C0312
Air Suspension Air Spring Leak Detected
2001-2005 BMW 330i E46 3.0L I6
Moderate SeverityChassisGeneric (SAE)
Description
The air suspension system has detected an air leak at one or more air spring assemblies.
Symptoms
- Vehicle leaning to one side
- Vehicle sitting low after parking overnight
- Compressor runs frequently
- Suspension warning light
Common Causes
- Cracked air spring rubber bladder
- Leaking air spring top mount seal
- Air line fitting loose
- Air line cracked from age or heat
- Solenoid valve leaking
Diagnostic Steps
- Spray soapy water on air springs and fittings
- Check for bubbles indicating leak location
- Monitor ride height sensors for one corner dropping
- Listen for hissing near air springs
- Inspect air lines for cracking or heat damage
Repair Notes
Replace leaking air spring assembly. Repair or replace air lines as needed.
Related Codes
Other Chassis Codes
- C0021LF Wheel Speed Sensor Range/Performance
- C0022RF Wheel Speed Sensor Range/Performance
- C0023LR Wheel Speed Sensor Range/Performance
- C0024RR Wheel Speed Sensor Range/Performance
- C0025LF Wheel Speed Sensor Circuit Intermittent
- C0026RF Wheel Speed Sensor Circuit Intermittent
- C0027LR Wheel Speed Sensor Circuit Intermittent
- C0028RR Wheel Speed Sensor Circuit Intermittent
- C0035Left Front Wheel Speed Sensor Circuit
- C0036Left Front Wheel Speed Signal Erratic
C0312 on Other Vehicles
Common Questions
What does code C0312 mean on a 2001-2005 BMW 330i E46?
C0312 stands for "Air Suspension Air Spring Leak Detected". The air suspension system has detected an air leak at one or more air spring assemblies.
What are the symptoms of C0312 on a BMW 330i E46?
Common symptoms of C0312 include: Vehicle leaning to one side, Vehicle sitting low after parking overnight, Compressor runs frequently, Suspension warning light.
What causes C0312 on a 2001-2005 BMW 330i E46?
Common causes of C0312 include: Cracked air spring rubber bladder, Leaking air spring top mount seal, Air line fitting loose, Air line cracked from age or heat, Solenoid valve leaking.