Weak Power Steering Pump?
Thread Starter
10th Gear
Joined: Jul 2019
Posts: 12
Likes: 11
From: Pa
Weak Power Steering Pump?
So, while moving my wife’s 2015 Gx 460, I noticed the rpm’s increased when I turned the steering wheel while I was stationary in park. I can honestly say that I have never noticed this before. Is this normal??
A quick google search says weak PS pump, but I don’t see many replacement threads on this forum. Please tell me this is normal & not another expensive trip to the stealership.
A quick google search says weak PS pump, but I don’t see many replacement threads on this forum. Please tell me this is normal & not another expensive trip to the stealership.
Advanced
Joined: Aug 2012
Posts: 507
Likes: 166
From: Santo Domingo
it’s actually normal in my book and is a feature of almost every hydraulic power steering system, especially on big V8s.
What’s happening is the ps pressure switch when you turn the wheel while stationary, the power steering pump has to work much harder to move those heavy tires against the pavement. This creates a huge load on the engine that could actually cause the RPMs to dip or the engine to stall at idle.
To prevent that, the ecu detects that spike in steering pressure and intentionally bumps the idle up by 100 or 200 RPM to compensate for the extra work the pump is doing. You’ve probably just never noticed it before because you weren't looking for it, but every GX 460 on the road does this, mine does.
A weak pump usually groans, whines like a blender, or makes the steering feel heavy when you're parallel parking. If your steering feels smooth and isn't making a loud sound, your pump is likely perfectly fine.
What’s happening is the ps pressure switch when you turn the wheel while stationary, the power steering pump has to work much harder to move those heavy tires against the pavement. This creates a huge load on the engine that could actually cause the RPMs to dip or the engine to stall at idle.
To prevent that, the ecu detects that spike in steering pressure and intentionally bumps the idle up by 100 or 200 RPM to compensate for the extra work the pump is doing. You’ve probably just never noticed it before because you weren't looking for it, but every GX 460 on the road does this, mine does.
A weak pump usually groans, whines like a blender, or makes the steering feel heavy when you're parallel parking. If your steering feels smooth and isn't making a loud sound, your pump is likely perfectly fine.
Thread Starter
10th Gear
Joined: Jul 2019
Posts: 12
Likes: 11
From: Pa
it’s actually normal in my book and is a feature of almost every hydraulic power steering system, especially on big V8s.
What’s happening is the ps pressure switch when you turn the wheel while stationary, the power steering pump has to work much harder to move those heavy tires against the pavement. This creates a huge load on the engine that could actually cause the RPMs to dip or the engine to stall at idle.
To prevent that, the ecu detects that spike in steering pressure and intentionally bumps the idle up by 100 or 200 RPM to compensate for the extra work the pump is doing. You’ve probably just never noticed it before because you weren't looking for it, but every GX 460 on the road does this, mine does.
A weak pump usually groans, whines like a blender, or makes the steering feel heavy when you're parallel parking. If your steering feels smooth and isn't making a loud sound, your pump is likely perfectly fine.
What’s happening is the ps pressure switch when you turn the wheel while stationary, the power steering pump has to work much harder to move those heavy tires against the pavement. This creates a huge load on the engine that could actually cause the RPMs to dip or the engine to stall at idle.
To prevent that, the ecu detects that spike in steering pressure and intentionally bumps the idle up by 100 or 200 RPM to compensate for the extra work the pump is doing. You’ve probably just never noticed it before because you weren't looking for it, but every GX 460 on the road does this, mine does.
A weak pump usually groans, whines like a blender, or makes the steering feel heavy when you're parallel parking. If your steering feels smooth and isn't making a loud sound, your pump is likely perfectly fine.
Pole Position
Joined: Jan 2019
Posts: 2,633
Likes: 1,393
From: WA
... the moral of the story ... always (when possible) turn the wheel only when the car is moving ... even a minor amount of tire rotation massively reduces the forces on the steering components required to turn the tires, especially on dry pavement. Never ever had the need to do an alignment (GX470, GX460, 4-Runners, FJ Cruiser, Sequoia) ... other than after a minor lift.
Last edited by ASE; Mar 1, 2026 at 06:14 PM.
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