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2018 Discovery Air Suspension Fault - Dropping Overnight?

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Brian F. · rep 0 · May 22, 6:28 AM · 1 replies · solved · Question

Vehicle: 2018 Land Rover Discovery HSE Luxury

Hey everyone, hoping for some help here. I've got a 2018 Land Rover Discovery HSE Luxury, and lately, I've been getting an 'Air Suspension Fault' message on the dash.

The weirdest part is that sometimes after sitting overnight, the front end, or sometimes just one side, seems to drop significantly. When I start it up, the compressor kicks in, and it usually levels out, but the ride feels much stiffer than usual.

Has anyone experienced this with their Discovery? What should I be looking for? Is this a common issue with these models? Any advice on troubleshooting before I take it to the dealer would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 6:28 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 Luxury. This can be frustrating, but often the cause can be narrowed down.

Here are the typical causes and steps to consider:

  1. Air Leak: The most frequent culprit is a leak in the air spring (air bag) itself, an air line, or a valve block.

    • Symptoms: Vehicle dropping overnight or after sitting, especially on one side or corner. The compressor runs more frequently.
    • Diagnosis: You can try spraying soapy water on the air springs and connections to look for bubbles, which indicate a leak.

  2. Air Suspension Compressor Issues: The compressor is responsible for pumping air into the system. If it's weak or failing, it might struggle to maintain pressure.

    • Symptoms: Slow to raise the vehicle, excessive noise from the compressor, or the vehicle not raising at all.
    • Diagnosis: Check for error codes. A common code related to the compressor is C1A20-64 (Pressure increases too slowly when filling reservoir) or C1A00-16 (Control module - circuit voltage below threshold).

  3. Ride Height Sensor Malfunction: These sensors tell the control module the vehicle's height. A faulty sensor can give incorrect readings, leading to uneven suspension or fault messages.

    • Symptoms: One corner consistently higher or lower than others, or intermittent fault messages without a visible drop.
    • Diagnosis: A diagnostic scan tool can read live data from the height sensors to check for inconsistent readings.

  4. Valve Block Fault: The valve block directs air to and from the individual air springs. If it's sticking or faulty, it can cause air to leak or not reach certain springs.

When to See a Shop: If you're getting persistent fault messages, the vehicle is unsafe to drive due to severe height issues, or you're unable to diagnose the leak yourself, it's best to take it to a qualified Land Rover specialist. They have specific diagnostic tools (like JLR SDD or Pathfinder) that can pinpoint the exact fault, recalibrate the system, and perform necessary repairs safely. Driving with a severe air suspension fault can lead to premature wear on other components and compromise handling.

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