AutoCodes – Honda – U129E Honda

U129E Honda 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 Honda 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 7,967

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 Honda 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 Honda - Lost Communication With PCU - AutoCodes.com — U129E Honda Code - Lost Communication With PCU

What does this mean?

What are the Possible Causes of the DTC U129E Honda?

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 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 U129E 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 U129E Honda code?

Need more information on how to fix the U129E Honda code? Get Access to Factory Service Manuals

Need Help with the 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 Honda Code

1. What are common symptoms of OBDII code U129E in a Honda indicating lost communication with the PCU?

- Common symptoms include intermittent or permanent loss of power steering assistance, illuminated warning lights on the dashboard, and difficulty starting the vehicle.

2. What are some possible causes of OBDII code U129E in a Honda?

- Causes may include a faulty power steering control module, damaged wiring or connectors in the communication network, or issues with the PCU itself.

3. How can I diagnose the OBDII code U129E in my Honda?

- Diagnosing the issue may involve using an OBDII scanner to retrieve the code and checking the power steering control module, wiring, and connectors for any visible damage or loose connections.

4. Is it safe to continue driving my Honda with the U129E trouble code?

- It is not recommended to drive the vehicle with the U129E code present, as it may lead to sudden loss of power steering assistance, increasing the risk of accidents.

5. Can I reset the U129E trouble code in my Honda to see if it comes back?

- While you can clear the trouble code temporarily, it is important to diagnose and repair the underlying issue causing the code to prevent it from reoccurring.

6. How much does it typically cost to repair OBDII code U129E in a Honda?

- Repair costs can vary depending on the exact cause of the issue, but it may involve replacing the power steering control module, repairing damaged wiring, or addressing PCU-related problems.

7. Are there any DIY repair tips for fixing the U129E trouble code in a Honda?

- DIY repair tips may include checking and tightening wiring connections, inspecting fuses related to the power steering system, and ensuring proper grounding of the power steering control module.

8. Can a software update fix the U129E code in my Honda?

- In some cases, a software update from the manufacturer may address communication issues causing the U129E trouble code, so it is worth checking with a Honda dealership for any available updates.

9. How long does it usually take to repair the U129E trouble code in a Honda?

- The repair time can vary depending on the complexity of the issue and the availability of parts, but it may take a few hours to a full day to diagnose and fix the problem.

10. Is the U129E trouble code common in certain Honda models or years?

- The U129E code related to lost communication with the PCU can occur in various Honda models, but it may be more prevalent in specific years or models known for power steering system issues.