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2018 Discovery HSE Air Suspension Fault - Dropping Overnight?

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Tom H. · rep 0 · May 22, 6:30 AM · 1 replies · solved · Question

Vehicle: 2018 Land Rover Discovery HSE

Hey everyone,

I'm having a really frustrating issue with my 2018 Land Rover Discovery HSE. Lately, I've noticed that after parking it overnight, the rear (and sometimes the front) seems to drop significantly. When I start it up, I get an an 'Air Suspension Fault' message on the dash, and it takes a while for the system to pump up.

The ride quality has also become noticeably harsher, especially over bumps. It feels like the suspension isn't absorbing impacts like it used to. I'm worried about driving it like this.

Has anyone experienced something similar with their Discovery? What could be causing this? Any tips on what I should check before taking it to the dealer?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 6:30 AM

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ClearTheCode admin answer:

It sounds like you're dealing with a common air suspension issue on your 2018 Land Rover Discovery HSE. The symptoms you describe – vehicle dropping overnight, 'Air Suspension Fault' message, and a harsh ride – strongly suggest a problem within the air suspension system.

Here are the most common causes and what you should consider:

  1. Air Spring Leaks: The most frequent culprit is a leak in one or more of the air springs (also known as air bags or air struts). Over time, these can develop cracks or punctures, allowing air to escape, especially when the vehicle is parked. This causes the vehicle to sag.
  2. Air Compressor Issues: The air suspension compressor is responsible for supplying air to the system. If it's failing, it might struggle to inflate the springs, leading to slow recovery or complete system failure. You might hear it running excessively or not at all.
  3. Height Sensor Malfunction: The vehicle's height sensors tell the control module the current ride height. A faulty sensor can send incorrect readings, causing the system to misadjust or throw a fault.
  4. Air Line Leaks or Valve Block Issues: Less common but still possible are leaks in the air lines themselves or a faulty valve block, which directs air to the individual springs.

What to check:

  • Visual Inspection: Look for any obvious damage or cracks on the air springs, especially when the vehicle is lowered.
  • Listen for Leaks: With the engine off, listen closely around the air springs and lines for any hissing sounds. You can also spray a soapy water solution on suspected areas to identify bubbles.
  • OBD-II Codes: A diagnostic scan tool can pull specific codes related to the air suspension system. Common codes include:
    • C1A20: Pressure sensor fault.
    • C1A00: General air suspension system fault.
    • C1A13: Pressure increases too slowly when filling reservoir.

When to see a shop: It's highly recommended to have your Land Rover inspected by a qualified technician as soon as possible. Driving with a compromised air suspension can lead to:

  • Further Damage: The air compressor might overwork and fail prematurely.
  • Safety Concerns: Reduced handling stability and braking performance, especially at higher speeds or during emergency maneuvers.
  • Tire Wear: Uneven ride height can cause premature and uneven tire wear.

A specialized Land Rover shop will have the diagnostic tools to pinpoint the exact cause and perform the necessary repairs, which often involve replacing the faulty air springs or compressor.

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