Acura MDX 3.5L V6 VCM Disabler Harness – 2014-2020 Non-Hybrid & 2022-2026 Non-Type S

For the 2014–2020, 2022–2026 Acura MDX: 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.

The factory system is not reprogrammed, and the harness comes out by unplugging it.

Fitment

Listed applications (100% fitment match):

• Acura MDX: 2014–2020, 2022–2026

The 2014 redesign brought the MDX a direct-injected 3.5L V6 (J35Y5) with VCM-3 (3- or 6-cylinder operation). This listing covers the non-hybrid 3.5L models only; the Sport Hybrid and the turbocharged Type S use different powertrains.

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

How the factory system decides

At light load, Honda's VCM idles one bank of cylinders. A synchronizing piston inside the rocker assembly disconnects the rocker arms for those cylinders from the cam, so their valves stay shut, and their injectors stop. Depending on generation, the engine runs on 3, 4 or 6 cylinders. The engine computer only allows this when its temperature and load conditions are met.

Inside the harness

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.

Installation

The harness has a sensor-side plug and a vehicle-side plug. Fit it with the engine off and cool, confirm both locks click, select the resistance value from the instructions, and route the lead away from heat and moving parts. Removal is the reverse.

Which VCM your engine has

Honda has used several versions of VCM. The first (2005–2007 Odyssey, early Pilot 2WD) switched between 3 and 6 cylinders. VCM-2, used on many 2008–2015 engines, added a 4-cylinder mode that idles one cylinder on each bank. VCM-3, on the direct-injected J35Y engines from around 2013–2014 onward, went back to 3 or 6. The harness works the same way on all of them, since each version waits for the engine to be warm before switching.

Common reasons to disable VCM

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.

What to expect

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.

Check the engine first

Start with a healthy engine: no check-engine light, coolant at the correct level, a thermostat that opens normally and no misfire history. The harness relies on a working ECT1 sensor; if that sensor is faulty, replace it before installing the harness.

Before ordering

• Your model and year match a row above (2014–2020, 2022–2026 Acura MDX).
• 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.

Warranty and returns

Standard shipping inside the lower 48 states costs nothing; allow 1–2 business days of handling plus 3–4 in transit. Returns need approval first and must be requested within 45 days. Approved returns are subject to a 20% restocking fee, with return shipping paid by the customer. A 3-year limited warranty applies. Email support@automotivebypass.com (Mon–Fri, 9–5 PST) with your VIN if you want a fitment check.