Question about 2004 Pontiac Grand Prix

3 Answers

My "service variable effort steering" light came on awhile back and I took it to my mechanic. They said the issue was my rack and pinion, so I had them replace that. $1200 later and my light is still coming on. I took it to the dealership where I originally purchased it from and at first, they told me it was the same problem. After telling them that I had all that replaced already, they changed their tune and said it was my EBCM, which was a $985 job. Can someone please help me find the correct issue??

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  • stephzaremsk Sep 15, 2010

    I just got off the phone with the dealership and they said the code that came up was C0450- Internal Short to Ground. I have no idea what that means.

  • stephzaremsk Sep 15, 2010

    Since taking the vehicle to the mechanic, having my tires changed, and taking it to the dealership, my Check Tire Pressure Light is on and my cruise control isn't working either. Are all of these issues related??

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3 Answers

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  • Pontiac Master
  • 19,396 Answers

Hi.

The diagnosis of this kind of problem is made reading codes with a Tech 2 GM Diagnostic Scan Tool. If they did code reading the first time, even before doing the job at a generic garage, then you would not have wasted money in wrong part and time.

If they said that EBCM must be replaced, then code returned was U1040, which means: Loss of Communications with EBCM

Before replacing the the electronic brake control module (EBCM), check connector and wiring to module. Ask the dealer if they did code reading, and ask if the EBCM replacement choice was determined by codes.

Regards.

Posted on Sep 15, 2010

  • Ginko
    Ginko Sep 15, 2010

    Hi.

    C0450 is not internal short to ground. See here.

    C0450 is the general DTC for Steering Assist Control Actuator Circuit Malfunction :

    Here service details:VES system uses the
    electronic brake control module (EBCM) to control current to a
    bi-directional electromagnetic rotary actuator. The VES system also uses
    the ABS wheel speed sensor inputs to determine vehicle speed. The EBCM
    commands current from negative 2 amps to positive 3 amps to the VES
    actuator. 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.

    Faults that can cause the code are: wiring problems,steering ,or Electronic brake control module.(EBCM)

    If problem is EBCM there should be a comm error U1040.

    If there is no U (communication code), tell them to do TECH 2 EBCM "Clear All DTC's" command. If not already performed.

    Source: PIT4665A (#PIT4665A:)

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  • 1 Answer

Were i the sensor under the pump ,i have the send problem,i am salvador.

Posted on Sep 29, 2015

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  • Master
  • 10,515 Answers

Hi,

I have no idea what they are trying to replace. This is a common problem on this model.

The problem is likely the pump but there is a sensor that adjusts the pressure that the pump supplies to the steering gear and that could also be the problem. The use of a Tech II scan tool should be able to tell if the pump is putting out pressure and if it is not the pump is bad. The Tech II is a tool that most any dealer would have and some independent garages may also. These have a high failure fate of the pump shaft and if you remove the belt and pull the pulley on the power steering it may pull right out if it does the pump needs to be replaced.

If the power steering pressure sensor does not detect pressure it would likely to that light on, or the problem could also be the sensor itself (this is not a common problem).

Let me know,if needed further assistance.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Posted on Sep 16, 2010

  • Ginko
    Ginko Sep 26, 2010

    Thanks for the nice feedback.

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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

2 Answers

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

1 Answer

2002 cadillac dts,when turning right at low speeds turns extremely hard,only right


You need to get the front suspension checked as a precaution, to rule out damage. You should also check if you have any vehicle error codes (DTC\'s) set. You do not need a scan tool to do this - simultaneously hold in the top of the Info button and the On/Off button for a few seconds and your instrument panel will go into diagnostic mode. Be prepared with paper and pencil - you will likely have a bunch of them which you can then look up on the internet.



Mechanically, the most probable cause is a failing steering rack and pinion assembly, due to excessive wear on the rack bushings. This wear is usually caused by the protective rubber boots on the control rods failing (letting road crap get onto the exposed rods), or bad power steering fluid. Older Cadillacs are prone to this type of damage. Another possible cause is a failure of the variable effort steering actuator (part of the rack).

Sep 25, 2014 | 2002 Cadillac DeVille DTS

1 Answer

Power steering hose keeps breaking, even when replaced by high pressure hoses. Replacing rack and pinion does not help either.


A bad seal in the rack and pinion would have caused low pressure from fluid by-passing the seal. This also would have caused noticeably increased effort to steer the vehicle. Excessively high pressure would indicate an issue between the power steering pump and the rack, and since the hoses have been replaced I would focus on the pump. PS, find a real mechanic, not a parts changer.

Apr 06, 2014 | 2001 Chrysler Town & Country

1 Answer

2007 Pontiac Grand prix GT steering components diagram


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.

The Magnasteer® system is a speed-dependent power steering system. The Magnasteer® system provides power assist at varying levels depending on need.
A bi-directional magnetic rotary actuator in the steering gear adjusts the amount of torque (driver effort) necessary to turn the steering wheel.
The Magnasteer® is controlled through the ABS module and varies the torque by adjusting the current flow through the actuator.
The amount of adjustment will be directly related to the vehicle speed. The controller receives speed-related input signals from the vehicle speed sensor.
For more information on Magnasteer® refer to Variable Effort Steering System Description and Operation

Is the vehicle driveable ? The steering wheel is connected to the wheels

DTC C0450 Steering Assist Control Solenoid/Motor/Actuator Circuit
Sounds like it's stuck on full assist .

Apr 25, 2017 | Cars & Trucks

1 Answer

Variable effort steering service light came on how do i sevice it


In this case,the problem can be faulty steering sensor or issue with steering pump.Also the possibility is faulty steering rack and pinion gear.In some cases the problem noticed was faulty fuse.
To confirm what exactly is causing this problem.I recommend you to click the help link below and troubleshoot the problem :-----steering service light came on 2004 Pontiac Grand Prix?http://technoanswers.blogspot.in/2012/02/on-one-my-pontiac-grand-prix-relatred.html
-----------Steering service light ON ? http://technoanswers.blogspot.in/2012/02/steering-service-light-on-gmc-sierra.html
--------This links will help.Thanks.

Feb 15, 2012 | 2004 Pontiac Grand Prix

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

Power steering effort


check the pwer steering belt to make sure its not loose...check fluid levels...and lastly it might be the rack and pinion starting to go bad

Mar 09, 2010 | 1994 Lexus Es 300

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