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2021 V90 Cross Country Rear Air Suspension Sagging - Service Required Message

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Chris P. · rep 0 · May 22, 5:18 AM · 1 replies · solved · Question

Vehicle: 2021 Volvo V90 Cross Country B6

Hi everyone,

I'm having an issue with the rear air suspension on my 2021 Volvo V90 Cross Country B6. Lately, I've noticed the rear of the car seems to be sagging, especially after it's been parked overnight. When I start it up, I can hear the air compressor running for a while, but it doesn't always seem to fully level out.

I've also started getting a 'Suspension Service Required' message on the dashboard. This is a relatively new car, and I'm surprised to be having this problem already. Is this a common fault with the air suspension on these models?

What should I expect when I take it to the dealer? Any specific things I should ask them to check?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:18 AM

0

ClearTheCode admin answer:

  1. Diagnose the Issue: The symptoms you describe – rear sagging, compressor running excessively, and a 'Suspension Service Required' message – are classic signs of a fault in the rear air suspension system of your 2021 Volvo V90 Cross Country. This is a known area of concern for some Volvo models equipped with air suspension.

  2. Check for OBD Codes: While a generic OBD-II scanner might not show specific suspension codes, a professional Volvo diagnostic tool will likely reveal codes from the Suspension Control Module (SUM). Common codes related to air suspension issues include:

    • C1A00 (General Electrical Fault): A broad code indicating an electrical issue within the system.
    • C1A20 (Pressure Sensor Fault): Indicates a problem with the pressure sensor that monitors air spring pressure.
    • C1A30 (Air Spring Leak): Directly points to a leak in one or both air springs.
    • C1A40 (Compressor Fault): Indicates the compressor is not functioning correctly or is overworked.

  3. Causes: The most common causes for these issues in Volvo air suspension systems are:

    • Air Spring Leaks: The rubber air springs (often called air bags or air bellows) can develop small leaks over time, especially at the folds or where they connect to the strut. This allows air to escape, causing the vehicle to sag.
    • Compressor Failure: The air suspension compressor can wear out from overuse (due to a leak) or simply fail internally.
    • Valve Block Malfunction: The valve block controls air distribution to the springs and can sometimes stick or leak.
    • Sensor Issues: Height sensors or pressure sensors can fail, providing incorrect readings to the control module.

  4. Known TSBs/Recalls: While not a widespread recall, there have been TSBs (Technical Service Bulletins) related to air suspension components and software updates for various Volvo models. It's worth asking the dealer if any apply to your VIN.

  5. When to See a Shop: Given the 'Suspension Service Required' message and the potential for further damage (e.g., to the compressor from overworking), you should take your V90 Cross Country to a Volvo dealership or a specialist immediately. Explain the symptoms clearly. They will need to:

    • Perform a diagnostic scan of the Suspension Control Module (SUM) for fault codes.
    • Visually inspect the air springs for cracks or damage.
    • Check for air leaks using a soapy water solution or a smoke machine.
    • Test the air compressor's functionality and output.
    • Verify the operation of the height sensors and valve block. This is not a DIY repair, as it involves specialized tools and knowledge of the complex air suspension system.
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