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Air Suspension Malfunction on my 2020 QX80 – Sagging Rear

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Brian F. · rep 0 · May 22, 5:09 AM · 1 replies · solved · Question

Vehicle: 2020 Infiniti QX80 LUXE

Hello forum,

I'm experiencing a worrying issue with my 2020 Infiniti QX80. The rear of the vehicle seems to be sagging, especially after it's been parked overnight. When I start it up, it sometimes takes a while for the rear to level out, and other times it just stays noticeably lower than the front. I've also heard a faint humming noise from the rear when the car is trying to adjust its height.

This is making me nervous about towing and general ride quality. Is this a common problem for the QX80's air suspension system? What components usually fail? I'm hoping it's not a super expensive fix, but I want to get it sorted before it causes more damage.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:09 AM

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ClearTheCode admin answer:

Sagging rear suspension and a humming noise on your 2020 Infiniti QX80 are classic symptoms of a problem within the self-leveling rear air suspension system. This system is designed to maintain a consistent ride height, especially under load or when towing. When it fails, it can significantly impact ride quality, handling, and safety.

Here are the common culprits:

  1. Air Leaks: The most frequent cause is a leak in the air springs (air bags) themselves. Over time, the rubber can crack or develop pinholes, allowing air to escape, especially when parked. Leaks can also occur in the air lines or at the connections.
  2. Air Compressor Failure: The humming noise you hear could be the air suspension compressor struggling or running excessively to try and compensate for a leak. If the compressor is failing, it won't be able to generate enough pressure to lift the vehicle, or it might run constantly and eventually burn out.
  3. Height Sensor Malfunction: Sensors monitor the vehicle's height and tell the compressor when to activate. A faulty height sensor could send incorrect readings, leading to improper leveling.
  4. Relay/Fuse Issues: Less common, but a blown fuse or a faulty relay for the compressor could prevent it from operating correctly.

Diagnostic Codes: A scan tool might reveal codes such as:

  • C1109: Air Suspension Compressor Malfunction
  • C1108: Air Suspension System Malfunction (general)
  • C1107: Rear Height Sensor Malfunction

When to See a Shop:

You should take your QX80 to an Infiniti dealership or a specialized suspension shop as soon as possible. Driving with a compromised air suspension can affect braking, tire wear, and overall vehicle stability. The repair typically involves replacing the faulty air springs, the compressor, or the height sensors, depending on the diagnosis. Early intervention can prevent the compressor from being overworked and failing prematurely, which can be a more expensive component to replace.

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