Range Rover ASL fault

As a seasoned Range Rover owner, I am well aware of the vehicle’s infamous inclination toward experiencing reliability issues.

It seems like every time I take my Range Rover out for a spin, I encounter a new problem.

One of the most frequent issues that I have come across, and one that anyone who has experienced it will attest to, is the dreaded Range Rover ASL Fault.

What models are affected?

Signs and symptoms

The Range Rover ASL Fault is a warning light that appears on the dashboard and signifies an issue with the Anti-Lock Braking System (ASL).

This light usually illuminates when you attempt to start your vehicle or when you turn your steering wheel while idling.

If you notice this light come on, it’s imperative to take immediate action to address the problem.

List of possible OBD codes

When you encounter the Range Rover ASL Fault, the OBD (On-Board Diagnostic) system of your vehicle will likely display one of several codes, including C1117, C1192, and C1A78.

These codes indicate specific problems with the Anti-Lock Braking System and offer a starting point for diagnosis.

Common causes

Several factors can cause the Range Rover ASL Fault to appear, including:

  • Damaged wheel speed sensor: This sensor is responsible for providing your Range Rover’s computer with information about the vehicle’s wheel speed. Any damage to this sensor can cause the ASL Fault light to turn on.
  • Failed ABS module: The ABS module is responsible for controlling the ASL system’s hydraulic functions, and a failure in this component can trigger the ASL Fault.
  • Microswitch failure: The ASL system features microswitches that let the computer know the exact position of the brake pedal. Any malfunction in these switches can cause the ASL Fault light to turn on.

Can it be fixed without a mechanic?

While it’s always advisable to have a professional mechanic take a look at a problem like the Range Rover ASL Fault, some minor issues can be solved without going to the garage.

For example, a loose or corroded ground wire can often be tightened or replaced, turning off the warning light without any significant repairs.

Parts you’ll need to fix it

If the ASL Fault is a more severe issue, you’ll likely need to replace certain parts.

The most common components that require replacement in the case of ASL Faults includes:

  • The wheel speed sensor
  • The ABS module
  • The microswitches

Tools you’ll need to fix it

Fixing an ASL Fault will require some special tools, such as;

  • Diagnostic scanner
  • Jack and Jack stands
  • ABS brake bleed kit
  • Multimeter
  • Various sockets and wrenches.

How to fix it

Fixing the Range Rover ASL Fault involves several steps that include:

  1. Identifying the root cause of the warning light, which will require the use of an OBD scanner.
  2. Cleaning the individual connectors in the ASL system to ensure there is no corrosion.
  3. Checking the brake fluid levels and topping up if necessary.
  4. Testing the wheel speed sensors and the microswitches.
  5. Removing the ABS module and replacing it, if required.

Potential alternative causes

There are several other reasons why the Range Rover ASL Fault light might come on, including issues with;

  • ABS Actuator
  • Brake Pedal Sensor
  • Brake Booster
  • Fuses and Relays.


What does ASL mean in a Range Rover?

ASL stands for the Anti-Lock Braking System.

Why is my ASL Fault light on in my Range Rover?

The ASL Fault light indicates a problem with the Anti-Lock Braking System in your Range Rover.

Can I still drive with an ASL Fault warning light on my dashboard?

While it is possible to drive with the ASL Fault light on, it’s not advised. The driver is more susceptible to an accident if the ABS is not working correctly.


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