C0315moderate severityChassis
Air Suspension Exhaust Solenoid Circuit
on 2023 BMW i7 M70 Dual Motor AWD · AWD
What this code means
Malfunction in the air suspension exhaust valve solenoid that releases air to lower the vehicle.
Symptoms
- Vehicle stuck at raised height
- Cannot lower suspension
- Suspension warning light
- Ride height will not adjust down
Common causes
- Exhaust solenoid failure
- Solenoid wiring open or short
- Valve mechanically stuck
- Control module driver fault
Diagnostic steps
- Test solenoid resistance
- Command solenoid with scan tool
- Check wiring for open or short circuits
- Inspect solenoid valve for debris
- Listen for solenoid click when commanded
Repair notes
Replace exhaust solenoid valve or air suspension valve block.
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