On most Honda VCM-equipped six-cylinder engines, the system disables three cylinders—cylinders 1, 3, and 5—so the engine runs on three cylinders (2, 4, and 6) to save fuel.
The aim of Honda's Variable Cylinder Management is to reduce pumping losses and improve highway fuel economy by deactivating cylinders during light-load cruising while preserving smooth power delivery when acceleration is required. In practice, the system typically switches off one cylinder from each bank, resulting in a three-cylinder mode that reactivates as soon as more torque is needed. The exact pattern can vary by model year and engine family, but the common configuration is to deactivate the odd-numbered cylinders on a 6-cylinder V6 engine.
VCM cylinder deactivation pattern
The following cylinders are typically deactivated when VCM engages, creating a three-cylinder running mode:
- 1
- 3
- 5
With these cylinders shut off, the engine operates on cylinders 2, 4, and 6, providing power when needed and returning to three-cylinder operation for improved efficiency during light-throttle driving.
Model and generation notes
Honda's VCM has appeared across several models and generations, including variations on the 3.5L J-series V6 and certain Earth Dreams V6s. Some newer engines have refined the transition between modes for smoother feel, and there are differences by market and model year. For precise behavior in your vehicle, check the owner’s manual or the service bulletin for your engine and model year.
Summary
Honda's VCM generally disables three cylinders—cylinders 1, 3, and 5—on six-cylinder engines, leaving cylinders 2, 4, and 6 active to create a temporary three-cylinder mode for better fuel efficiency. Pattern and behavior can vary by generation and model, so verify for your specific vehicle.