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Adaptive Air Suspension Fault on 2017 A6

0

Jennifer H. · rep 0 · May 22, 4:25 AM · 1 replies · solved · Question

Vehicle: 2017 Audi A6 3.0T Competition

Hi all,

My 2017 Audi A6 3.0T Competition (with adaptive air suspension) just threw an error message: "Adaptive Air Suspension: System Fault!" The car seems to be sitting a bit lower than usual, especially on one side, and the ride feels much stiffer. I tried restarting the car, but the message comes back.

I scanned it with a basic OBD reader and got a P0456 code, but I'm not sure if that's related to the suspension or something else entirely. Has anyone experienced this with their A6? What could be the cause, and is it safe to drive?

Thanks for the help!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:25 AM

0

ClearTheCode admin answer:

An "Adaptive Air Suspension: System Fault!" message on your 2017 Audi A6 is a serious indication that the system is not functioning correctly. The P0456 code you mentioned is for an Evaporative Emission System Leak Detected (very small leak) and is unrelated to your air suspension issue. You'll likely need an Audi-specific scanner (like VCDS or ODIS) to pull relevant suspension fault codes (e.g., starting with 'C' for chassis).

  1. Common Causes of Air Suspension Faults:

    • Air Leak: This is one of the most common issues. Leaks can occur in the air springs (bags), air lines, or valve block. A leak will cause the system to work harder, potentially leading to compressor failure.
    • Air Suspension Compressor Failure: The compressor is responsible for pumping air into the system. If it fails, the car won't be able to adjust its height. This can happen due to age, overuse (often from a leak), or electrical issues.
    • Level Sensor Malfunction: Each corner of the car has a height level sensor. If a sensor fails or becomes miscalibrated, the control module won't know the correct height and can't adjust the suspension properly.
    • Valve Block Issues: The valve block directs air to and from the individual air springs. A faulty valve block can cause one or more corners to sag.
    • Control Module Failure: While less common, the air suspension control module itself can fail.
    • Electrical Issues: Wiring problems or blown fuses related to the air suspension system can also trigger a fault.

  2. Immediate Actions & Diagnostics:

    • Avoid Driving Long Distances: Driving with a faulty air suspension, especially if the car is sitting low, can damage tires, other suspension components, and potentially be unsafe.
    • Visual Inspection: Look under the car for any obvious signs of damage to the air springs or air lines. Listen for hissing sounds when the car is running, which could indicate an air leak.
    • Scan with Audi-Specific Tool: A generic OBD-II scanner won't provide the necessary diagnostic trouble codes (DTCs) for the air suspension system. You need a VCDS (VAG-COM Diagnostic System) or similar tool to read chassis-specific codes (e.g., C103100 for compressor fault, C104100 for level sensor).

  3. When to See a Shop:

    • Immediately. An air suspension fault is not something to ignore. Driving with a compromised suspension can be dangerous and lead to more expensive repairs.
    • A specialized Audi shop or dealership has the diagnostic equipment and expertise to accurately pinpoint the cause of the fault, whether it's a leak, compressor, sensor, or valve block, and perform the necessary repairs or replacements. They can also recalibrate the system after repairs.
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