Question about 1995 Cadillac Seville

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Speed sensitive steering loose at higher speeds

All steering parts are tight,it seems to be in the rack and pressure control of the system.another problem is after removing and replacing the abs and traction control fuse it still shows fault codes.i tried to reset pcm by disconnecting the battery with no luck.any ideas?

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Check the rear upper control arm bushings. Try to move the rear wheels in and out at the top with the car sitting on the ground. This is real common.

Posted on Mar 16, 2009

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My 2006 Buick Lacrosse suddenly started pulling to the right and became very hard to steer. Then the "Charging System Failure" warning came on. What could this be?


Do you know if your vehicle has --------------------------------------------------------------------------------
Power Steering System (w/o Electro-Hydraulic Steering) or
Variable Effort Steering System
The variable effort steering (VES) system or MAGNASTEER® varies the amount of effort required to steer the vehicle as vehicle speed changes. At low speeds, the system provides minimal steering effort for easy turning and parking maneuvers. Steering effort is increased at higher speeds to provide firmer steering for increased road feel and directional stability. The electronic brake control module (EBCM) controls a bi-directional magnetic rotary actuator located in the steering rack and pinion. The EBCM varies the steering assist by adjusting the current flow through the actuator to achieve a given level of effort to steer the vehicle. The VES system accomplishes this by adding or subtracting torque on the input shaft to the rack and pinion. The main component of the system is an electromagnetic actuator, which consists of a multiple-pole ring-style permanent magnet, a pole piece, and an electromagnetic coil assembly. The VES system uses the ABS wheel speed sensor inputs to determine vehicle speed. When the EBCM senses wheel speed, it commands a current to the VES actuator that is most appropriate for each speed. The EBCM commands current from negative two amps to positive three amps to the actuator, which is polarized. At low speeds, a negative current is commanded, which assists steering. At medium speeds no current is commanded and steering is assisted by hydraulics only. At high speeds, a positive current is commanded, which creates steering resistance. Ignition voltage and ground are provided through the EBCM. The EBCM has the ability to detect malfunctions in the actuator or the circuits to the actuator. Any malfunctions detected will cause the system to ramp to zero amps and steering will be assisted by hydraulics only and set a DTC.
Are there any other lights lit on the dash ? ABS ?
DTC C0450 Steering Assist Control Solenoid/Motor/Actuator Circuit could have a diagnostic trouble code !
The electronic brake control module (EBCM) commands current from 0-1 amp to the variable effort steering (VES) actuator, depending on vehicle speed. At low speeds, 1 amp of current is commanded to the actuator and the actuator valve is fully closed. A speed increases, less current is commanded to the actuator and the valve opens, allowing pressure to bleed off through a power steering fluid orifice. The EBCM monitors and compares the Commanded and Feedback Current parameters to detect malfunctions in the VES system.
Or you could have a bad steering rack !
Charging System/Generator Fault
Refer to Charging System Description and Operation in Engine Electrical
Alternator problem maybe !
The electrical power management (EPM) system is designed to monitor and control the charging system and send diagnostic messages to alert the driver of possible problems with the battery and generator. This EPM system primarily utilizes existing on-board computer capability to maximize the effectiveness of the generator, to manage the load, improve battery state-of-charge (SOC) and life, and minimize the system's impact on fuel economy. The EPM system performs 3 basic functions:
• It monitors the battery voltage and estimates the battery condition.
• It takes corrective actions by adjusting the regulated voltage.
• It performs diagnostics and driver notification.

Nov 27, 2016 | Buick Cars & Trucks

2 Answers

I just put hub bearings on my 2005 grand Prix GTP and when I plug the sensor it says service variable effort steering what's wrong.


check the sensor on top of the steering rack ,their is a sensor that increases the idle when the steering is turned when the vehicle is stationary

Nov 10, 2016 | Cars & Trucks

1 Answer

Hi, My Versa wanders at speeds over 70mph. Probably electric steering. How can I make it more stabile on the highway? The car did it since new. It has been checked for everything that could go wrong.


have an inspection done on the steering and front end suspension
loose /worn ball joints steering end joints , wheel alignment and faulty tyres will give you this indication
The power steering pump does nothing more that provide pressure into the steering box/rack to assist with the steering
it may be that the steering is to sensitive at speed and most systems compensate by having less power assist at speed
take it to a steering specialist accredited shop as the control valves may need replacing or adjusting

Aug 01, 2015 | Cars & Trucks

1 Answer

Lumina troubleshooting


first check the condition and level of p/s fluid. if low top off first and turn your steering wheel left to right and back several times to try to bleed air out of p/s system. if p/s is still stiff or hard your p/s pump pressure output can be measured with a pressure gauge. if pressure is below specs its time to replace it. if your p/s output pressure is good then you would need to inspect your p/s hose or lines for kinks or restrictions to your steering rack. on certain model vehicles p/s sensitivity can be adjusted on the steering rack. you would need to check the vehicles service manual to see if its possible to adjust steering rack sensitivity.

Aug 29, 2014 | Chevrolet Lumina Cars & Trucks

2 Answers

Okay so if i have fixed my power steering pump have had the rack and minion looked at what else would make my power steering not work on a dodge intrepid


Some Chryslers had a variable assist PS solenoid on the rack and pinion. It lowers PS fluid pressure during higher speed driving-highway driving, but allows full PS pressure during low speed driving. It would be located on the top of the rack, towards the drivers side, and would have an electrical connection to it. If you have this feature (variable assist power steering), have a shop diagnose it. I don't know the testing procedure.
The power steering belt is tight and not slipping?

Jul 02, 2014 | Dodge Intrepid Cars & Trucks

1 Answer

I have a 2000 gmc 2500 I recently replaced my power steering pump and have trouble turning at low speeds I replaced my steering geat today and still have the problem


See if you have "variable assist power steering" with a malfunction. A solenoid may be mounted on the steering rack, provides less PS at higher speeds, full power steering capability at slow speeds or when stopped. Your belt is tight for the pump?

Aug 31, 2013 | GMC Cars & Trucks

1 Answer

The steering in my 98 Buick Century is hard to turn at low speeds. Is this a steering pump issue or the rack and pinion?


Your PS pump is fine.

This vehicle has:

Variable-assist power steering: A power steering system that uses valves and speed sensors to vary the amount of steering assist according to engine or road speed. At slow speeds more steering assist is delivered and steering the wheels is easier; necessary for parking, etc.. At higher speeds, steering assist is reduced and more steering effort is required to steer the car, giving the driver greater feel of the road. Also known as Speed-sensitive power steering.

Loss of current to the magnetic coils would cause a loss of power assist at low speed. Coil resistance can be checked with an ohmmeter, and should read about two ohms. An infinite (open) reading indicates a bad coil (requires replacing the rack since the coils are not serviceable). Checking for shorts between both sides of the coil assembly and rack housing is also recommended.

Best wishes

Jan 01, 2011 | 1998 Buick Century

2 Answers

I have a 2003 chevy blazerthat has power steering problem no leak


There is a "pressure regulator" located in the pump just behind the high pressure line that directs high pressure fluid to the steering rack when you turn the steering wheel. It sounds like the regulator valve is sticking and not sending the high pressure fluid to the steering rack when you turn the wheel.
You can remove the pump and clean the valve, reinstall the pump and flush the steering system with fresh fluid or replace the pump and flush the system with new fluid.
Good luck.

Oct 23, 2009 | 1996 Chevrolet Blazer

2 Answers

Power steering failure


Problems with electronic variable-assist systems include all of the same things that can go wrong with a conventional power steering system (leaks, center wear in the steering gears, pump & hose failures, etc.), plus problems with the control electronics including the vehicle speed sensor circuit, the solenoid valve and control module. Accurate diagnosis, therefore, is essential to minimize warranty returns. Most of these systems provide diagnostic fault codes that can be accessed with a voltmeter, test light or scan tool to pinpoint the nature of the fault (if the fault is electronic rather than mechanical or hydraulic).

If power to the solenoid or control valve actuator is lost, the valve keeps the bypass circuit closed so full power assist is provided under all driving conditions. The only indication of trouble, therefore, might be a loss of road feel and/or increased steering sensitivity at highway speeds.

It’s important to remember that variable-rate power steering only reduces the amount of pressure that reaches the steering gear at higher road speeds. The only way it could reduce power assist at low speed would be in the unlikely event the actuator or solenoid valve failed in the open position. This could cause a noticeable reduction or loss of power assist.

On GM’s Magnasteer racks, loss of current to the magnetic coils would cause a loss of power assist at low speed. Coil resistance can be checked with an ohmmeter, and should read about two ohms. An infinite (open) reading indicates a bad coil (requires replacing the rack since the coils are not serviceable). Checking for shorts between both sides of the coil assembly and rack housing is also recommended.

The system does have self-diagnostic capability, but there is only one fault code: C1241 (Magnasteer circuit malfunction). The code is set if the module detects an open or a short in the coil circuit. If this code is present, the Magnasteer system is disabled and will not vary the steering effort as vehicle speed changes. The C1241 body code can be read with a Tech 2 or equivalent scan tool. The Tech 2 tool can also be used to perform a Magnasteer function test. The test varies the current to the coil so you can check for a change in steering effort when turning the steering wheel.

Replacement racks for variable-assist power steering applications are available with or without an EVO control solenoid. As long as the original EVO control solenoid is working OK, it can be removed and installed on the replacement rack to save your customer a few bucks. There’s no need to replace the whole rack if only the EVO solenoid valve is defective.

On GM Magnasteer applications, the whole rack must be replaced if the rack or control unit is defective because the Magnasteer unit is part of the rack. Handle with care because the permanent magnets inside the Magnasteer valve assembly and connector are fragile and can be easily damaged.

Good luck and hope this helps you understand the Steering system on your STS to save you some money on what to look for and what to look out for if your going to have a auto shop repair it. Such as the Valve is replaceable and it may just be a bad wire connection.



May 22, 2009 | 2002 Cadillac Sts

1 Answer

Loss of power steering


If memory serves me correctly... the 05 deville is equipped with "Magnasteer" the electical connector at the rack and pinion is not a pressure sensor unless its on the line itself. The system operates by inducing voltage to magnets in the rack to make turning easier at lw speeds while adding resistance at higher speeds for added control and less drift. Check for any codes on your climate control by pushing "off and warmer" at the same time with the engine off, key on. Google the codes and see if any relate to the steering system and repost! I hope that helps!

Mar 09, 2009 | 2005 Cadillac Deville

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