Question about 1999 GMC Suburban

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99 suburban with erratic steering at high speeds. Front end components tight and new. Power steering position sensor was just tested to be ok by dealer. Any other suggestions? Also could sensor still be bad and test fine?

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  • yadayada
    yadayada May 11, 2010

    please explain more?

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Steering position sensor.It's located on steering column under dash.

Posted on Aug 25, 2009

  • Nick7695 Jan 09, 2012

    How do I fix this? I have the same problem.

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Have an alignment done and request that a couple of degrees positive caster be added into adjustment (past specifications) Generally this will either cure or lessen wandering at high speed. Doing this will not harm performance in any way.

Posted on Apr 15, 2009

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2002 suburban 4x4 has very loose steering at high speeds


One thing I can think of is that the steering gearbox adjustment is too far from the pinion and needs to be tighter. But then your mechanic would have known this and reset it. Only other thing could be that you have the incorrect backset in your front wheels and that would make the vehicle squirly at speed. That happened to me when the wheels I stuck on my vehicle were outset too much. Other than that, only other thing is there is no toe in on the front end. Without a certain degree of toe-in, there's no drag at all and the tires will flop from left to right at will.

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My ABS light is on and off on a 2006 Mercury Mariner. Do I need to do something to get this light to stay off


SECTION 206-09: Vehicle Dynamic Systems 2006 Escape/Mariner/Escape Hybrid/Mariner Hybrid Workshop Manual DESCRIPTION AND OPERATION Procedure revision date: 03/29/2005 Anti-Lock Control adobe.gif Printable View (63 KB) The ABS consists of the following components:
  • Hydraulic control unit (HCU)
  • Anti-lock brake control module
  • Front and rear wheel speed sensors
  • Front and rear wheel speed sensor rings
  • Stability control sensor cluster
  • Stability/traction control switch
The ABS prevents wheel lock-up by monitoring the wheel speed sensors and actuating the HCU modulating the brake pressure to prevent wheel lockup. By preventing the wheels from locking up, the driver is able to maintain steering control and stop in the shortest possible distance under most conditions. The traction control system utilizes the same components as the ABS to prevent wheel spin and help maintain vehicle control during acceleration. The roll stability control (RSC) system utilizes the same components as the ABS and the traction control systems and also monitors the steering wheel position sensor and the stability control sensor cluster to assist in stabilizing the vehicle during abrupt maneuvers.
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The ABS module is self monitoring. The module will carry out a preliminary electrical check of the hydraulic pump motor by turning the pump ON for approximately 1/2 second either when the ignition switch is turned to the RUN position and the brake pedal is not pressed or when the vehicle is in motion and at vehicle speeds above 20 km/h (12 mph). The ABS module will also carry out a wheel speed sensor self-test by sending a reference voltage to all of the wheel speed sensors through their circuitry when the ignition switch is turned to the RUN position, with or without brake pedal application. If a malfunction is detected in the pump or wheel speed sensors, the ABS module will shut down and disable the anti-lock system. Normal power assisted braking, however, remains.
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Visual Inspection Chart
Mechanical Electrical

  • Base brake system
  • Brake booster vacuum hose
  • Hydraulic control unit (HCU)
  • Steering components and suspension components
  • Tire size
  • Wheel speed sensor ring
  • ABS module
  • Battery junction box (BJB) fuse(s):
    • 19 (40A)
    • 22 (40A)
  • Brake fluid level switch
  • Brake pressure transducer
  • Smart junction box (SJB) fuse(s):
    • 6 (15A)
    • 34 (5A)
  • Stoplamp switch
  • Wheel speed sensor
  • Wiring, terminals or connectors


You may need to have the dealer run a scan test to determine the DTC fault codes. Then go from there. Autozone can't read these codes as tehy are chassis codes. They only can read powertrain codes.

Good luck. please rate.

Jan 25, 2011 | Mercury Mariner Cars & Trucks

2 Answers

Trouble code P0320 ignition/dist. engine speed input circuit


P0320 - Ignition / distributor engine speed circuit malfunction

The ignition engine speed sensor input signal to Powertrain Control Module (PCM) or Electronic Control Module (ECM) is continuously monitored. The test fails when the signal indicates that 2 successive erratic profile ignition pickup (PIP) pulses occurred.

Symptoms:
- Engine Light ON (or Service Engine Soon Warning Light)
- Lack/Loss of Power
- The engine may be harder to start
- The engine may stumble or stall

When is the code detected?
The P0320 code is triggered when 2 successive erratic PIP pulses are detected.

Possible Causes:
- Loose wires/connectors
- Faulty Crank Position Sensors
- Arcing secondary ignition components (coil, wires and plugs)
- Low battery charge
- Powertrain Control Module

Possible Solutions:
- Resecure loose wire or connectors
- If battery charge is low, recharge or replaced battery
- Replaced crank position sensor
- Replaced starter motor


Test it and tell us news.

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2 Answers

Stabily system diabled - error


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A) corrosion under the sensor causing erratic readings
B) front wheel bearing failing causing erratic readings
C) column sensor failing causing erratic readings


The GM dealer is the only place I know to have THOSE components tested. You can change any of these sensors yourself once you know which one it is. The "service stability" indicator is on because one of the sensors is not giving correct data, and the default mode is to disable the system. 

Good luck and hope this helps, 

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3 Answers

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Everyone always gravitates to the suspension but folks, it's 99% sure that it is the EVO. The EVO is the sensor built into the steering column that senses movement of the steering wheel then controls the power steering pump accordingly. When it goes out (which is all too frequently) you get sloppy and loose steering at lower speeds and it does tighten up a bit on the highway at higher speeds. This is the way it is supposed to work but when it fails it's downright scary trying to keep the truck straight on a narrow two lane road!

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1 Answer

Steering is stiff driving on the road... feels as if it sticking


1.It isn't a lower or upper ball-joint, lower ball-joint, nor tie-rod end. A lower ball-joint being bad, would make the front-end shake. Upper ball-joint, and tie rod ends being bad, would make steering erratic.

Sounds more like the problem is in the steering box. In all actuality, it almost sounds like the power steering pump wasn't changed. Are you sure it's a new, known, good pump?

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The brake discs may be slightly warped.

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The electronic engine controls consist of the following:
  • powertrain control module (PCM) (12A650)
  • throttle position sensor
  • idle air control valve
  • camshaft position sensor
  • crankshaft position sensor
  • mass air flow sensor
  • intake air temperature sensor
  • heated oxygen sensor—front
  • heated oxygen sensor—rear
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  • engine rpm
  • engine coolant temperature
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Steering loose


at the end of the steering wheel there is your steering gear box on the top of the gearbox in the middle you will see a screw and a nut you need a wrench to lossen the nut and a screwdriveer to tighten it up. maybe your front end is loose you should have that checked out

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