The largest online repair guide library for every car

About us
Contact support
FAQ
Sign up
Sign in

2018 Discovery Air Suspension Fault - Compressor or Leak?

0

Tom H. · rep 0 · May 22, 6:37 AM · 1 replies · solved · Question

Vehicle: 2018 Land Rover Discovery HSE

Hey everyone,

I'm having a persistent issue with the air suspension on my 2018 Land Rover Discovery HSE. Lately, I've been getting an 'Air Suspension Fault' message on the dash, and the ride quality has definitely deteriorated. Sometimes it feels like the vehicle is sitting lower than usual, especially after being parked overnight.

I've noticed the front passenger side seems to sag more than the driver's side. The compressor also seems to be running more frequently and loudly than it used to. I'm worried this might be a major repair.

Is this a common problem for the 2018 Discovery? What are the usual culprits? I'm trying to figure out if it's just a leaky air spring, a failing compressor, or something more complex. Any advice on diagnosing this myself before taking it to a specialist would be greatly appreciated. What kind of costs am I looking at for parts and labor?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 6:37 AM

0

ClearTheCode admin answer:

An 'Air Suspension Fault' on your 2018 Land Rover Discovery HSE is a common concern, often stemming from a few key areas. Addressing this promptly is crucial for both ride comfort and safety.

  1. Common Causes:

    • Air Compressor Failure: The air suspension compressor is responsible for pressurizing the system. Over time, components like the piston ring or dryer can wear out, leading to reduced efficiency or complete failure. Symptoms include the compressor running constantly, being excessively loud, or the vehicle failing to raise.
    • Air Spring Leaks: The air springs (often called air bags or struts) can develop leaks due to age, road debris, or manufacturing defects. This is a very common cause of sagging, especially overnight or on one side.
    • Air Line Leaks: The plastic air lines connecting the compressor, valve block, and air springs can crack or become dislodged, causing pressure loss.
    • Valve Block Malfunction: The valve block directs air to and from the individual air springs. If it fails, it can cause uneven ride height or prevent the system from operating correctly.
    • Height Sensor Issues: Faulty height sensors can send incorrect signals to the air suspension control module, leading to incorrect ride height adjustments.

  2. Diagnostic Steps (DIY & Shop):

    • Visual Inspection: Check for obvious signs of damage to the air springs (cracks, tears) or air lines. Look for moisture around connections.
    • Soap Test: Spray soapy water on suspected leak areas (air springs, connections) and look for bubbles forming when the system is pressurized.
    • Listen for Leaks: With the engine off and doors closed, listen carefully for hissing sounds around the wheels.
    • Check Fuses/Relays: Ensure the air suspension compressor fuse and relay are intact and functioning.
    • OBD-II Scan: A diagnostic scan tool capable of reading Land Rover-specific codes is essential. Common codes related to air suspension include:
      • C1A20-1C: Pressure sensor fault.
      • C1A00-1C: General air suspension system fault.
      • C1A36-01: Exhaust valve fault.
      • C1A20-64: Pressure sensor correlation fault.

  3. When to See a Shop:

    • If you've performed basic checks and can't identify the issue.
    • If the vehicle is severely sagging or unsafe to drive.
    • If you receive persistent 'Air Suspension Fault' messages.
    • For accurate diagnosis and repair, especially involving specialized tools or programming. A Land Rover specialist or dealership will have the necessary diagnostic equipment (like SDD or Pathfinder) to pinpoint the exact fault.

Repair costs can vary significantly. An aftermarket air spring might be a few hundred dollars, while an OEM compressor can be over a thousand, plus labor. Addressing this early can prevent further damage to the system.

Menu

Help & account