U1204 Honda Code - IMA-CAN Malfunction
Quick Answer
The Integrated Motor Assist (IMA) - Controller Area Network (CAN) uses two signal lines, IMACANH and IMACANL, and it receives and transmits multiple signals simultaneously to/from multiple control modules. Common causes include Faulty Powertrain Control Module (PCM), Powertrain Control Module harness is open or shorted, Powertrain 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
- U1204 Honda indicates IMA-CAN Malfunction.
- Common causes
- Common causes include Faulty Powertrain Control Module (PCM), Powertrain Control Module harness is open or shorted, Powertrain 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.
Code U1204 Honda Description
When the information is not sent from the Powertrain Control Module (PCM) through the IMA-CAN and this condition continues for a specified time or when the information sent from the PCM is abnormal and this condition continues for a specified cycle, the Battery Condition Monitor (BCM) module detects a malfunction and when BUS-OFF is not detected after the time to detect BUS-OFF has passed, a DTC is stored.
What are the Possible Causes of the DTC U1204 Honda?
- Faulty Powertrain Control Module (PCM)
- Powertrain Control Module harness is open or shorted
- Powertrain Control Module circuit poor electrical connection
- Faulty Battery Condition Monitor (BCM) Module)
- Faulty Motor Control Module (MCM)
How to Fix the DTC U1204 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.
Code Tech Notes
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)
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the U1204 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.
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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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