Abs and traction control light [Archive] - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

: Abs and traction control light


JCOLEMAN45177
09-20-2009, 04:28 PM
i have an 06 trailblazer ls. about a month ago my abs and traction control light started coming on and off. now they pretty much stay on. the code came up as right rear wheel speed sensor so i changed it and it is still throwing the codes and lights came back on......please help. thanks:confused:

the roadie
09-21-2009, 01:13 AM
What code EXACTLY are you seeing now?

JCOLEMAN45177
09-21-2009, 09:35 AM
C0050. code for wheel speed sensor. just replaced it yesterday. today i noticed the lights would flash from time to time and eventually went off until i stopped the truck. after i turned it off and restarted it only the trac control and svc trac lights were on. abs light would only come on at a complete stop.

BUC NASTY
09-21-2009, 01:45 PM
C0050. code for wheel speed sensor. just replaced it yesterday. today i noticed the lights would flash from time to time and eventually went off until i stopped the truck. after i turned it off and restarted it only the trac control and svc trac lights were on. abs light would only come on at a complete stop.

i have the same problem. i thought mine had something to do with the tune dealing with the speedometer...claiming that its incorrect. still working on it like you

bullguy
09-23-2010, 07:21 AM
I am also having the same problem since two weeks,roadie you can really give us the solution for this problem.
Thank you

bullguy
10-04-2010, 09:03 AM
Yesterday i too my TB to stealership and asked them to diagnosis my problem they said it will take atleast 12 days and after they find the fault it will take another 10 days to repair as they are loaded,so i just took my vehicle to one of the private workshop they diognosed and found out that one of the left front speed sensor has to be replaced.
i will replace it probly tomm and see what will be the status.

bullguy
10-04-2010, 09:04 AM
#03-05-25-007D: Antilock Brake (ABS) Activation at Low Speeds (Clean Wheel Speed Sensor
Mounting Surface) - (May 1, 2009)

Subject: Antilock Brake (ABS) Activation At Low Speeds (Clean Wheel Speed
Sensor Mounting Surface)
Models: 2002-2006 Cadillac Escalade, Escalade EXT
2003-2006 Cadillac Escalade ESV
1999-2006 Chevrolet Silverado
2001-2006 Chevrolet Suburban, Tahoe
2002-2006 Chevrolet Avalanche
2003-2006 Chevrolet Express
2007 Chevrolet Silverado Classic
1999-2006 GMC Sierra
2001-2006 GMC Yukon, Yukon Denali, Yukon XL, Yukon Denali XL
2003-2006 GMC Savana
2007 GMC Sierra Classic
2003-2006 HUMMER H2

This bulletin is being revised to add the 2007 Silverado/Sierra Classic models. Please discard
Corporate Bulletin Number 03-05-25-007C (Section 05 -- Brakes).

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.
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.

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.

Parts Information

Part Number Description Qty
89022217
(Canadian P/N 89022218)
(Package of 2 cans)
Rust Penetrating Lubricant
(Each can will service 50+ vehicles)
1
01051344
(Canadian P/N 993037)
(Package of 12 tubs)
Wheel Bearing Lubrication - Tub
(Each tub will service 25+ vehicles)

JCOLEMAN45177
11-10-2010, 12:43 PM
i have the same problem. i thought mine had something to do with the tune dealing with the speedometer...claiming that its incorrect. still working on it like you

Have you fixed your issue yet? i have had no luck.:bonk:

JCOLEMAN45177
11-10-2010, 01:13 PM
i have replaced the right rear wheel speed sensor again as the code reads, i have also replaced the left rear and the speed sensor in transmission. still have same code and lights came right back on after clearing them once i reached about 8 mph. also, i now have code running lean in bank one. any and all help is appreciated.:bonk:

JCOLEMAN45177
02-21-2014, 06:35 PM
its been a while and i am still having issues. abs, traction control and service stabilitrak lights still on solidly. i have done major reading and have changed and done just about everything except for cluster. any more advice? :confused: