P3400 Honda Pilot: Understanding and Troubleshooting the VCM System

If you have a 2011 Honda Pilot with a check engine light on and it has gone into safe mode, you might have received the error code p3400, indicating an issue with the cylinder deactivation system bank one, which, in this car, is the rear bank facing the firewall.

This issue can be caused by a few factors, such as a faulty oil pressure sensor, low oil level, or dirty oil. In this case, the oil was recently changed, so the likely culprit was the oil pressure sensor.

The first step is to remove the top engine cover and disconnect the electrical connector of the oil pressure sensor. Then, using a 24mm socket, unscrew the old sensor and replace it with a new one, making sure to also replace the O-ring.

It’s essential to ensure the new O-ring is properly seated and to torque the sensor to 18 foot-pounds. After reconnecting the electrical connector and putting the engine cover back on, it’s important to reset the error code and start the vehicle to check if the issue has been resolved.

After a few drive cycles, the permanent code should clear, and if there are no more check engine lights, and the vehicle is running smoothly, the problem is likely fixed.

It’s recommended to check for any oil leaks and ensure the O-ring is sealed properly. After confirming everything is in order, the vehicle should be good to go.

It’s always a good practice to double-check with the vehicle manual for specific instructions and torque values. Additionally, if you prefer OEM parts, you can source those for the replacement.

What was the issue with the 2011 Honda Pilot?

The check engine light came on and the car went into limp mode due to the code P3400, related to the cylinder deactivation system bank one issue.

What are the common causes of the P3400 code?

The P3400 code can be caused by a faulty oil pressure sensor, low oil level, or dirty old oil.

What part was replaced to solve the issue?

The oil pressure sensor was replaced.

What were the steps to replace the oil pressure sensor?

1. Remove the top engine cover. 2. Disconnect the electrical connector of the oil pressure sensor. 3. Unscrew the old sensor using a 24mm socket. 4. Replace the O-ring. 5. Install the new sensor and torque it to 18 foot pounds. 6. Reconnect the electrical connector. 7. Reset the code and test the vehicle.

What was the outcome after replacing the oil pressure sensor?

After replacing the oil pressure sensor, the car ran smoothly, regained its power, and the check engine light did not reappear after a short drive.

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