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PASM Fault Light on 2020 911 Carrera S - What gives?

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Chris P. · rep 0 · May 25, 4:50 AM · 1 replies · solved · Question

Vehicle: 2020 Porsche 911 Carrera S

Hey everyone,

I'm getting a 'PASM Fault' warning light on my 2020 911 Carrera S. It popped up yesterday while driving normally, and now the suspension feels noticeably stiffer, almost like it's stuck in Sport mode regardless of my driving mode selection. The car has about 25,000 miles on it and hasn't had any major issues before.

Has anyone experienced this with their 992? What are the common culprits for a PASM fault? Is this something I can troubleshoot myself, or am I looking at an expensive trip to the dealership? Any advice or shared experiences would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:50 AM

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ClearTheCode admin answer:

A PASM (Porsche Active Suspension Management) fault on your 2020 911 Carrera S indicates an issue with the electronically controlled damping system. This system continuously adjusts the damping force on each wheel based on road conditions and driving style, so a fault will often result in a default stiff setting for safety.

Here's what you should consider:

  1. Common Causes:

    • Sensor Malfunction: Each shock absorber has a sensor that provides data to the PASM control unit. A faulty sensor or its wiring can trigger a fault.
    • Wiring Issues: Damaged or corroded wiring harnesses leading to the shock absorbers or the control unit can interrupt communication.
    • PASM Control Unit Failure: While less common, the control module itself can fail.
    • Shock Absorber Leak/Failure: If a shock absorber is physically damaged or leaking, it might not respond correctly to PASM commands, triggering a fault.
    • Ride Height Sensor Issues: Although primarily for air suspension, some PASM systems integrate ride height data, and a faulty sensor here could cause issues.

  2. Diagnostic Steps (DIY & Professional):

    • Visual Inspection: Check for any obvious damage to the shock absorbers, wiring, or connectors around the wheels. Look for fluid leaks from the shocks.
    • Check for OBD Codes: A professional diagnostic tool (like a PIWIS tester at a Porsche dealer or an advanced OBD-II scanner) can read specific fault codes related to the PASM system. Common codes might include P1603 (Control Module Malfunction) or specific C-series chassis codes related to individual damper sensors.
    • Battery Check: Sometimes, low voltage can cause various electronic glitches. Ensure your car's battery is in good health.

  3. When to See a Shop:

    • Immediately: If the fault persists after a simple restart, or if you notice any unusual handling characteristics beyond just stiffness.
    • For Diagnosis: A Porsche specialist or dealership has the specific diagnostic tools required to pinpoint the exact sensor, wiring, or control unit that's causing the problem. Attempting to replace parts without proper diagnosis can be costly and ineffective.
    • For Repair: PASM components are complex and critical for handling. Repairs should always be performed by qualified technicians using genuine Porsche parts.
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