Abs and brake light issue

[grim hurst]

I know im not the only one. I have a brake issue.
Abs and brake light is on. Ive replaced: abs module and wheel speed sensors. And also cleaned all grounds, the problem is still there!
The fuse is good, no loose connection.
Is there anything else to try?
(no, i will not tape the lights where i cant see it lol)

 

[drakon543]

did you replace all 3/4 wheel speed sensors? the tone ring inside the hub can also get gunked up with debris and other such stuff throwing the tone ring pulses off and the abs module will only see a wheel speed sensor problem. there will probably atleast 1 other speed sensor on the truck that also deals with the abs system did you replace that one aswell. lastly when you replaced the wheel speed sensors were any of the caps broken off? under the plastic end cap there is like a magnetic pulse pickup coil. if the cap comes off the wires alot of times will pull out and wrap around the tone ring potentially throwing the tone pulses off. lastly did you check all the wires for breaks? part of the wire is exposed in the wheel well it might be insulated or coated but if a rock hits it hard enough it can still break the wires inside.

 

[Doubeleive]

unless you have a scanner that will read abs codes then you are just throwing money at it and guessing.
that being said what abs module did you use? it has to be a exact match by part number, not just one that fits.
and unless it was new then another used one could be bad also they get loose solder inside from years of going down the road.

 

[grim hurst]

did you replace all 3/4 wheel speed sensors? the tone ring inside the hub can also get gunked up with debris and other such stuff throwing the tone ring pulses off and the abs module will only see a wheel speed sensor problem. there will probably atleast 1 other speed sensor on the truck that also deals with the abs system did you replace that one aswell. lastly when you replaced the wheel speed sensors were any of the caps broken off? under the plastic end cap there is like a magnetic pulse pickup coil. if the cap comes off the wires alot of times will pull out and wrap around the tone ring potentially throwing the tone pulses off. lastly did you check all the wires for breaks? part of the wire is exposed in the wheel well it might be insulated or coated but if a rock hits it hard enough it can still break the wires inside.

yes, yes no caps is broken off and yes nothing is broken; ive checked everything.

ive did a diagnostic and came back as not responsive

 

[grim hurst]

unless you have a scanner that will read abs codes then you are just throwing money at it and guessing.
that being said what abs module did you use? it has to be a exact match by part number, not just one that fits.
and unless it was new then another used one could be bad also they get loose solder inside from years of going down the road.

Ive used the scanner, came back not responsive. Ive used
The original brand kels. Brand new

 

[Doubeleive]

Ive used the scanner, came back not responsive. Ive used
The original brand kels. Brand new

are the abs & brake light on all the time or just intermittent?
if it is intermittent then you need to scan it when the the abs light is lit up.
if it is on all the time and does not give you a code then you need a better scanner to dig deeper.
both the abs light and brake can light up for separate reasons but there will always be a reason why.

 

[pumpkin_hook]

I have a similar issue on a 2005 Tahoe LT AWD/stabilitrack. This is a recent purchase - ~150k.
Upon piurchase the ABS fuse was pulled - inserted fuse and started troubleshooting. The ABS/traction kicked in when stopping/starting respectively. I replaced front sensors - cleaned the mounting surfaces too. Same issue but somewhat less. I used a scanner to monitor wheel speeds - i could not determine why the ABS/Traction lights came on from the graph as they followed really close: both front together, driver & rear, passenger & rear.
I replaced the hubs (SKF) with sensors. The ABS/Traction lights still are intermittant. Again I could not determine why when reviewing the graphs.
Will calipers affect the feedback? These look original. Will steering & control arm bushings affect feedback? They do need to be replaced. I have not verified the harness(es) from the sensors to the brake module.
Is replacing the ABS control module next?

 

[treehan77]

Sounds like the abs module needs to be resoldered or replaced. Mine intermittently had brake+ abs lights and resoldering the connections fixed it. These modules are pretty expensive. And it’s free to try (if you have a soldering iron). There’s probably people on the internet that will fix it for you also, but free is what I like. YouTube has tons of videos

 

[treehan77]

 

[JonnyTahoe]

I have a similar issue on a 2005 Tahoe LT AWD/stabilitrack. This is a recent purchase - ~150k.
Upon piurchase the ABS fuse was pulled - inserted fuse and started troubleshooting. The ABS/traction kicked in when stopping/starting respectively. I replaced front sensors - cleaned the mounting surfaces too. Same issue but somewhat less. I used a scanner to monitor wheel speeds - i could not determine why the ABS/Traction lights came on from the graph as they followed really close: both front together, driver & rear, passenger & rear.
I replaced the hubs (SKF) with sensors. The ABS/Traction lights still are intermittant. Again I could not determine why when reviewing the graphs.
Will calipers affect the feedback? These look original. Will steering & control arm bushings affect feedback? They do need to be replaced. I have not verified the harness(es) from the sensors to the brake module.
Is replacing the ABS control module next?

Your ABS fuse may have been removed because the ABS may have been activating randomly. Mine was doing this (00 Tahoe) so I removed the fuse. Turned out to be a bad Hub wire.

 

[Rocket Man]

What scanner are you using? If you’re getting a light, there’s a code.

 

[Jakespeed63]

Sorry for not writing down the DTC, but when I scanned this 2011 5.3l Tahoe, the code was relative to the fluid level sensor, in the master cylinder reservoir.
As part of the brake service, for this customer, I flushed the system and removed the sensor for inspection(Autozone wanted $95 for a new one) After installing the old sensor and topping off the fluid level, the lights did not reappear. Both red brake light and yellow Stabilitrak lights would illuminate in the morning. Today it worked fine. Going to call this one fixed. Got off easy, compared to some of you.

JT

 

[pumpkin_hook]

Your ABS fuse may have been removed because the ABS may have been activating randomly. Mine was doing this (00 Tahoe) so I removed the fuse. Turned out to be a bad Hub wire.

The fuse was pulled initially, I replaced and removed it until I replaced the front hubs (SKF) complete with sensors. Initially the fault did not go away. A different scan tool captured it was the left rear that was causing the error. I ordered new rear sensors but have yet to install them as I have not had traction/abs faults in two weeks. Is there a re-learn process? Moving onto the next project - air bag sensors.

 

[PNWYukon]

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.

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in the General Information sub-section of the Service Manual.
2. Disconnect both the front wheel speed sensor connectors at the frame and harness.
3. Place a Digital Volt Meter (DVM) across the terminals of each wheel speed sensor connector.
4. 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.
5. Plug the wheel speed sensor bore in order to prevent debris from falling into the hub during service.
6. Clean the wheel speed sensor mounting surface using a wire brush, sand paper, emery cloth, scotch brite, or other suitable material. Be sure to thoroughly clean the wheel speed sensor surface. There should be no rust or corrosion.
7. Check the sensor head to determine if it has been warped/distorted due to the corrosion build up or other causes. Check the mounting surface on the sensor head for flatness by placing it on the edge of a metal machinists scale or other suitable straight edge to measure the flatness. Check the sensor for flatness in multiple (minimum 3) positions/directions. If the sensor head is distorted, replace the sensor.
8. Apply (spray) two thin coats of the specified rust penetrating lubricant (corrosion inhibitor) to the complete sensor mounting surface on the bearing hub. Allow to dry for 3-5 minutes between coats. Use ONLY Rust Penetrating Lubricant, P/N 89022217 (in Canada, P/N 89022218).
9. When the corrosion inhibitor is dry to the touch (about 10 minutes), 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 (in Canada, P/N 993037).
10. 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.
11. 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.