Mercedes A Class (W169) CVT 722.8 transmission ECU Repair

Common Failure symptoms:

• Limp home mode / safe mode

• Loss of power

• ‘Transmission visit workshop’ warning message on dashboard

• Transmission warning light on dashboard

• Not selecting gears

• Sticking in gear

• Output speed sensor fault

• Speed sensor fault

Common fault codes:  

• 0722 - The RPM Sensor From Component Y3/9B5 CVT Output RPM Sensor Is Not Available

• 0793 - The RPM Signal From Component Y3/9B4 CVT Secondary RPM Sensor Is Not Available

• 0717 - The RPM Signal From Component Y3/9B5 (CVT Output RPM Sensor) Is Not Available

• 0730 - The Gear Ratio In The Continuously Variable Automatic Transmission (CVT) Is Not Permissible

• 1634 - Component Y3/9N1 (CVT (Continuously Variable Automatic Transmission) Control Unit) Is Defective Or The Voltage Supply Is Faulty

Affected Vehicles:  

• Mercedes A-Class A150 / A160 / A170 / A180 / A200

• Mercedes B-Class B150 / B160 / B170 / B180 / B200