannot receive the signal sent from the SBW Shifter Control Module for a specified time, or if the received signal is abnormal for a specified duration, the TCM detects a malfunction and stores a Diagnostic Trouble Code (DTC).

OBDII Code U12AA Honda - Lost Communication With Shifter - AutoCodes.com — U12AA Honda Code - Lost Communication With Shifter

What does this mean?

What are the Possible Causes of the DTC U12AA Honda?

Faulty SBW Shifter Control Module
SBW Shifter Control Module harness is open or shorted
SBW Shifter Control Module circuit poor electrical connection
Faulty Transmission Control Module (TCM)

How to Fix the DTC U12AA Honda?

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 U12AA Honda 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 U12AA Honda code?

Need more information on how to fix the U12AA Honda code? Get Access to Factory Service Manuals

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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 Honda Code

1. What does the OBDII code U12AA for Honda mean?

The U12AA code indicates a problem with communication between the vehicle's control modules and the shifter assembly.

2. What are some common symptoms of the U12AA code in a Honda?

Common symptoms include issues with shifting gears, difficulty starting the vehicle, and warning lights on the dashboard.

3. What are some possible causes of the U12AA code in a Honda?

Possible causes include a faulty shifter assembly, damaged wiring or connectors, a malfunctioning control module, or a communication error between components.

4. How can I diagnose the U12AA code in my Honda?

Diagnosis typically involves using a scan tool to retrieve the trouble codes, inspecting the shifter assembly and related components for damage, and testing the communication between modules.

5. Can I drive my Honda with the U12AA code?

It is not recommended to drive your vehicle with the U12AA code present, as it can lead to safety issues and further damage if left unresolved.

6. How can I repair the U12AA code in my Honda?

Repair options may include fixing or replacing the shifter assembly, repairing any damaged wiring or connectors, resetting the control modules, or reprogramming the system.

7. Is the U12AA code a common issue in Honda vehicles?

The U12AA code can occur in Honda vehicles, especially in models with electronic shifters and advanced control systems.

8. Can I reset the U12AA code in my Honda without repairs?

While you can try clearing the code with a scan tool, it is important to address the underlying issue causing the code to prevent it from reoccurring.

9. Will the U12AA code cause my Honda to fail an emissions test?

The U12AA code itself may not cause your Honda to fail an emissions test, but it can indicate a problem that may affect the vehicle's overall performance and emissions.

10. How much does it typically cost to repair the U12AA code in a Honda?

The cost of repairing the U12AA code can vary depending on the exact cause of the issue, the extent of the repairs needed, and whether you choose to do the repairs yourself or take your vehicle to a mechanic.