How to determine if the vcm is disabled on newer Honda & Acura without an eco light

Applicable Vehicles This validation process applies to the following vehicles, which do not feature an "ECO" light correlated with VCM activation:
  • 2018+ Honda Odyssey
  • 2016–2022 Honda Pilot
  • 2013–2017 Honda Accord
  • 2019–2025 Honda Passport
  • 2017+ Honda Ridgeline
  • 2022+ Acura MDX
  • 2015+ Acura TLX
⚠️ Do Not Rely on the Dashboard "Green Bar" The green ambient light bar on the dashboard of newer Honda models indicates low engine load conditions, not VCM status. While it is possible for VCM to be disabled while the green bar is illuminated, the bar cannot be used as an indicator to validate your VCMTUNER or VCMTUNER II unit.
Required Equipment

To validate that your VCM system is actively disabled, you will need an OBD2 reader capable of reading the Engine Coolant Temperature 1 (ECT1) sensor value on newer models. Because Honda removed the standard ECT1 value from newer vehicle diagnostics, only certain advanced readers can access the updated Honda OIDs by default.

Recommended scanners: BlueDriver, ScanGauge, or AutoEnginuity.
(Note: Some older Veepeak adapters can work if you are able to find and manually enter the proper OIDs via third-party apps.)

The Validation Procedure

Monitor your ECT1 sensor value via your OBD2 scanner under the following driving conditions:

  • In Motion & Warmed Up: When the vehicle is fully warmed up and in motion, the VCM override is actively applied. Your ECT1 sensor value should read a steady 161°F – 165°F. This confirms the VCM system is successfully disabled.
  • At Idle or Ignition On: If the vehicle is sitting at idle, or the engine is off but the ignition is in the "ON" position, the unit will intentionally report the real ECT1 temperature. This ensures the vehicle starts up with the proper values. Once the real ECT1 signal exceeds 160°F and the car returns to motion, the 161°F – 165°F override will re-engage.