GMC Hummer EV Mileage Blocker

About the GMC Hummer EV Mileage Blocker

The GMC Hummer EV Mileage Blocker is a plug-in CAN-bus module made specifically for the GMC Hummer EV (2021-2027). It fits in-line on the wiring behind the instrument cluster using connectors that match the factory loom, so there is no cutting, splicing, soldering or software coding. With the module active, the distance signal reaching the cluster is paused or reduced according to the mode you select; the speedometer and everything else on the dash keep working as normal.

Because it works at the wiring level rather than through the OBD port, it does not write anything to the car’s memory, does not trigger warning lights, and can be unplugged at any time to return the vehicle to standard. It is intended for dyno sessions, remapping and testing, track and off-road use, and vehicle development.

Options

• OBD2 / DTC eraser (+$375) – optional companion unit that automatically clears stored fault codes.

Operating modes

1. Mode 1 – Odometer paused – no distance is recorded while the module is active. Speedometer reads normally.
2. Mode 2 – Pass-through – the car records mileage and shows speed exactly as standard.

How to change mode: Flash the high beams 4 times in quick succession.

Compatible vehicles

• Models: GMC Hummer EV Pickup [HEV] (2021, 2022, 2023, 2024, 2025, 2026, 2027)
• GMC Hummer EV SUV [HEV] (2021, 2022, 2023, 2024, 2025, 2026, 2027)

Select the generation and any cluster, connector or display options that match your car before ordering. If you are not sure which version you need, send us your registration or a photo of the instrument cluster and we will confirm the right unit.

What you get

• Vehicle-specific module with factory-style connectors
• Step-by-step fitting guide for your vehicle
• 12-month warranty and technical support

Specifications

Important: this product is for off-road, motorsport, dyno, testing and development use only. It must not be used to misrepresent the mileage of a vehicle that is being sold or otherwise offered to a third party. Check the law that applies where you are before use.