Parking and/or Trailer Air Pressure
â–¶ How to fix
Exchange the air dryer housing. Erase fault memory.
What you'll see
No driver-visible symptom recorded.
System reaction
The system starts pressure limiter mode to dump the pressure down to a reduced level by performing a constant regeneration. After reaching the correct level, normal regeneration and pressure regulation is performed. The regulated system pressure is kept below the maximum.
Diagnostic depth
Detection
The pressure is above the parametrized maximum value.
Possible cause
The pressure limiter for 23 failed.