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Engine-Codes – Honda – U1204 Honda

U1204 Honda Code - IMA-CAN Malfunction

Quick Answer

The U1204 Honda code refers to an IMA-CAN malfunction in the vehicle's Integrated Motor Assist (IMA) system, which is a hybrid powertrain technology used in Honda vehicles. Common causes include Faulty IMA control module, Wiring or connection issues in the CAN network, Communication errors between IMA system and other modules. 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
U1204 Honda indicates IMA-CAN Malfunction.
Common causes
Common causes include Faulty IMA control module, Wiring or connection issues in the CAN network, Communication errors between IMA system and other modules.
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 05, 2024
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Code U1204 Honda Description

The U1204 Honda code refers to an IMA-CAN malfunction in the vehicle's Integrated Motor Assist (IMA) system, which is a hybrid powertrain technology used in Honda vehicles. The Controller Area Network (CAN) is a communication network that allows various modules in the vehicle to communicate with each other. When this code is triggered, it indicates a problem with the communication between the IMA system and other modules in the vehicle. This can potentially affect the performance of the hybrid system, leading to issues with power delivery, fuel efficiency, and overall drivability.

OBDII Code U1204 Honda - IMA-CAN Malfunction
U1204 Honda Code - IMA-CAN Malfunction

Common Causes of U1204 Honda

  1. Faulty IMA control module
  2. Wiring or connection issues in the CAN network
  3. Communication errors between IMA system and other modules
  4. Software glitches or malfunctions in the hybrid system
  5. Electrical issues such as a weak battery or alternator

Symptoms of U1204 Honda

  1. Reduced fuel efficiency
  2. Loss of power or acceleration
  3. Illuminated check engine light
  4. Inconsistent hybrid system operation
  5. Erratic battery charging behavior

How to Fix U1204 Honda

  1. Diagnose the specific cause of the IMA-CAN malfunction using a diagnostic scanner to pinpoint the source of the communication error.
  2. Check for any loose or damaged wiring connections in the CAN network and repair as necessary.
  3. Inspect the IMA control module for any signs of damage or malfunction, and replace if needed.
  4. Update the software in the hybrid system to the latest version to address any software glitches.
  5. Perform a thorough system check and test drive to ensure the issue has been resolved and the IMA system is functioning properly.

Cost to Fix U1204 Honda

The cost of repairing an IMA-CAN malfunction in a Honda vehicle can vary depending on the specific cause of the issue and the labor rates in your area. Typically, this repair may range from $200 to $600, including parts and labor. However, it's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's advisable to get quotes from different shops to compare prices. Additionally, if the repair involves replacing expensive components like the IMA control module, the cost may be higher.

What does this mean?

Tech Notes for U1204 Honda

DTC U1204 (55): IMA-CAN Malfunction (Powertrain Control Module (PCM)- Battery Condition Monitor (BCM) Module)
DTC U1204 (95): IMA-CAN Malfunction (Powertrain Control Module (PCM)- Motor Control Module (MCM))
DTC U1204 (55): IMA-CAN Malfunction (PCM-BCM Module)
DTC U1204 (95): IMA-CAN Malfunction (PCM-MCM)

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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 U1204 Honda Code

1. What are the common symptoms of OBDII code U1204 Honda (IMA-CAN Malfunction)?

- Common symptoms include the check engine light illuminating, decreased fuel efficiency, and potential issues with the hybrid system's performance.

2. What are some possible causes of the U1204 Honda code?

- Potential causes include faulty IMA (Integrated Motor Assist) control module, wiring issues, communication errors within the Controller Area Network (CAN) bus, or a malfunctioning IMA battery.

3. How can I diagnose the U1204 Honda code?

- Diagnosis typically involves using an OBDII scanner to retrieve the specific trouble code, checking for any related codes, inspecting the hybrid system components, and testing the communication between control modules.

4. Can I drive my Honda with the U1204 code?

- It is generally not recommended to drive with the U1204 code present, as it can indicate potential issues with the hybrid system that may affect the vehicle's performance and safety.

5. How is the U1204 Honda code usually repaired?

- Repairing the U1204 code often involves addressing the underlying cause, such as replacing a faulty IMA control module, repairing wiring issues, or resolving communication errors within the CAN bus.

6. Are there any DIY tips for fixing the U1204 Honda code?

- DIY repairs for the U1204 code may be challenging due to the complexity of the hybrid system. It is recommended to consult a professional mechanic with experience in hybrid vehicle diagnostics and repairs.

7. How much does it typically cost to repair the U1204 Honda code?

- Repair costs for the U1204 code can vary depending on the specific cause of the issue, but they may range from a few hundred to over a thousand dollars, including parts and labor.

8. Can the U1204 Honda code be intermittent?

- Yes, the U1204 code can sometimes be intermittent, meaning that the issue may come and go. However, it is essential to address the underlying cause to prevent further problems.

9. Will resetting the check engine light resolve the U1204 Honda code?

- Simply resetting the check engine light may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear. It is important to diagnose and repair the problem.

10. Is the U1204 Honda code specific to certain Honda models?

- The U1204 code is commonly associated with Honda hybrid vehicles, particularly those equipped with the Integrated Motor Assist (IMA) system.

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