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2020 Ram 1500 Air Suspension Malfunction - Compressor Running Constantly

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Laura J. · rep 0 · May 22, 3:38 AM · 1 replies · solved · Question

Vehicle: 2020 Ram 1500 Limited

Hello Ram owners,

I'm having a major headache with the air suspension on my 2020 Ram 1500 Limited. For the past few days, I've been getting a 'Service Air Suspension' message on the dash, and it feels like the truck isn't leveling properly. The worst part is, I can hear the air compressor running almost constantly, even when the truck is parked and off for a while.

I'm worried about burning out the compressor or something worse. It's a 2020 Ram 1500 Limited with about 60,000 miles. Has anyone experienced this specific issue? Could it be a leak, or is the compressor itself failing? What are the common failure points for the air suspension system on these trucks?

Any insights or advice on what I should check before taking it to the dealer would be greatly appreciated. Thanks in advance!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:38 AM

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ClearTheCode admin answer:

Experiencing a 'Service Air Suspension' message and a constantly running compressor on your 2020 Ram 1500 Limited points to a common set of issues within the active-level four-corner air suspension system. The constant compressor operation indicates the system is struggling to maintain pressure, usually due to a leak or a failing component.

  1. Identify the Root Cause:

    • Air Leaks: This is the most frequent cause. Leaks can occur in the air springs (air bags), air lines, or at the solenoid block. A small leak will cause the compressor to work harder and longer to compensate.
    • Compressor Failure: While the compressor running constantly is often a symptom of a leak, the compressor itself can fail. If it's running but not building adequate pressure, or if it's excessively noisy, it might be weak or failing.
    • Height Sensor Malfunction: The system relies on height sensors at each wheel to determine the truck's level. A faulty sensor can send incorrect readings, causing the system to try and adjust unnecessarily.
    • Solenoid Block Issues: The solenoid block directs air to and from the air springs. A faulty solenoid can stick open or closed, leading to pressure loss or inability to adjust a specific corner.

  2. Common OBD-II Codes: A diagnostic scan will likely reveal codes related to the air suspension system, such as:

    • C15AA: Air Suspension Compressor Control Circuit
    • C15AB: Air Suspension Pressure Sensor Circuit
    • C15AE: Air Suspension System Performance
    • C15AF: Air Suspension Solenoid Valve Control Circuit

  3. Troubleshooting Steps (Limited):

    • Visually inspect the air springs for any obvious tears or cracks. You can also spray soapy water on the air springs and lines to look for bubbles indicating a leak.
    • Check the fuse for the air suspension compressor. A blown fuse would prevent it from running at all, but a constantly running compressor suggests it's trying to work.

When to See a Shop:

  • Immediately. A constantly running compressor will eventually burn out, leading to a much more expensive repair. Moreover, driving with compromised suspension can affect handling and safety.
  • A professional shop or dealership has specialized diagnostic tools to pinpoint the exact location of a leak, test compressor efficiency, and check sensor readings accurately. They can also perform necessary repairs or replacements of components like air springs, lines, or the compressor itself.
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