A-Class Automatic Gearbox ECU Repair

Common Failure symptoms:

• ‘F’ warning message on dash

• Banging into gear

• Sticking in gear

• Failure to select gear

• Limp home mode

• Non-start

Common fault codes:

• P1840 - Valve Y3/7Y1 Pulse Width Modulated Solenoid Valve 1/4 Fault

• 2123 - Y3/7Y5 Pulse Width Modulated Solenoid Valve Shift Pressure Is Defective

• P1858 - 2227 - Starter Contact Defective

• 2531 - Shift Valve 1/4 or 2/5 Jammed In Push Position Shift Valve Pressure Too High.

Affected Vehicles:

• Mercedes A-Class range 1998-2007 (1st and 2nd generation with FTC transmission)