ABS activation at ALL speeds, the usual sensor/hub problem!

[Herman]

Hello folks,

I really don't want what to do anymore. 6 months ago I bought a 2005 Escalade with active braking (RPO JL4). Since day one I had brake and traction system troubles. At first the "traction active" was the problem. After replacing both wheel speed sensors, this topic was solved, but another one began...

After fixing the traction problem, the ABS started to activate randomly during braking AT ALL speeds, not only at low speeds like usual ! Sometimes I feel a brake pedal kick back.

Intermittent DTC codes shown even AFTER replacing the hubs:

- intermittent C0035 "L / R Wheel speed sensor"
- once or twice I had the code 0455 "steering wheel position sensor"
- just once C0110 "pump motor circuit"

BUT most of the time no DTCs are shown, because the truck obviously doesn't know that the ABS is active when it shouldn't be.

Actions taken until now:

- Cleaning ground wires below driver seat at the chassis
- replacing both front wheel hubs and wheel speed sensors with aftermarket parts TWICE!
- deleting all DTCs every time

What else could be the problem?

- are there more grounds in connection with the EBCM?
- maybe my rusty brake lines?
- is a broken wire likely? If yes, what are the common spots? Its more or less impossible to check the complete wiring of both ABS sensors and I ever read something like that happened.

I want to stop throwing parts like the steering angle sensor or the EBCM unit etc. into the car.

I have searched nearly ALL forums, but almost every ABS problem is finally solved with replacing the hubs and or sensors. Not in my case... I know I can simply pull the fuse, but that is not a long term option!

 

[TollKeeper]

Steering wheel position sensor, or YAW sensor, sounds like the culprit to me. These can cause all types of issues, where the system thinks its in one position, and is looking for a certain brake bias, and none exists because the steering wheel is not in that position.

I dont know how good this video is, but it might help.

 

[ks03]

I’d start by getting my hands on a scanner that can show wheel speeds. Then go drive and duplicate the concern. My guess is that the signal from one wss is dropping out. If so then you can start testing the associated circuit

 

[swathdiver]

Hello folks,

I really don't want what to do anymore. 6 months ago I bought a 2005 Escalade with active braking (RPO JL4). Since day one I had brake and traction system troubles. At first the "traction active" was the problem. After replacing both wheel speed sensors, this topic was solved, but another one began...

Did you use GM parts?

 

[ks03]

Did you use GM parts?

- replacing both front wheel hubs and wheel speed sensors with aftermarket parts TWICE!

 

[ks03]

@Herman escalade 2wd or AWD? Some aftermarket hubs intended for 4wd/AWD take issue with not having an axle nut helping to hold them together

 

[Herman]

Steering wheel position sensor, or YAW sensor, sounds like the culprit to me. These can cause all types of issues, where the system thinks its in one position, and is looking for a certain brake bias, and none exists because the steering wheel is not in that position.

I dont know how good this video is, but it might help.

But why is the ABS activation only random? Either the position sensor is faulty or not? I did a 1500mls road trip in two days without any troubles, next day again problems.

 

[Herman]

@Herman escalade 2wd or AWD? Some aftermarket hubs intended for 4wd/AWD take issue with not having an axle nut helping to hold them together

Its a AWD and I did not use GM parts. Got them from Rockauto. But also not the cheapest stuff and I replaced the sensors twice and both hubs once. Do you think a wrong torque could cause these troubles?

 

[exp500]

Herman, have you had it scanned on a test drive? Look at post https://www.tahoeyukonforum.com/threads/tech-2-owners-map.127187/unread

Maybe someone can assist you. You need a scanner .

 

[Herman]

Herman, have you had it scanned on a test drive? Look at post https://www.tahoeyukonforum.com/threads/tech-2-owners-map.127187/unread

Maybe someone can assist you. You need a scanner .

I have a scanner with GM software. I have compared the indicated wheel sensor speeds, they seem to work as they should do. Anything else I could focus on with the scanner?

 

[swathdiver]

Its a AWD and I did not use GM parts. Got them from Rockauto. But also not the cheapest stuff and I replaced the sensors twice and both hubs once. Do you think a wrong torque could cause these troubles?

The computers in these trucks do not like aftermarket parts. I put a new hub on a 2006 Pontiac and while the machining of the hub was fine, it caused the ABS light to go on because the sensor wasn't able to be read correctly.

If you do not tighten the spindle nut correctly on a hub, it will fail prematurely. On a GMT-900 1/2 ton, that number is 177 foot pounds.

Since you have a GM compatible scan tool, I would use that and the shop manual to run through the trouble shooting guide. You can subscribe to it at AllDataDIY.

 

[Herman]

The computers in these trucks do not like aftermarket parts. I put a new hub on a 2006 Pontiac and while the machining of the hub was fine, it caused the ABS light to go on because the sensor wasn't able to be read correctly.

If you do not tighten the spindle nut correctly on a hub, it will fail prematurely. On a GMT-900 1/2 ton, that number is 177 foot pounds.

Since you have a GM compatible scan tool, I would use that and the shop manual to run through the trouble shooting guide. You can subscribe to it at AllDataDIY.

Thanks, I have ordern the 3rd pair of sensors, this time GM.

 

[Herman]

UPDATE: Today I did the auto bleed and a brake line blew. I will replace all brake lines since they are rusty. Is that a possible cause for my problem?

 

[exp500]

While you are there, inspect brake hoses F/R for swelling.
Do a live data scan on test drive after repairs. And post all previous codes and if any more come up.

 

[Herman]

I will do. Just ordered the AGS CNC154KIT NiCopp EZ-FIT lines. I will let you know what will happen.

 

[Mike H]

Have you checked the rear wheel speed sensors and ABS Tone Rings? Mine is in right now for a bearing and seal replacement on the rear. We had the same issue when he put it back together, he said there was something inside the housing from the bearing that he'd never seen before and it was flopping around on one side and the other was solid (yeah he shoulda stopped there). Axle, seal and bearing back out and I head over to look at it. I find the sensor on the back side of the axle and figure that is for the ABS. So we get the sensor out and pulled the ABS Tone Ring out (with a bearing puller) and a new one (and sensor) is on the way to me. I'm contemplating having him pull the other axle back out and replacing that one also, but that requires a new bearing and seal so more $$. Part number is GM GENUINE 12479286

 

[Herman]

Update: After all brake lines have been replace ALL ABS troubles are gone! No more DTCs etc. Strange because I still don't see the connection but somehow it works!

 

[89Suburban]

Update: After all brake lines have been replace ALL ABS troubles are gone! No more DTCs etc. Strange because I still don't see the connection but somehow it works!

That's great!!!

 

[Bigcatfishking]

Have you figured it out yet? I have a 04 Denali 6.0 awd. My truck just started throwing abs and traction light. It was intermittently it pop on the off. Now when driving the abs and traction kicks on and off but the truck doesn’t want to go. When tooth lights are on it drives fine. I went to autozone to get codes. (C0035/ c0045/ c0040/ c0283 / c0196/ c0292. I haven’t started to replace any parts yet. Any help I really appreciate it

 

[Fless]

Have you figured it out yet? I have a 04 Denali 6.0 awd. My truck just started throwing abs and traction light. It was intermittently it pop on the off. Now when driving the abs and traction kicks on and off but the truck doesn’t want to go. When tooth lights are on it drives fine. I went to autozone to get codes. (C0035/ c0045/ c0040/ c0283 / c0196/ c0292. I haven’t started to replace any parts yet. Any help I really appreciate it

Yes, he figured his issue out. You didn't see it in post #17? And the OP hasn't been back here since the end of August.

I would recommend that you research the diagnostic path for each/all of the codes you have, as your issue may have a different cause.