Skip the auto shop - Our mechanics make house calls

Q: Power steering loss

asked by on

My car loses its power steering when driving at very low speed. It happens when I'm parking or doing a U turn from a standing still. The steering is fine during normal driving. It doesn't have any fluid leaks, and I have replaced the power steering pump and the O ring seal for the fluid reservoir. I've bled the system a few times. Do you know why this is happening and what I can do to fix it? Thanks.

Hi there, thanks for writing in about your 2001 Mercedes Benz ML430. This problem could be caused by a slipping belt or a faulty belt tensioner. The power steering pulley needs to be observed while the car is parked and in idle to see if its operation is notchy and not smooth. Notchy operation would mean the belt is slipping either from age or lack of sufficient tension produced by the tensioner. You may want to enlist the help of a mechanic, such as one from YourMechanic, who will have the tools and expertise to diagnose and repair the power steering issue so that the correct repairs and adjustments are made.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: How do you replace steering angle sensor on a 2013 Fiat 500e?

Hello, thank you for writing in. Often the Steering Angle Sensor can be re-calibrated when it has lost connection. A manufacture qualified technician can perform this programming for you, unless you have access to a quality OBD-II scan tool. If...

Q: Front seal leak in minivan's transmission - 1997 Ford Aerostar

Hello. It sounds like your transmission either did not get completely full of fluid after the service or it is leaking fluid again. To check the transmission fluid, start the car and leave it in park. Next pull out...

Q: Humming sound

It could be a failing wheel bearing, while traveling at say 40 MPH momentarily swerve to the left to unload the left (vehicle weight is moved onto right wheels, of course), and swerve back to the right to load the...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.