Servotronic steering gear, servicing

WARNING: This page does not describe the selected car, but rather 17 other vehicles, including the 2009 Audi S4, 2009 Audi A4, 2008 Audi S4, 2008 Audi RS 4, and 2008 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

On vehicles with Servotronic steering gear, power steering is controlled electronically and is dependent on vehicle speed.
If electronics malfunction, steering works like the normal power steering.
Servotronic Control Module J236 does not have On Board Diagnostic (OBD) capabilities.

Fault table

Possible fault	Possible cause of fault	Corrective action
When maneuvering the vehicle, stronger steering force is needed than usual. Steering is unusually easy at higher speeds.	Voltage supply interrupted Speed signal interrupted Servotronic Solenoid Valve faulty	Check voltage supply → Servotronic voltage supply, checking Check speed signal → Speed signal, checking Check Servotronic Solenoid Valve → Servotronic Solenoid Valve , checking
Power steering difficult to move on one side of vehicle, e.g.: steering to left is easy and to right is difficult	Hydraulic faulty in power steering gear	Replace power steering gear Left-hand drive vehicles: → Power steering gear, removing and installing

Possible fault

Possible cause of fault

Corrective action

When maneuvering the vehicle, stronger steering force is needed than usual.
Steering is unusually easy at higher speeds.

Voltage supply interrupted
Speed signal interrupted

Servotronic Solenoid Valve faulty

Check voltage supply → Servotronic voltage supply, checking
Check speed signal → Speed signal, checking

Check Servotronic Solenoid Valve → Servotronic Solenoid Valve , checking

Power steering difficult to move on one side of vehicle, e.g.: steering to left is easy and to right is difficult

Hydraulic faulty in power steering gear

Replace power steering gear

Left-hand drive vehicles: → Power steering gear, removing and installing