Active Suspension System Malfunction
What does C0252 mean?
The C0252 code means the vehicle's onboard diagnostic system has detected: Active Suspension System Malfunction. This is a moderate severity code.
Common Symptoms
- Service ride control or suspension warning message
- Rough or harsh ride quality
- Vehicle sits lower on one corner
- Suspension does not adapt to road conditions
- Excessive body roll in turns
Probable Causes (Ranked by Likelihood)
- Failed active suspension shock absorber or strut Very High
- Active suspension control module fault High
- Ride height sensor failure Moderate
- Wiring issue to an active suspension component Moderate
- Air supply failure on air suspension equipped vehicles Low
Step-by-Step Diagnostic Procedure
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Scan for DTCs and identify which corner or component is faulting
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Inspect active shocks/struts for leaking fluid
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Check ride height sensors for damage or disconnection
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Test the active suspension solenoid valve resistance on each damper
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Verify the air compressor and lines on air suspension vehicles
Frequently Asked Questions
What is active suspension?
Active suspension systems use electronically controlled shock absorbers that can adjust their damping rate in real time. This improves ride comfort, handling, and stability by adapting to road conditions and driving style.
Can I convert active suspension to standard shocks?
Yes, conversion kits are available for many vehicles. These kits replace the active components with passive shocks and struts and typically include a module bypass or resistor to prevent warning lights.
How much does an active shock absorber cost?
Active shock absorbers are significantly more expensive than conventional ones, typically $200 to $800 per corner depending on the vehicle and type. MagneRide and air suspension components are at the higher end.