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U128C Honda Code - Lost Communication With The Wiper Control Unit

Quick Answer

The U128C diagnostic trouble code (DTC) indicates a communication failure between the vehicle's control modules and the wiper control unit. Common causes include Damaged or corroded wiring harnesses and connectors related to the wiper control unit, Faulty wiper control unit that fails to send or receive signals, Issues with the Engine Control Module (ECM) affecting communication protocols. 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
U128C Honda indicates Lost Communication With The Wiper Control Unit.
Common causes
Common causes include Damaged or corroded wiring harnesses and connectors related to the wiper control unit, Faulty wiper control unit that fails to send or receive signals, Issues with the Engine Control Module (ECM) affecting communication protocols.
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 Nov 06, 2024
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Code U128C Honda Description

The U128C diagnostic trouble code (DTC) indicates a communication failure between the vehicle's control modules and the wiper control unit. This code is specific to Honda vehicles and suggests that the Engine Control Module (ECM) is unable to establish a proper communication link with the wiper control unit, which is responsible for controlling the operation of the windshield wipers.

OBDII Code U128C Honda - Lost Communication With The Wiper Control Unit
U128C Honda Code - Lost Communication With The Wiper Control Unit

Common Causes of U128C Honda

  1. Damaged or corroded wiring harnesses and connectors related to the wiper control unit.
  2. Faulty wiper control unit that fails to send or receive signals.
  3. Issues with the Engine Control Module (ECM) affecting communication protocols.
  4. Software glitches or programming errors within the vehicle's control modules.
  5. Electrical interference from other components or systems within the vehicle.

Symptoms of U128C Honda

  1. Windshield wipers do not operate at all.
  2. Wipers function intermittently or erratically.
  3. Wiper speed settings do not respond as expected.
  4. Dashboard warning lights related to the wiper system may illuminate.
  5. Other electrical components may show signs of malfunction, indicating broader communication issues.

How to Fix U128C Honda

  1. Visual Inspection: Begin with a thorough visual inspection of the wiring harness and connectors associated with the wiper control unit. Look for signs of corrosion, damage, or loose connections.
  2. Testing the Wiper Control Unit: Use a multimeter to test the wiper control unit for proper voltage and functionality. If the unit is found to be faulty, it will need to be replaced.
  3. Check ECM Communication: Utilize an OBD-II scanner to check for other codes that may indicate broader communication issues. Ensure that the ECM is functioning correctly and is properly programmed.
  4. Repair or Replace Wiring: If damaged wiring or connectors are found, repair or replace them as necessary to restore proper communication.
  5. Clear Codes and Test: After repairs, clear the DTCs using an OBD-II scanner and perform a test drive to ensure that the wipers operate correctly and that the U128C code does not reappear.

Cost to Fix U128C Honda

The typical repair costs for addressing the U128C code can vary widely based on the specific diagnosis and repairs needed. On average, you might expect to pay between $150 and $500. This estimate includes parts such as a new wiper control unit (if necessary) and labor costs. The labor rates at auto repair shops can range from $80 to $150 per hour, depending on location, vehicle make and model, and engine type. In metropolitan areas or at dealerships, rates may be higher, while independent shops may offer lower rates. It is advisable to check local rates for a more precise estimate tailored to your specific situation.

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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 U128C Honda Code

1. What are the common symptoms of OBDII code U128C in a Honda related to lost communication with the wiper control unit?

- Common symptoms include inoperative wipers, erratic wiper movements, and failure to control wiper speed.

2. What are some possible causes of OBDII code U128C in a Honda indicating lost communication with the wiper control unit?

- Potential causes may include a faulty wiper control unit, damaged wiring or connectors, or an issue with the vehicle's network communication system.

3. How can I diagnose the OBDII code U128C in my Honda that points to lost communication with the wiper control unit?

- Diagnosis typically involves checking the wiper control unit for power and ground, inspecting wiring and connectors for damage, and using a scan tool to communicate with the control unit.

4. Can a DIY enthusiast repair OBDII code U128C in a Honda related to lost communication with the wiper control unit?

- DIY repairs are possible if the issue is with wiring or connectors. However, if the problem lies with the wiper control unit itself, it may require professional diagnosis and replacement.

5. Is it safe to drive my Honda with OBDII code U128C indicating lost communication with the wiper control unit?

- It is not recommended to drive in inclement weather or when wiper functionality is compromised. Address the issue promptly to ensure safe driving conditions.

6. Are there any quick tips for resolving OBDII code U128C in a Honda due to lost communication with the wiper control unit?

- Quick tips include checking fuses related to the wiper system, ensuring all connections are secure, and performing a reset by disconnecting the battery for a few minutes.

7. How much does it typically cost to repair OBDII code U128C in a Honda caused by lost communication with the wiper control unit?

- Repair costs can vary depending on the root cause of the issue. Costs may include diagnosis fees, parts replacement, and labor charges, which can range from a few hundred to over a thousand dollars.

8. Can extreme weather conditions contribute to triggering OBDII code U128C in a Honda related to lost communication with the wiper control unit?

- Yes, extreme weather conditions like heavy rain, snow, or extreme temperatures can potentially exacerbate issues with the wiper control unit, leading to communication errors.

9. How long does it typically take to repair OBDII code U128C in a Honda indicating lost communication with the wiper control unit?

- The repair duration can vary based on the complexity of the issue. Simple fixes like reconnecting loose wiring may take a short time, while replacing the wiper control unit could require several hours.

10. Can resetting the ECU (Engine Control Unit) help clear OBDII code U128C in a Honda related to lost communication with the wiper control unit?

- Resetting the ECU may temporarily clear the code, but it is crucial to address the underlying issue causing the communication error with the wiper control unit to prevent the code from reappearing.

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