Question about 2006 Pontiac Grand Prix

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Shimmy in wheel when braking lightly

Shimmy in wheel when braking abs light is on run diagnostics check says hub assembly tried that was not then tried new rotors still no any ideas?

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Check what sensor type is fitted - i.e. can run off hub magnet ring, or may be older type peak/trough driveshaft ring that runs next to wheel abs sensor. If you've changed the hub parts then the sensor or sensor wiring is the best place to start with. You may need use of a diagnostic tool to check the wheel sensor works when spinning the wheel.

Posted on May 08, 2010

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My ABS light comes on and goes off in my 2005 mariner. I sometimes notice a grinding sound and can feel the brake pedal shake when turning left or right. Only when the light is on.


check the hub/wheel bearing and your brakes the abs is part of your hub assembly and if hub damaged or failing will affect the abs system --also check the sensor and wiring sometimes debris damage the wire but with grinding and shake most probable is hub and a brake job

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My abs and brake light stay on while am driving


The computer has detected a condition that indicates a fault with the ABS/Traction system. Typically that's caused by a wheel sensor problem, but it can also be caused by a faulty connector, peripheral device or the computer.
The above is the shop or garage answear. How about telling us how to fix the problem , besides replacing the computer or wheel sensor? How do we check these things?
Sometimes can be as simple as a short circuit in the rear break lights or a faulty connection in the break lights.
You can start checking the break light system. Then the sensors and finally the computer.

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My services traction light comes on on my 05 chevy impala and my abs light doesnt go off neither does my trac light. What could be the problem? and how much would u think i looking at in cost to fix it?


Very common problem. The MOST LIKELY cause is that you have a front wheel speed sensor that is not working properly. This could be due to a bad front wheel bearing assembly or it could be a wiring problem. GM has had a LOT of problems with the wiring harnesses. A company named "DORMAN" makes a harness repair kit. (See picture below) The Dorman part number is: Part Number: 970-041 The wheel speed sensor itself and the wheel bearing come as a complete "HUB" assembly. The wheel bearing should be checked for looseness and the speed sensor should be tested at the speed sensor connector for AC voltage output when the wheel is spinning. If the bearing or the sensor is bad, then you must replace the hub assembly. If this is the case, I recommend using the "Timken" hub assemblies. They are more expensive, but are much better quality. I have had many problems using the cheaper brands. (See picture below) If the wheel bearing and sensor is OK, then the harness should be replaced. You will have to scan your Antilock Brake System (ABS) module to find out which one is causing the light to come on. As far as cost...it depends on exacltly WHAT it needs and WHO is doing the job. There also may be more than one speed sensor giving you problems. Your best bet is to get it diagnosed and get an estimate of repairs. If they try to sell you a hub assembly, ASK them if they actually TESTED the speed sensor. MOST mechanics out there will just throw a speed sensor (hub assembly) at the problem if they have a speed sensor code, only to find out later that the problem is in the harness. Of course, the customer is the one who ends up paying for their incompetence when this happens. dttech_36.jpg
SPEED SENSOR WIRING HARNESS REPAIR KIT


dttech_37.jpg WHEEL BEARING, SPEED SENSOR AND HUB ASSEMBLY

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My 2002 Lincoln LS v6 Lost Engine Power,Traction Control Light was flashing & ABS light Came on! ANY IDEA?


Had the same problem with my 2002 Lincoln LS, it was a bad wheel speed sensor. The right front wheel bearing had some play in it, so I had the hub assembly replaced. The hub assembly comes with a new wheel speed sensor attached. After I replaced the hub assmbly with sensor, the ABS and Traction Control lights went off. No problem since!

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Front passenger brake is pulsing and there is no abs light on in my 1997 pontiac grand prix.I believe it might be abs sensor but don't know where to find it in wheel assembly.


A front brake pulsing with no ABS light is a rotor that is no longer true i.e warped. Pull off the tire and rotate the rotor. Hold a straight edge (ruler) across the outside of the rotor as your rotating the rotor. You will note that it changes distance on the straight edge / ruler as it rotates. (in out wobble) A good way to test for an out of true rotor is to drive at about 45 miles and hour and really stand on the brakes (do not lock them up) If the steering wheel and or brake pedal pulsate... you most likely have a rotor problem. If your rotor has never been "turned" it is probably time to do so.

The ABS sensor is behind the rotor on the lower control arm pointed outward toward the rotor with a flat button face. You can not see the button face with the rotor installed. If the sensor is bad you will have an ABS light. I think your troubleshooting the wrong problem. i.e rotor vs your current focus of the ABS sensor.

I would like some feed back on the running dynamic on the road brake test.

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My 2003 mercury mountaineer ABS light is staying on. manually, the brakes work however they shimmy.changed the brake pads,checked the brake fluid and ABS fuse,bud when changing the pads,did now clean the...


I replaced the hub bearing assembly on drivers side twice and the light stayed on and the brakes worked fine. It was the wires (visible just above the tire on the frame) that rubbed against the frame that had shorted out. It was simply repaired and clip-stripped up out of the way. The light has been off every since then.

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2 Answers

2003 ford explorer abs light staying on


First question is: have you recently done, or had done, replacement of bearing hub assemblies or brakes? If so, check the wheel speed sensors on those wheel hubs. Second, look for the connectors, located less than 2 ft away from the hubs, and ensure they are snug. Much of the diagnostic work after the above has to be done by the dealer- these are of course complicated and sensitive systems. But there's no need in spending the cash unless you're sure it's a complicated breakdown.

Nov 24, 2009 | 2003 Ford Explorer

1 Answer

ABS light on


Sounds like a bad ABS sensor. Which unfortunately is usually built into the HUB assembly and the whole thing needs replacing. Take is to a garage that has an ABS diagnostic tool and they can tell you which wheel is throwing the code and then go from there

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ABS, TRAC OFF, and service vehicle soon light are all on. Mechanic put new wheel bearing and replaced wires that had been coroded. A week later the lights are all back on.


Sounds exactly like the problem I had on my 2003 grand am. I can almost guarantee you have a bad wheel bearing. The change in pressure on the bearing from turning causes the noise to change. The wheel speed sensor is also integrated into the wheel bearing hub assembly which is sending the signal to turn on your brake light.
I would change both front hub assemblies. Ran around $300 for me to do both and put them on myself. Its a very simple job to do yourself if you have the right tools. Make sure you have a "pulley puller" to pull the hub assembly off the CV shaft. You should be able to rent one from a local parts store like Autozone if you don't know someone that already has one.

Mar 26, 2009 | 2004 Pontiac Grand Am

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