Toyota 4Runner Steering Wheel Hard to Turn: Common Causes

If your Toyota 4Runner’s steering wheel is hard to turn, it’s almost always going to be caused by an issue with the power steering system.  But there can be other causes as well.

Your vehicle’s power steering system is responsible for taking energy from the engine, converting it to hydraulic pressure, and using that pressure to decrease the amount of force that you need to apply to the steering wheel.

The first thing you should do is check your 4Runner’s power steering fluid level.

Toyota 4Runner Steering Wheel Hard to Turn

CauseNotes
Low Power Steering FluidThere’ll be a whining noise that changes when you move the steering wheel.
Power Steering PumpThere will be a noise similar to low power steering fluid, but the reservoir will be full.
Loose Or Broken Serpentine BeltThere will likely be a squealing or chirping noise unless the belt is missing.
Rack and PinionMay lessen or go away as your 4Runner warms up.
Bad Power Steering FluidMay appear dark or black. Noise free.
Low tire pressureTire pressure light may be on. Check the pressure.

Here are six of the most common reasons why your 4Runner’s steering wheel may be hard to turn

Table of Contents

  1. Power Steering Fluid Low
  2. Pump Failure
  3. Serpentine Belt
  4. Rack and Pinion
  5. Bad Fluid
  6. Low Tire Pressure

1.  Power Steering Fluid Low

The place to start looking for what is making your Toyota 4Runner’s steering wheel hard to turn is the power steering fluid.  If enough of it has leaked out, your vehicle will no longer have enough to properly function.  

This is the most common reason that the power steering stops working.  Putting fluid back in may solve the problem for a bit, but if has leaked, it will leak out again. 

Finding the cause of the leak is the only way to stop periodically filling it.  Check the hoses around the pump.  That’s where they most often leak.

You should have been hearing an almost grumble like sound as you moved the wheel if this were the case.  It won’t grumble or wine if ALL the fluid is out though.  Here’s more on sounds you could hear under the hood.


2.  Power Steering Pump Failure

Toyota 4Runner hard to turn causes

Before power steering, it would take many turns of the steering wheel to move the wheels.  Many turns made it easier for the driver to move the wheels (by leveraging mechanical advantage), but it was still much harder than driving a non power assisted vehicle.  

Since now you only get a few turns of the wheel, it can be almost impossible to drive a modern vehicle without power steering.

The power steering pump itself can go bad.  If it is no longer pumping fluid to your 4Runner’s rack, it can’t pressurize the power steering lines and there will be no steering assistance.


3.  Loose or Bad Serpentine Belt

You can check the belt that turns the power steering pump.  Does it look worn or damaged to you?  Is it shiny and glazed?  

With the engine off, pinch it lightly and try and move your fingers.  If doesn’t grip them at all, that could be a sign of a bad belt. 


4.  Bad Steering Rack

The rack is what takes the pressure from the power steering system and actually applies it to your Toyota 4Runner’s wheels.  

If it is the rack that is causing the problem, it’s typically going to manifest itself more when the vehicle is cold.  As it warms up the problem will go away (at first).  Eventually, it never goes away.


5.  Bad Fluid

It is possible that the power steering fluid has gotten so thick over time that it is no longer properly doing its job as a hydraulic fluid.  If this is the case, you’ll need to flush your 4Runner’s power steering fluid.


6. Low Tire Pressure

Low tire pressure can cause your Toyota to be more difficult to turn than normal.  As the tire pressure decreases, the sidewalls and you’ll get a stiff steering wheel.

Your 4Runner’s tire pressure light won’t come on until about 25% of the air pressure is missing.  By the time the light comes on, the wheel will be harder to turn. Low tire pressure can also cause your Toyota 4Runner to get bad gas mileage.

If you’re having a hard time steering your 4Runner, it is a safety issue.  We recommend bringing it in for service right away. 

If it was out of fluid, make sure to keep an eye on the fluid level.  You don’t want to run out again and burn up the pump.