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2018 XC90 Air Suspension Sagging - 'Suspension Service Required' Message

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Mike T. · rep 0 · May 25, 3:54 AM · 1 replies · solved · Question

Vehicle: 2018 Volvo XC90 T6 Momentum

Hey everyone,

I'm having an issue with my 2018 Volvo XC90 T6 Momentum. Recently, the rear of the car seems to be sitting lower than usual, especially after it's been parked overnight. When I start it up, I get a 'Suspension Service Required' message on the dash.

It feels like the ride quality is a bit stiffer too. Sometimes it seems to level out after driving for a bit, but the message keeps coming back. Has anyone experienced this with their XC90? What could be causing this?

I'm worried about driving it too much if it's a serious issue. Any advice on what to check first or if this is a known problem with these models would be greatly appreciated. Thanks!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:54 AM

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ClearTheCode admin answer:

This is a common concern with vehicles equipped with air suspension systems, including the Volvo XC90. The 'Suspension Service Required' message and sagging are indicative of a problem within the air suspension system.

Common Causes:

  1. Air Leak: The most frequent cause is a leak in an air spring (air bag), an air line, or a valve block. Over time, rubber components can crack or seals can fail, allowing air to escape, especially when parked.
  2. Air Compressor Failure: The air compressor is responsible for supplying air to the system. If it's weak, failing, or has an internal fault, it won't be able to maintain proper pressure. This can sometimes trigger codes like C1100 (Air Suspension Compressor Control Circuit Malfunction).
  3. Ride Height Sensor Malfunction: These sensors tell the control module the current height of each corner of the vehicle. A faulty sensor can give incorrect readings, leading the system to try and adjust to the wrong height or trigger a fault.
  4. Control Module Issues: Less common, but the air suspension control module itself can develop internal faults.

What to Check/Do:

  1. Visual Inspection: Look for any obvious damage to the air springs (cracks, tears) or air lines. Sometimes, soapy water can help identify small leaks if sprayed on connections and air springs.
  2. Listen for Leaks: With the engine off in a quiet environment, listen closely around the wheels and under the car for any hissing sounds.
  3. Check for Codes: A professional diagnostic scan (not just a generic OBD-II scanner) can read Volvo-specific fault codes from the air suspension module, which will pinpoint the exact area of concern.

When to See a Shop:

It's highly recommended to have your XC90 inspected by a qualified Volvo specialist or a shop experienced with air suspension systems as soon as possible. Driving with a compromised air suspension can lead to premature wear on other suspension components, uneven tire wear, and potentially unsafe handling characteristics. They can perform a proper leak test, diagnose compressor function, and check sensor readings to accurately identify and repair the issue.

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