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2020 Ram 1500 Rebel Air Suspension Sagging & Compressor Running Constantly

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Mike T. · rep 0 · May 25, 2:29 AM · 1 replies · solved · Question

Vehicle: 2020 Ram 1500 Rebel

My 2020 Ram 1500 Rebel, which has the factory air suspension, has been acting up lately. The rear end seems to sag overnight, and I often hear the air compressor running for extended periods, even when parked, trying to level the truck.

Sometimes I even get a "Service Air Suspension" message on the dash, but it usually goes away after a while. What should I be looking for? Is this a common problem with these trucks? It has about 60,000 miles on it.

I'm hoping it's something simple, but I'm worried it might be an expensive fix.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:29 AM

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ClearTheCode admin answer: Experiencing sagging and a constantly running compressor on your 2020 Ram 1500 Rebel's air suspension system, along with a "Service Air Suspension" message, points to a common set of problems with these systems. The air suspension system relies on a delicate balance of pressure and sealed components.

Here are the primary causes and what to investigate:

  1. Air Leaks: This is the most frequent issue. Leaks can occur in:
    • Air Springs (Air Bags): Over time, the rubber can crack or develop pinholes.
    • Air Lines/Fittings: Plastic air lines can crack, or the connections/fittings can become loose or damaged.
    • Solenoid Valves: Valves that control air flow to each bag can leak internally or externally.
  2. Faulty Height Sensors: The system uses sensors to monitor the truck's ride height. If a sensor fails or becomes miscalibrated, it can send incorrect signals, causing the system to over-inflate, under-inflate, or constantly try to adjust, leading to the compressor running excessively.
  3. Air Compressor Failure: If the compressor runs constantly but can't maintain pressure, it might be failing or worn out. Constant running due to a leak can also lead to premature compressor failure.

Common OBD Codes related to Air Suspension:

  • C1501: Air Suspension Compressor Control Circuit Malfunction
  • C1502: Air Suspension Solenoid Valve Control Circuit Malfunction
  • C1503: Air Suspension System Pressure Sensor Malfunction
  • C1504: Air Suspension Height Sensor Malfunction

What you can check:

  • Visual Inspection: Look for any obvious damage to the air springs or air lines. You can sometimes use a spray bottle with soapy water to find leaks (look for bubbles).
  • Check for OBD Codes: Using an OBD-II scanner, retrieve any stored codes to narrow down the problem.

When to see a shop: Air suspension systems can be complex to diagnose and repair. If you're not comfortable with automotive diagnostics, or if you can't easily locate a leak, it's best to take your Ram to a qualified mechanic. They have specialized diagnostic tools and expertise to pinpoint the exact failure point and ensure proper repair, which is crucial for maintaining your truck's ride quality and handling.

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