Honda Pilot 2009-2026 VCM Disabler Harness

For the 2015–2026 Honda Pilot: an inline ECT1 harness that stops Variable Cylinder Management from engaging. No OBD-II plug, no software change. It sits between the coolant temperature sensor and the factory connector, with four resistance settings to match the vehicle.

It is fully reversible and leaves the engine computer untouched.

Fitment

Listed applications (100% fitment match):

• Honda Pilot: 2015–2026

Pilot generations and their VCM: 2009–2015 J35Z4 with VCM-2 (3, 4 or 6 cylinders), 2016–2022 J35Y6 with VCM-3 (3 or 6 cylinders), and 2023-on J35Y8 with a newer 3/6-cylinder VCM.

Engine generations above come from Honda and published engine references; check your VIN against them before ordering.

How Honda VCM works

VCM uses the VTEC rocker-arm system to keep the intake and exhaust valves closed on one bank of cylinders and cuts fuel to them at the same time. Honda chose the rear bank, which is why owners describe the engine as running on three cylinders while cruising. Honda says the system looks at throttle position, vehicle speed, engine speed, gear selection and engine oil temperature before it switches, and brings all six cylinders back as soon as more torque is needed.

How the harness works

The engine computer will not switch to VCM until coolant temperature is in range. The ECT1 sensor reports that temperature as a resistance that drops as the engine heats up. This harness adds resistance in series, so the computer sees a slightly lower temperature than the actual one and keeps the engine in six-cylinder mode. The 68Ω, 82Ω, 100Ω and 120Ω settings are resistance values, not power levels; the supplied guide tells you which one to start with.

Fitting it

With the engine cold and the ignition off, unplug the factory connector from the ECT1 sensor, plug the harness into the sensor, and plug the factory connector into the harness. Set the resistance selector to the value the instructions list, secure the harness away from the exhaust, belts and fan, and start the engine. The connection is inline, not at the OBD-II port. To remove it, reconnect the factory plug directly to the sensor.

After installation

The change is most noticeable at steady cruising speed on a warm engine, where VCM previously cut in. With the harness installed, that mode change should no longer happen. Acceleration and full-throttle behavior are the same as before. If a check-engine light appears, recheck the connections and the resistance setting against the instructions, then contact support with the code.

Why owners turn VCM off

Owners usually want three things: no shudder at steady cruise, smoother behavior at the moderate, steady speeds where VCM switches most, and fewer worries about oil getting past the rings on the idle bank. The harness gives consistent six-cylinder operation. It does not add power and it is not a repair for an engine that already burns oil or misfires.

Three versions of VCM

There are three main VCM versions: VCM-1 (3 or 6 cylinders), VCM-2 (3, 4 or 6 cylinders) and VCM-3 (3 or 6 cylinders, on the later direct-injection J35Y engines). The version depends on model year, and the notes above show which applies to each covered generation. Since all of them rely on the engine computer's temperature checks, the ECT1 approach applies across the range.

Before you install

Scan for codes and fix any existing misfire, oil-consumption or sensor problem first. A harness that changes the ECT1 reading will not cure a failing sensor or a cooling-system fault, and an engine that already fouls plugs on one bank needs inspection. Watch coolant level and the temperature gauge as you would normally.

Check before you order

• Your model and year match a row above (2015–2026 Honda Pilot).
• Your vehicle has the V6 with VCM described in the notes above (not a four-cylinder, hybrid or turbo model).
• The connector at your ECT1 sensor matches the product photos.
• Engine swaps, aftermarket ECUs or modified wiring need a fitment check from support first.
• Unsure? Send your VIN to support@automotivebypass.com.

Shipping and support

Shipping is free to the contiguous US. Orders leave in 1–2 business days and usually arrive 3–4 business days later. Returns are accepted within 45 days with pre-approval; a 20% restocking fee applies and the buyer covers return shipping. The part carries a 3-year limited warranty, and support@automotivebypass.com answers Monday to Friday, 9–5 Pacific.