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I need to know how to troubleshoot and repair/replace the magnasteering sensor power steering assist and where it is located on the car

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What is wrong with this 2007 pontiac g/p no p/s at low rpms?


The power steering pump has nothing to do with it .
Variable Effort Steering System Description and Operation
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 (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 setting a DTC.
Your best bet is take your vehicle to a GM dealer or a ASE certified repair shop that knows about this system .

Mar 14, 2016 | 2007 Pontiac Grand Prix

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Hi my eps light is comming on and i lose power streering how do i fix it


It cannot be fixed until the problem with the Electronic Power Steering(EPS) is properly diagnosed.
The power assist system is comprised of...
  • EPS computer unit
  • Warning light on the dashboard
  • A connection to the OBD2 Diagnostic port in the car
  • A Vehicle speed sensor
  • A sensor which detects steering rotation on the input shaft of the steering rack
  • An electric motor, which provides the power steering assistance to the steering rack. Unless that motor runs you will have no power assistance to your steering.
  1. You will need to have the system scanned with the appropriate scan tool through the OBD port in the car. This will generate various fault codes which assist in diagnosing where the problem lies in the power steering system. It may be just a failed sensor that needs replacing or it might be a bigger problem.
  2. Once the fault codes have been pulled the mechanics can diagnose the cause and make whatever repairs or parts changes may be required.
  3. This is not a do it yourself exercise. You will need a mechanic who knows these Japanese electronic power steering systems and who understands the fault codes (and there are many of them on this EPS system) to diagnose the problem for you and fix whatever fault(s) has arisen.

Dec 30, 2015 | Daihatsu Cars & Trucks

1 Answer

Were is the steering pump sensor on pontiac grand prix gt 2005


This is a very complex system an if you don't work on these systems all the time , I suggest you take it to a ASE certified repair shop that does !
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 (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 setting a DTC - diagnostic trouble code !

Sep 29, 2015 | Pontiac Grand Prix Cars & Trucks

2 Answers

My son replaced the power steering pump. My transmission will not shift out of second gear. No problem before and now odemeter doesn't work


Look right below the power steering pump and there should be 2 wires going to a sensor on the transmission-transaxle. this is the speed sensor and it is located where the right side axle goes into the transaxle. he might have accidentally disconnected it or possibly broken the wires. after repairing this you will need to reset the check engine light and that will clear any transmission codes. Good luck! Scott.
I will keep an eye out for you if you need more assistance.

Aug 22, 2011 | 1999 Pontiac Grand Prix

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Mechanic says we need to replace our speed sensor on our 1999 Jeep Grand Cherokee limited v6 4.0L. Cheap part. Mechanic wants to charge $295. How hard is it to replace?


Not $295 hard. Its mounted on the side of the output shaft on the transmission. It has one plug on it. probably a 30 minute job. Please rate answer!! Thank you

Sep 14, 2010 | Jeep Grand Cherokee Cars & Trucks

2 Answers

2006 chevy hhr power steering its hard to turn? Can u tell me where to find the 60 amp fuse location under the hood fuse box?


THIS IS A DEALERSHIP FIX ELECTRIC POWER STEERING IS CONTROLLED BY POWER STEERING CONTROL MODULE.IT CONTROL BY INFORMATION SENSORS LIKE TORQUE SENSORS IN STEERING WHEELAND VECHICLE SPEED SENSOR IN WHICH SPEED WILL AID IN STEERING.YOU GO 10 MILES AN HOUR YOU WILL RECEIVE FULL POWER ASSIST.YOU GO 25 MILE HOUR POWER ASSIST REDUCED.THIS STEERING SYSTEM HAS TO BE HOOKED UP ON DIAGNOSTIC EQUIPMENT AT DEALERSHIP YOU CANT FIX AT HOME.YOUR OWNERS MANUAL IN GLOVE BOX HAS ALL FUSE AND RELAYS LOCATIONS.

Jun 19, 2010 | 2006 Chevrolet HHR

1 Answer

Cadillac deville 1998 power steering /magnasteer makes noise turning


  • Check the steering fluid maybe you need to add some and also check the hose make sure there are no leaks and if the noise still there after you add a steering fluid visit a mechanic and check the hydraulic of the steering wheel.

Feb 12, 2010 | 1998 Cadillac DeVille

1 Answer

Power steering makes noise and vibrates when turning . Is this a pump problem or something to do with magnasteer ?


  • Check the Steering fluid first. and check the hose of the steering fluid make sure there is no leak. And after you add a steering fluid and still there is a noise visit a good mechanic and advise the mechanic to check the pump.

Feb 12, 2010 | 1998 Cadillac DeVille

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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