Range Rover emergency brake assist is not available

If the Range Rover’s emergency brake assist is not available, it may be due to a malfunction or system error. It’s advisable to have the vehicle inspected by a qualified mechanic or contact the dealership for diagnostics and potential repairs to ensure the system’s functionality.

Read on to see the possible causes and signs of when a Range Rover shows the warning of brake assist is not available.

What models are affected?

Signs and symptoms

When you encounter the “Emergency Brake Assist not available” error message, you may also notice several other symptoms that indicate the issue.

Some of these include:

  • The Emergency Brake Warning Light appearing on your dashboard
  • You lose the Adaptive Cruise Control function
  • The Forward Alert system does not function correctly
  • You can feel a decrease in the overall performance of your car

If you experience any of these issues, especially those accompanied by the error message.

It’s safe to assume that you’re dealing with an issue related to your emergency brake assist system.

List of possible OBD codes

When you run an OBD scan on your Range Rover, you might receive any of the following codes related to the Emergency Brake Assist:

  • C1A20 – Brake Pressure Transducer RF Circuit Failure
  • C1A48 – Brake Pressure Transducer RF Circuit Short To Ground
  • C1A21 – Brake Pressure Transducer RF Circuit Short To Battery
  • C1A22 – Brake Pressure Transducer RF Output Short To Battery
  • C1A23 – Brake Pressure Transducer RF Output Short To Ground
  • C1A1C – Brake Pressure Transducer RR Circuit Failure
  • C1A4C – Brake Pressure Transducer RR Circuit Short To Ground
  • C1A1D – Brake Pressure Transducer RR Circuit Short To Battery
  • C1A1E – Brake Pressure Transducer RR Output Short To Battery
  • C1A1F – Brake Pressure Transducer RR Output Short To Ground

Buying guide: Best Land Rover OBD2 scanner tools

Common causes

Several issues can cause the “Emergency Brake Assist not available” error message to appear.

Here’s a list of the most common ones:

1. Brake pressure switch malfunction

If your brake pressure switch is faulty, the system will not recognize when you engage the brake pedal and trigger the brake assist system.

2. Low battery voltage

The Emergency Brake Assist system requires a specific level of battery voltage to function correctly.

If the battery is low on charge, the system may not work correctly.

3. Faulty radar module

The Emergency Brake Assist system works in collaboration with the radar module, responsible for detecting objects in front of your car.

If the module is defective, the system will not work accurately, and you’ll receive an error message.

4. Damaged wiring

Wires within the Emergency Brake Assist system may become damaged, short-circuited, or disconnected, causing problems with the system.

Can it be fixed without a mechanic?

Yes, in some cases, you can fix the “Emergency Brake Assist not available” error message without the help of a mechanic.

However, this depends on the underlying issue causing the error message.

If you’re confident in your mechanical abilities, you can try checking the brake pressure switch, inspecting the wiring, or testing the battery’s voltage level.

However, you may need to consult a professional mechanic if you’re not confident or the issue is more severe.

Parts you’ll need to fix it

Depending on the issue’s underlying cause, you may need some or all of the following parts to fix the “Emergency Brake Assist not available” error message:

  • Brake Pressure Switch
  • Radar Module
  • Wires and Connectors
  • Battery

Tools you’ll need to fix it

Here’s a list of tools you might need to fix the “Emergency Brake Assist not available” error message:

  • OBD Scanner
  • Basic tools for opening the engine compartment and accessing the brake pedal
  • Multimeter to test battery voltage
  • Soldering Iron and Wiring tools

How to fix it

Here is a step-by-step guide for fixing the “Emergency Brake Assist not available” error message:

1. Use an OBD scanner to read the error codes and determine the underlying cause.
2. Check the battery voltage level. If it’s low, you may need to replace or recharge the battery.
3. Inspect the brake pressure switch to ensure it’s functioning correctly. Replace if necessary.
4. Check the wiring within the Emergency Brake Assist system for damages, short circuits, or disconnections. If there are any issues, repair or replace the wires.
5. Inspect the radar module for damage or defects. Replace if necessary.
6. If necessary, recalibrate the system using your OBD scanner.
7. Test the system to ensure it’s functioning correctly.

Potential alternative causes

While the above-listed causes are the most common reasons for the “Emergency Brake Assist not available” error message, there could be other underlying issues causing the problem.

Some potential alternative causes include:

If you’ve tried all of the above-listed solutions and the issue persists, you may need to take your car to a professional mechanic.

FAQs

What is the Range Rover Emergency Brake Assist system responsible for?

The Range Rover Emergency Brake Assist system provides extra braking force in case of an emergency to help you stop the car quickly.

Do I need to replace the whole radar module if it’s defective?

In most cases, yes, you’ll need to replace the whole radar module if it’s defective as opposed to repairing it.

Can I still drive my car with the “Emergency Brake Assist not available” message?

Yes, you can still drive your car with the message present. However, it’s essential to get the issue fixed as soon as possible to ensure the safety of yourself and others on the road.

Summary

If you’re experiencing an “Emergency Brake Assist not available” issue with your Range Rover, several underlying causes could be triggering it.

By following the above-listed steps, you can identify the cause of the problem and fix it efficiently.

Whether you’re tackling the issue yourself or going to a professional technician, always prioritize the safety of everyone on the road.

Last updated and verified on 6th September 2023

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