Question about 2003 GMC Sierra 2500HD

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Speed sensor problem

How do you check the wheel speed sensor to find wether it's good or bad? 2003 Chevy 2500HD

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You need a special meter that tests what is called signal generators, high end automotive meter's can do this as well as many scanners that have live data stream capability. The test is run through the OBD 2 data link connector.

Posted on Mar 06, 2009

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Where are the speed sensors on a 2004 chevy trailblazer?


Assuming that you're talking about the front wheel speed sensors...
Your best bet is to replace both from wheel hub/bearing assemblies.

They'll cost about $100-$150 each.
When the wheel speed sensors are setting ABS codes it usually means that the bearings are bad.
When you replace the whole hub assembly, a new sensor is already installed in that hub. If it just the sensor (unlikely that just the front sensors alone are going bad) the sensor itself is usually 3/4 of the price of a new hub anyway.

Apr 24, 2012 | 2004 Chevrolet TrailBlazer

4 Answers

The speedometer does not work, brake light is on, 4 wheel drive light blinks and ABS light is on. I replaced wheel bearings and all four speed sensors. any suggestions?


If the speedometer doesn't work, I usually look for a VSS or vehicle speed sensor, but on the Ford Escape, the Wheel Speed Sensors detect speed.

The ABS light may be on if there isn't a signal going from the speed sensors to the ABS module, or the module is bad, itself.

I don't know about the 4 wheel drive light blinking, but it could signal trouble in that system, as well, as far as the electronic control of 4 wheel drive or the Transmission Range selector Also, does the transfer case have enough fluid in it?

Transfer Case NOTE: Repair of the transfer case is limited to seals, gaskets and output flange on automatic transaxle vehicles only. In vehicles equipped with a manual transmission, or if any of the geared components, tapered roller bearings, case cover or internal shafts fail, a new transfer case must be installed.
NOTE: The transfer case is sealed from the transaxle and has its own oil pump. The transfer case uses SAE 75W-140 synthetic gear lubricant and holds 12 ounces. The transfer case fill plug is located on the housing cover.
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The speedometer problem could also be a bad speedometer gauge, but that is rare, these days and is not indicated by the ABS light being on that says that maybe a signal has been lost to the wheel speed sensors themselves.

I hope this helps to understand what may be going wrong, even though you did the right thing by changing the wheel speed sensors.

Oh, by the way, I would scan the OBD-II computer with an ABS Brakescan tool to see if any particular wheel is still not reading or sending speed data to the ABS module.

May I suggest the Actron Brakescan tool which covers most domestic vehicles from 1996 to 2005?

Good luck on this repair.


Oct 15, 2010 | 2005 Ford Escape

1 Answer

2003 gmc sierra 1500 4 wheel drive truck kicks in to 4 wheel drive on its own while driving down the road


look out the code.. and check the speed sensors and the harness......check also the switch maybe you use the auto 4 wheel...thars why it engage its self automatically depending on the road,

Jun 27, 2010 | 2003 GMC Sierra 2500HD

1 Answer

Can bearings be chaaged on front wheel hub of chevy 2000 suburban 2 wheel drive


Good news: they can be changed. Bad news: you have to change the entire hub, they are sealed bearings. The hub should cost $230 to $250. I just put one on my 2500hd and it cost $235.

Jun 15, 2010 | 2003 Chevrolet Suburban 1500

1 Answer

My wheels are squeaking. The squeak starts just


you need to change your brakes. they have squeaker tabs on them to let you know they are worn real low.

Sep 05, 2009 | 2003 Chevrolet Silverado 2500HD

1 Answer

2002 gmc 2500hd 4wd abs problems


the problem is most likely a wheel speed sensor at one of the front wheels. retrieving a code in the abs system could pinpoint which wheel it is. i believe the wheel speed sensor is part of the bolt on front wheel bearing assy. if you plan on doing this yourself and are mechanically inclined. you will need an a/c volt meter to check sensors. let me know if i can assist further.

Dec 04, 2008 | 2003 GMC Sierra 2500HD

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