Removing the V-max (speed limiter)

What is a “Vmax” or speed limiter?

Some vehicles, especially vans or transport vehicles, are delivered with a speed limiter, often set between 90 and 140 km/h.

This limiter is not a bug: it is intentionally installed by the manufacturer, a leasing company, or a fleet operator in order to reduce fuel consumption, noise, or accident risk.

Two types of limitations exist

It is important to understand where the limiter is applied, as this changes everything regarding how it is removed:

1. Vmax coded in the engine file (ECU)

This is a limitation written directly into the engine map.

➜ In this case, it can be removed by modifying the ECU file during a standard remap.

2. Vmax set via diagnostic (“coding”)

In most cases, especially on modern commercial vehicles, the limiter is not inside the engine file but is added afterward using a manufacturer diagnostic tool once the vehicle has been delivered.

This type of limiter does not modify the engine file and does not affect control values (CVN).

➜ It must therefore be disabled via diagnostic, using a manufacturer tool or a professional advanced coding tool.

Why removal does not always work after a remap

Because the vehicle can be limited outside of the engine ECU.

Even if the file has been modified (and the “Vmax Off” option applied in the map), the limitation will remain active as long as the diagnostic coding has not been removed with the appropriate tool.

In simple terms: If your vehicle is still limited to 105 km/h after a full remap, it is most likely a diagnostic coding issue, not an ECU map problem.

How to identify the source of the limitation

• If the vehicle has never exceeded the current speed, even before any remap → it is likely diagnostic-coded
• If the vehicle has previously driven faster → the limiter is probably in the ECU file and can be removed via remap

How to fully remove it

For a complete removal:

1. ECU remap (if present in the file): performed by us during file processing.
2. Removal of diagnostic coding:

Must be done using a manufacturer tool (Renault Clip, Ford IDS, VAG ODIS, etc.) or a professional diagnostic tool with advanced coding functions.

Workshops using only basic universal OBD tools cannot remove this type of coding.

Summary:

Conclusion

The “Vmax Off” option included in our files removes any limitation present in the engine control unit.

If your vehicle remains limited after the intervention, the diagnostic coding must be checked: most modern commercial vehicles (Renault Master, Peugeot Boxer, Ford Transit, etc.) use this method.

Once the limiter is disabled via diagnostics, the maximum speed will be fully available according to the engine configuration.