U1291 Honda Code - MICU Lost Communication With Relay Control Module
Quick Answer
The Diagnostic Trouble Code (DTC) sets when a communication malfunction was detected between the Relay Control Module and the Rear Multiplex Integrated Control Unit (MICU). Common causes include Faulty Relay Control Module, Relay Control Module harness is open or shorted, Relay 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
- U1291 Honda indicates MICU Lost Communication With Relay Control Module.
- Common causes
- Common causes include Faulty Relay Control Module, Relay Control Module harness is open or shorted, Relay 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 U1291 Honda Description
What are the Possible Causes of the DTC U1291 Honda?
- Faulty Relay Control Module
- Relay Control Module harness is open or shorted
- Relay Control Module circuit poor electrical connection
- Faulty Rear Multiplex Integrated Control Unit (MICU)
How to Fix the DTC U1291 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 U1291 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 U1291 Honda Code
What does the OBDII code U1291 mean in a Honda vehicle?
The OBDII code U1291 indicates that the Multi-Information Control Unit (MICU) has lost communication with the Relay Control Module, which can affect various electrical functions in the vehicle.
What are some common symptoms associated with the U1291 code?
Symptoms may include malfunctioning electrical components, non-working lights, failure of the power windows, or issues with the vehicle's ignition system.
What could cause the U1291 code to trigger?
Common causes include faulty wiring or connectors, a defective Relay Control Module, issues with the MICU, or problems related to the vehicle’s battery or power supply.
How can I diagnose the U1291 code?
Start by checking the vehicle's battery and fuses, then inspect the wiring and connectors related to the MICU and Relay Control Module for damage or corrosion. Use a scan tool to check for additional codes.
Is it safe to drive a vehicle with the U1291 code?
It may not be safe to drive, as the loss of communication can lead to malfunctioning electrical systems that could impair vehicle operation. It's best to diagnose and repair the issue promptly.
What are some common repair solutions for the U1291 code?
Repairs may involve replacing or repairing damaged wiring, connectors, or the Relay Control Module itself. Resetting the MICU or reprogramming it may also be necessary.
Can I clear the U1291 code without fixing the underlying issue?
While you can clear the code using an OBDII scanner, it is not advisable to do so without addressing the root cause, as the code will likely reappear and the symptoms may persist.
How much does it typically cost to fix the U1291 code?
Repair costs can vary widely based on the underlying issue, ranging from a few dollars for a simple wiring fix to several hundred dollars for replacing the Relay Control Module or MICU.
Are there any preventative measures to avoid the U1291 code?
Regular vehicle maintenance, including electrical system checks, can help prevent issues. Ensuring that connections are clean and secure can also reduce the risk of communication loss between modules.
Discuss the causes and fixes for U1291 Honda OBDII Code
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