Pressure regulation
â–¶ How to fix
Vehicles under warranty:Check pressure limiting valve setting. Renew the air dryer housing if the setting is incorrect. Erase the fault code. Restart the vehicle. Check that the fault code has been erased. Vehicles not under warranty:Check the pressure limiting valve. Adjust the setting as necessary. Erase the fault code. Restart the vehicle. Check that the fault code has been erased.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
Detection
Air pressure in parking brake circuit has been above the permitted level.
Possible cause
Pressure limiting valve for circuit is out of order.