C0312moderate severityChassis
Air Suspension Air Spring Leak Detected
on 2012 Chevrolet Express 4.3L V6 Vortec · RWD
What this code means
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.
Other Chassis codes on this vehicle
C0021
LF Wheel Speed Sensor Range/Performance
C0022
RF Wheel Speed Sensor Range/Performance
C0023
LR Wheel Speed Sensor Range/Performance
C0024
RR Wheel Speed Sensor Range/Performance
C0025
LF Wheel Speed Sensor Circuit Intermittent
C0026
RF Wheel Speed Sensor Circuit Intermittent
C0027
LR Wheel Speed Sensor Circuit Intermittent
C0028
RR Wheel Speed Sensor Circuit Intermittent
C0035
Left Front Wheel Speed Sensor Circuit
C0036
Left Front Wheel Speed Signal Erratic