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2004 chevy trailblazer. Abs brakes have been replaced as well as the disc, hub and sensor assembly. Still getting a brake light and warnings to check 4 wheel drive. Taking it in for transmission next. Could this be the ECM? Or what do you think? The battery was pulled to clear codes.

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  • Cars & Trucks Master
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The 4wd module is known problem for tr-bl its located drivers side dash remove the access panel need to open door and is behind the panel ---some have removed the 4 wd fuse and let it reset for a couple of days

Posted on Nov 15, 2017


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Posted on Jan 02, 2017

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SOURCE: I replaced both front wheel

It sounds very much like whatever happened,however it happened,your brakes are always on.Troubleshooting ABS at home is very tedious and time consuming.Your best bet would be to get a computer analysis as it would take easily 5 hours to go through the process at home what the computer does in less than 5 minutes.The car wanting to stall is a very good indicator that your brakes are practically locked on since you have the relevant lights on also.Did you unplug any connectors?If not,you should try to avoid driving this car around until it is fixed.If it hasn't happened long,you can probably save your brakes.One I answeredearlier was way too late for them.They said that their gas consumption has gone way up along with other signs.They definitely need brake pads,rotors,and discs and brakes are probably glazed over.Slow acceleration.If you have any questions or need more help,just comment here and I will get an autolink to your post and reply ASAP.Greg

Posted on Nov 28, 2010

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SOURCE: BMW x5 warning light fiasco

Hello This is Mike,,

Sometimes.... Sometimes this will take care of some of those faults and codes, and it only takes a few minutes to do. I know your problem is not exact as this reset method says, but however you would be amazed on this fixes a lot of things, it like a cheap way to reset computer and fixes a lot of things back to default mode. Try it and let me know. Mike


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Posted on Oct 17, 2011

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SOURCE: remove rear hub assembly

Here's a link,remove o ring as listed.

Posted on Oct 28, 2012

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SOURCE: I have a 2005 Chevy trailblazer ls 4 wheel drive

You would need to check the computer for trouble codes, fix the problem, then erase the codes. If the codes do not return, the warning light should stay off.

Posted on Jul 14, 2013

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SOURCE: the brake warning light stays on , i recently

Check the fluid level in the master cylinder and make sure its full.They usally have a sensor to let you know when the fluid is to low.

Posted on Oct 31, 2013

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1 Answer

Abslight stays on. How to fix? This is a2007trailblazer?

First you need to have EBCM - electronic brake control module check for DTC'S - diagnostic trouble code's . If the light is on there is a code stored . I think most part stores can do this and for free . After you find out what code is stored , looking up that code in service repair information for diagnostic trouble shooting chart would be next step . There are a few codes too.
DTC C0035 or C0040
DTC C0045 or C0050
DTC C0110
DTC C0131
DTC C0161
DTC C0186
DTC C0196
DTC C0201
DTC C0240
DTC C0241 or P0856
DTC C0244 or P1689
DTC C0245
DTC C0283
DTC C0287
DTC C0290 or C0292
DTC C0455
DTC C0550
DTC C0558

Find the code do the diagnostic's , fix the problem , wiring issue's , a sensor , bad module ,what ever it is . The light will go out then . Here is a sample of code discription .
• DTC C0035 Left Front Wheel Speed Sensor Circuit
• DTC C0040 Right Front Wheel Speed Sensor Circuit

Dec 30, 2016 | 2007 Chevrolet Trailblazer

1 Answer

2004 chevy trailblazer how to remove the abs

just pull the fuse will take less than a minute or removing system a few hrs if all goes well because to remove the sensors you have to remove the wheels and rotors and unbolt it from hub which will leave a 1/4 inch whole open to the hub ---to remove the abs uni need to remove the hard line brake lines add short lines and bleed the whole system by removing the fuse the system will be standard power brakes

Sep 28, 2015 | 2004 Chevrolet TrailBlazer

3 Answers

What is the ABS system?

the ABS is anti brake skid which is designed to stop wheel lock up under brakes and allow steering control at all times
it was originally designed for aircraft to stop the under carriage from being ripped from the plane when the wheels (under brakes on landing ) hit a wet patch , snow or ice on the runway
it works by each wheel having a segmented sender that is read by a sensor and this impulse switches on valves in the electric pump in the hydraulic system so that when the wheel stops turning ,brake pressure to that wheel is released momentarily and then reapplied when the wheel turns again
the person using the brake still feels the same brake pressure under the foot and in extreme situations will feel the brake pedal pulsate
Now the ECM continually monitors the ABS system and when fluid sensors, or electronic sensors fall outside set parameters , the ABS light comes on to let you know that there is a problem with the brakes
you should now be having the fault codes read to find the reason for the light and have it repaired as in some systems ,if the repairs are not effected then the vehicle is put into limp mode by the ECM and that reduces the power available and the speed of the vehicle.

Jul 25, 2015 | 2004 Dodge Caravan

1 Answer

The brake warning light stays on , i recently replace the bearings and hub assembly , ABS light is off but the brake warning light stayed on

Check the fluid level in the master cylinder and make sure its full.They usally have a sensor to let you know when the fluid is to low.

Oct 31, 2013 | Ford Explorer Cars & Trucks

1 Answer

I have a 2005 Chevy trailblazer ls 4 wheel drive that we just replaced the wheel bearing/hub assembly and put new brakes and rotors on now the abs light came on and won't go off. How do we reset it?

You would need to check the computer for trouble codes, fix the problem, then erase the codes. If the codes do not return, the warning light should stay off.

Jul 13, 2013 | Cars & Trucks

1 Answer

Service brake system warning on driver info center on dash

Possibly a defective ABS sensor, or low brake fluid. Recommend a reputable mechanic to assess the issue.

Oct 12, 2017 | 2004 Chevrolet TrailBlazer

1 Answer

2004 Chevy Trail Blazer,blower fan not working and the brake and ABS lights are on in the dash, checked all fuses,nothing blown. Can not seem to narrow down which relay goes to this section. Any thoug

Hello Linda! Replacing the HDM relay for the low beams will not trigger any of these problems. If the blower isn't working, you probably need to get a new blower motor resistor (for manual controls) or blower motor module (looks the same) for automatic climate control. To access, need to remove the plastic kick panel near your feet on passenger side. After removed, look up you'll see the resistor, it's about 4" long with 2 small screws in it. You'll also need to drop the glovebox door to remove the connector from the resistor to the motor. Suggestion- buy a pig tail for the resistor also, these tend to melt. Very common problem. The ABS dash could be a bad wheel hub assembly or a hub starting to go bad.

Jan 24, 2018 | 2004 Chevrolet TrailBlazer

1 Answer

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.

I’m happy to help further over the phone at

Apr 24, 2012 | 2004 Chevrolet TrailBlazer

2 Answers

The abs and safety brake light has come on. Is this a fuse problem

check your brake fluid level, brake system, wheel sensors. Dirty wheel sensors usually cause the ABS light to come on. As for the brake warning light, it may be low on fluid (possible leak) or faulty E-brake switch.

May 22, 2010 | 2002 Chevrolet TrailBlazer

2 Answers

ABS under 10 mph goes off...feels like we won't stop!

Like the other person mentioned, if you have a faulty sensor or bad connection, that would trigger the light. That may also be triggering your ABS to kick in when it doesn't need to. On each wheel, there will be a sensor with some wires coming out of it located on the inside of the axle just behind the rotor. You'd have to test each sensor to determine if one or all of them are faulty.

Sep 25, 2009 | 2002 Chevrolet TrailBlazer

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