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Air Suspension Compressor Failure on my 2018 Ram 1500 Laramie - Help!

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Chris P. · rep 0 · May 25, 2:34 AM · 1 replies · solved · Question

Vehicle: 2018 Ram 1500 Laramie

Hey everyone, I'm having a major headache with my 2018 Ram 1500 Laramie. The air suspension has been acting up for a few weeks now, and yesterday it completely failed. The truck is sitting super low, especially in the rear, and I'm getting a 'Service Air Suspension' message on the dash.

I've tried checking fuses, but no luck. It sounds like the compressor might be shot, as I don't hear it trying to inflate anymore. Has anyone else experienced this with their 2018 Ram? What was the fix?

Is this a common reliability issue for this model year? I'm worried about the cost of replacement parts and labor. Any advice on troubleshooting or what to expect at the dealership would be greatly appreciated. Thanks!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:34 AM

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ClearTheCode admin answer:

Air suspension compressor failures are a known issue on some Ram 1500 trucks, particularly in certain model years including 2018. This system is complex and relies on several components working in harmony.

  1. Common Causes:

    • Compressor Wear: Over time, the compressor motor can simply wear out, especially if it's overworked due to leaks in the system.
    • Relay Failure: A faulty relay can prevent power from reaching the compressor, mimicking a compressor failure. This is a cheaper fix to check first.
    • Air Leaks: Small leaks in the air springs, lines, or valve block can cause the compressor to run excessively, leading to premature failure.
    • Moisture Ingress: Moisture can get into the system, freeze, and damage internal components of the compressor or valve block.

  2. Troubleshooting & Diagnostics:

    • Visual Inspection: Look for visible damage to air lines or air springs.
    • Listen for Leaks: With the engine off, listen for hissing sounds around the air springs and lines.
    • OBD-II Codes: While not always present, a failing air suspension system can trigger codes like C15AB (Air Suspension Compressor Control Circuit), C15AA (Air Suspension Compressor Over Temperature), or C15AD (Air Suspension System Malfunction). A professional scan tool can provide more specific diagnostic codes.

  3. When to See a Shop:

    • You should see a qualified technician as soon as possible. Driving with a failed air suspension can affect handling, tire wear, and potentially damage other suspension components.
    • A shop can perform a thorough diagnostic, including checking for leaks with soapy water, testing the compressor's electrical circuit, and using a specialized scan tool to identify the exact fault.
    • Replacing the compressor can be a significant expense, often ranging from $800 to $1500 or more for parts and labor, depending on whether you use OEM or aftermarket parts. It's crucial to identify the root cause (e.g., a leak) to prevent the new compressor from failing prematurely.
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