Question about 2004 GMC Sierra Denali

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Replacing ABS speed sensors - 2004 GMC Sierra Denali

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On any given wheel. Raise that corner...pull off the tire/wheel....mounted on the backside of the rotor...you'll find a sensor mounted to the spindle...usually on top. It should be the only thing mounted there with a wire leading to it.

theroadisalover

Posted on Jan 02, 2011

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2 Answers

Abs light on but not always


It could imply that the sensor is shifted or defective.

Aug 07, 2015 | Cars & Trucks

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I push on my brakes and the pedal vibrates back to me.. i think it mite be the abs sensor.(ABS LIGHT IS ON) easy to replace?


If it does this in the slippery weather , then that is a normal brake feed back. The light should not stay on. If it does it may be the sensor. Take it in to your mechanic.

Feb 24, 2015 | Cars & Trucks

1 Answer

Vehicle speed sensor


The actual vehicle speed sensor is transmission mounted on these. However if you are looking for the abs speed sensor, these are made right into the wheel bearing hub assemblies on gm W bodies which include this model. Unfortunately you can't replace just the abs sensor on these without replacing the whole hub. A word of advice. I work in the field and if you do replace the hub just for an abs problem, don't skimp on the price. The cheap hub assemblies go out within a year and you will just have wheel bearing problems then.

Mar 09, 2013 | 2002 Chevrolet Impala

1 Answer

2001 buick park avenue ABS wheel speed sensor replacement


what you wont to replace ABS or speed sensor.

Mar 01, 2013 | 2001 Buick Park Avenue

2 Answers

Suddenly the ABS light came on. Fluid OK, sensors not broken. Is there a way to check the speed sensors?


The abs light,has to do with the brakes,if the sensors have been checked then the brake liners most likely need attention,if the vehicle does not stop correctly the abs light will come on.

Apr 23, 2010 | 1993 Buick Roadmaster

1 Answer

I have a 2000 GMC Yukon XL 1500. The antilock braked engage when slow to about 5 to 8 mph.


Here is a copy of a GM bulletin that applies to you concerns of low speed ABS activation.

Antilock Brake (ABS) Activation At Low Speeds (Clean Wheel Speed Sensor Mounting Surface) #03-05-25-007 - (09/29/2003)
Antilock Brake (ABS) Activation At Low Speeds (Clean Wheel Speed Sensor Mounting Surface)

1999-2004 GMC Yukon XL

Condition:
Some customers may comment on ABS activation at low speeds, usually below 8 km/h (5 mph). Upon investigation, the technician will find no DTCs set.

Cause
The cause of this condition may be an increased air gap between the wheel speed sensor and the hub reluctor ring due to rust and debris built up on the sensor mounting surface.

Correction
Measure AC voltage and clean the wheel speed sensor mounting surfaces.

Raise and support the vehicle.
Disconnect both the front wheel speed sensor (WSS) connectors at the frame and harness.
Place a Digital Volt Meter (DVM) across the terminals of each WSS connector.
Rotate the wheel clockwise approximately one revolution per second. The minimum reading should be at least 350 ACmV's. If the reading is less than 350 ACmV's, remove the wheel speed sensor. Refer to the applicable Wheel Speed Sensor Replacement procedure in the ABS sub-section of the Service Manual. Plug the WSS bore in order to prevent debris from falling into the hub during service.
Clean the WSS mounting surface on the hub to remove any rust or corrosion using a wire brush, or equivalent.

Important
Make sure that the sensor sits flat on the hub. Check the sensor flange against a straight edge to ensure flatness. If the sensor flange is distorted, replace the sensor.

Apply a thin layer of bearing grease to the hub surface and sensor O-ring prior to sensor installation. Use ONLY Wheel Bearing Lubricant, P/N 01051344.
Install either the original sensor or a new one in the hub. Ensure that the sensor is seated flush against the hub. Refer to the applicable Wheel Speed Sensor Replacement procedure in the ABS sub-section of the Service Manual.
Place the DVM across the sensor terminals and recheck the voltage while rotating the wheel. The voltage should now read at least 350 ACmV's.

Good luck and thank you for using Fixya.

Mar 09, 2010 | 2000 GMC Yukon XL

3 Answers

Abs comes on when turning at slow speeds when parking 2003 sierra


most likely you have a wheel sensor going out. The only way to tell which one is with a data scanner that can access the ABS system.

It will see all the tires spinning at the same speed until one shows a different speed.

Also make sure you have all the same tires and the air pressures are the same.

Mar 08, 2010 | 2003 GMC Sierra 1500

4 Answers

Abs light and brake light came on wont turn back off


There is a sensor at the top of the rear differential for the ABS system. That sensor went bad and replacing it took care of the problem. What caused mine to go bad was apperantly water got into the differential when launching and loading my boat. check to see if gear lube needs to be replaced also.
The answer above is perfectly correct. When the ABS sensor on the diff goes bad the speedo no longer will work, the odometer stops recording mileage and both brake and ABS light comes on. You also loose O/D or "Lock-up" in the torque converter. The sensor is inexpensive and can be changed in about 30 mins. Good Luck!
I second the second answer :) My ABS light was on, my BRAKE light was on, my CHECK ENGINE light was on, my SPEEDOMETER wouldn't work below 35 mph, then quit working alltogether. Once the speedomenter quit working the odometer and cruise control quit working. I replaced the rear differential mounted speed sensor ($33) and then reset the CHECK ENGINE light by disconnecting the positive battery cable for a couple of minutes. EVERYTHING then worked.
Replace rear differential speed sensor as follows:
a) remove parking brake cable bracket (1/2" socket)
b) remove speed sensor bolt (9/16" deep socket)
c) remove metal speed sensor cover
d) remove speed sensor from rear differential housing (use channel lock pliers, twist gently back and forth while applying upward pressure. Once the speed sensor has a small gap between it and the rear differential housing, insert a flat-blade screwdriver and gently apply upward pressure while gently twisting speed sensor back and forth.
e) disconnect speed sensor from speed sensor cable
f) lubricate new sensor with WD-40, insert into rear differential housing. It will NOT go in all the way by hand, so do NOT force it nor hit it with anything made out of metal.
g) replace metal speed sensor cover
h) Insert speed sensor bolt and tighten LIGHTLY until a small amout of pressure is felt. Tap speed sensor with rubber hammer until it pops into housing. Finish tightening of speed sensor bolt.
i) replace brake cable bracket, replace 1/2" nut and tighten
j) disconnect positive battery cable for 2 minutes, reconnect positive battery cable
h) start vehicle, enjoy,

Oct 21, 2009 | 1998 Dodge Ram 1500 4WD

1 Answer

How do I replace a bad(??) ABS speed sensor?


I cleared this by replacing the sensor mounted on top of the rear differential housing.

Jun 06, 2008 | 1999 Mazda Pickup

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