GMS auxiliary brake manager vehicle speed control state error. GMS configuration fault.
â–¶ How to fix
• Spare part program the COO unit. • Spare part program the GMS unit. • Check the GMS for DTCs • Check the GMS spare part number. Replace the GMS unit with a unit with correct spare part number.
What you'll see
No driver-visible symptom recorded.
System reaction
Downhill Speed Control function cannot be activated.
Diagnostic depth
Detection
The Auxiliary Brake Manager (GMS) does not accept Vehicle Speed Request.
Possible cause
• COO configuration fault. • GMS configuration fault. • A GMS unit with a software not compatible with the vehicle, has been installed, e.g. a spare part GMS has been installed, which has wrong software version.