AutoCodes – Acura – U129E Acura

U129E Acura Code - Lost Communication With PCU

Quick Answer

The Controller Area Network (CAN) transmits/receives pulsing signals to/from the control modules simultaneously by using two signal lines (F-CAN_H and F-CAN_L). Common causes include Faulty Keyless Access/TPMS Control Unit, Keyless Access/TPMS Control Unit harness is open or shorted, Keyless Access/TPMS Control Unit 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: U129E Acura indicates Lost Communication With PCU.
Common causes: Common causes include Faulty Keyless Access/TPMS Control Unit, Keyless Access/TPMS Control Unit harness is open or shorted, Keyless Access/TPMS Control Unit 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 2,485

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 12, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U129E Acura Description

The Controller Area Network (CAN) transmits/receives pulsing signals to/from the control modules simultaneously by using two signal lines (F-CAN_H and F-CAN_L). When the Powertrain Control Module (PCM) does not receive the signals from the Keyless Access/TPMS Control Unit via the F-CAN lines for a set time, the PCM detects a malfunction and stores a Diagnostic Trouble Code (DTC).

OBDII Code U129E Acura - Lost Communication With PCU - AutoCodes.com — U129E Acura Code - Lost Communication With PCU

What does this mean?

What are the Possible Causes of the DTC U129E Acura?

Faulty Keyless Access/TPMS Control Unit
Keyless Access/TPMS Control Unit harness is open or shorted
Keyless Access/TPMS Control Unit circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC U129E 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 U129E 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 U129E Acura code?

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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 U129E Acura Code

1. What does the OBDII code U129E for Acura mean?

The U129E code indicates a communication problem between the vehicle's PCM (Powertrain Control Module) and the PCU (Power Control Unit).

2. What are the common symptoms of U129E code in an Acura?

Common symptoms include check engine light illumination, poor engine performance, transmission issues, and possible stalling.

3. What are the possible causes of the U129E code in an Acura?

Causes may include damaged wiring or connectors between the PCM and PCU, a faulty PCU module, software issues, or a malfunctioning PCM.

4. How can I diagnose the U129E code in my Acura?

Diagnosing the U129E code typically involves using a professional OBDII scanner to retrieve the specific code, checking the wiring and connectors for any visible damage, and conducting a thorough inspection of the PCU and PCM.

5. Can I still drive my Acura with the U129E code present?

It is not recommended to drive your Acura with the U129E code present, as it can lead to further damage and potential safety hazards. It is best to address the issue promptly.

6. How can I repair the U129E code in my Acura?

Repair options may include repairing or replacing damaged wiring or connectors, reprogramming the PCM and PCU, or replacing the PCU module if deemed necessary by a professional mechanic.

7. Is it possible to reset the U129E code in my Acura without repairs?

While you can clear the code with an OBDII scanner, it is essential to address the underlying issue causing the U129E code to prevent it from reoccurring.

8. Are there any DIY tips for troubleshooting the U129E code in my Acura?

You can start by checking the wiring and connectors for any visible damage, ensuring all connections are secure, and consulting the vehicle's service manual for specific diagnostic procedures.

9. Can a mechanic help me fix the U129E code in my Acura?

Yes, a qualified mechanic with experience in handling OBDII codes can diagnose the issue accurately and perform the necessary repairs to fix the U129E code.

10. What should I do if the U129E code persists after repairs in my Acura?

If the U129E code persists after repairs, it may indicate an unresolved issue or a deeper underlying problem. In such cases, it is advisable to seek further diagnostic assistance from a professional technician.