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Discussion Starter #1
I have a 2006 silverado 1500. last month or so started having problems with ABS where it randomly kicks in while braking and and when i hit bumps the ABS light comes on. Any and all help is appreciated.
 

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Mmm Sandwich
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Check your wheel bearings for play. But if you are getting a light it could just be the sensor itself.
 

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Discussion Starter #3
Check your wheel bearings for play. But if you are getting a light it could just be the sensor itself.
I have checked that. No play at all. Also sometimes the whole truck shakes when breaking (bad rotor?). Could that cause abs to mess up and is there a way too replace just the sensor?
 

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Mmm Sandwich
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yea you can replace just the sensor. And no rotor will not cause it. IF you are getting a code did you run the code to see what it says?
 

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This place sucks dicks
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Local auto store needs punch in the face. A code causes the ABS light to come on. All dummy lights have codes associated with them.
 

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Usually the little handhelds that parts stores have can't pull an abs code. If you have a friend who works in a shop with a higher end scanner, see if they can pull the code for you.
 

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Wheel bearing or broken loose tone wheel. Lose wire in the abs sensor. Wheel bearing may not have play when you check it. But it might be moving when the 5000lb trucks weight is on it.
 

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u need a better code scanner to read ABS codes....shitty ones at parts stores cant read those.

You might have air in the system or a faulty abs sensor. Go to a Midas or somewhere they do free inspections. have them diagnose and then walk away :roflmao:
 

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Discussion Starter #12
I have a programmer that can read check engine light but that's all it can check. Abs light comes on woke driving but useually goes off as soon as i hit the brakes.
 

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10:1 it's the sensor out of tolerance on the hub. Here's a tsb

Antilock Brake (ABS) Activation At Low Speeds (Clean Wheel Speed Sensor Mounting Surface) #03-05-25-007 - (09/29/2003)


Antilock Brake (ABS) Activation At Low Speeds (Clean Wheel Speed Sensor Mounting Surface)
2002-2004 Cadillac Escalade, Escalade EXT

2003-2004 Cadillac Escalade ESV

1999-2004 Chevrolet Silverado

2001-2004 Chevrolet Suburban, Tahoe

2002-2004 Chevrolet Avalanche

2003-2004 Chevrolet Express

1999-2004 GMC Sierra

2001-2004 GMC Yukon, Yukon XL

2003-2004 GMC Savana

2003-2004 HUMMER H2

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.

Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in the General Information sub-section of the Service Manual (SI Document ID #899664).
Disconnect both the front wheel speed sensor (WSS) connectors at the frame and harness.
Place a Digital Volt Meter (DVM) across the terminals of each WSS connector.
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. Plug the WSS bore in order to prevent debris from falling into the hub during service.
Clean the WSS mounting surface on the hub to remove any rust or corrosion using a wire brush, or equivalent.

Important
Make sure that the sensor sits flat on the hub. Check the sensor flange against a straight edge to ensure flatness. If the sensor flange is distorted, replace the sensor.


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.
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.
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.
 

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Discussion Starter #15
10:1 it's the sensor out of tolerance on the hub. Here's a tsb

Antilock Brake (ABS) Activation At Low Speeds (Clean Wheel Speed Sensor Mounting Surface) #03-05-25-007 - (09/29/2003)


Antilock Brake (ABS) Activation At Low Speeds (Clean Wheel Speed Sensor Mounting Surface)
2002-2004 Cadillac Escalade, Escalade EXT

2003-2004 Cadillac Escalade ESV

1999-2004 Chevrolet Silverado

2001-2004 Chevrolet Suburban, Tahoe

2002-2004 Chevrolet Avalanche

2003-2004 Chevrolet Express

1999-2004 GMC Sierra

2001-2004 GMC Yukon, Yukon XL

2003-2004 GMC Savana

2003-2004 HUMMER H2

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.

Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in the General Information sub-section of the Service Manual (SI Document ID #899664).
Disconnect both the front wheel speed sensor (WSS) connectors at the frame and harness.
Place a Digital Volt Meter (DVM) across the terminals of each WSS connector.
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. Plug the WSS bore in order to prevent debris from falling into the hub during service.
Clean the WSS mounting surface on the hub to remove any rust or corrosion using a wire brush, or equivalent.

Important
Make sure that the sensor sits flat on the hub. Check the sensor flange against a straight edge to ensure flatness. If the sensor flange is distorted, replace the sensor.


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.
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.
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.
Good info but it doesn't do it only at low speeds. It does it at any speed. Will still check same stuff tho.
 

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First, my brakes pulsed. Thought I needed new rotor, no big deal. Well, it stopped doing that and the ABS light randomly would come. Bumps seemed to cause it, but it would go away. No it's on all the time, except when I come to a stop. Bad thing is, since I got my 4.56 gears, I was already having those damn lights come on every other time. I was finally going to get that fixed but now with this new problem, they're blaming one thing on the other and I'm getting nowhere. Need to get this fixed first, so I can take on the other deal. And the gear install didn't cause this, those where done long before this started.
 

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Discussion Starter #17
Im thinking about getting new hub assemblies and trying that but it would be nice to know if that will fix it for sure or not. If i do and it does work ill be sure to let yall know.
 

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Mmm Sandwich
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Or you can actually get your codes read. Generally you don't get a code when the hub is bad
 

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If there's no play in your hubs, there's no point in changing them. If you do change them and the code goes away, it's because the abs sensor on one was bad. Chances are you have a broken wire on one of your front abs sensors. Get the abs code read and fix the problem rather than blindly throwing parts at it.
 

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Discussion Starter #20
Im tryin to find someone with a scan tool to read abs lights. I noticed one of the wires wasnt properly connected to the upper a arm and i put the holder back in place and as soon as i started it the light was on so im guessin more towards a bad wire connection somewhere. I had a cv axle replaced on that side of the truck right before the problem started and im wondering if maybe the sensor or wire got knocked loose. Will do more looking into after i get off mids Wednesday.
 
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