ABS light on. Weird
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New User
Joined: Sep 2008
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ABS light on. Weird
I am new to the forum and would like to say thanks in advance. I have a 99 F350 Super Duty 7.3 diesel with auto trans. My abs light came on the other day and there are no codes. When I start up the light goes off for a second and comes on steady without moving the vehicle. The speedo works fine, fluid is full. The weird thing I noticed is that if I start up with my foot on the brake the light will stay off untill I release the pedal then it comes on and stays on. Any help will be greatly appreciated.
Tuned
Joined: Apr 2007
Posts: 290
Likes: 5
From: Greene County,TN.
When you say you don't have any codes, what scan tool did you use? A normal OBDII scanner will not communicate with the ABS system.
BTW, it is normal for the light to come on right after startup, then go out. This is what is called proveout. The light coming on, and staying on can be a number of things. When the vehicle is first started, the system checks everything real quick. If it "sees" anything out of range, it'll turn the light on and shut down the system.
BTW, it is normal for the light to come on right after startup, then go out. This is what is called proveout. The light coming on, and staying on can be a number of things. When the vehicle is first started, the system checks everything real quick. If it "sees" anything out of range, it'll turn the light on and shut down the system.
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
If the light's on, there should be a code - but who knows...
The only way that light is turned on is when the ABS module turns it on, so there's no outside switch or something telling it to come on.
However, if the float switch in the master cylinder reservoir is bad, it'll light the ABS light.
I'd check if it's bad.
The only way that light is turned on is when the ABS module turns it on, so there's no outside switch or something telling it to come on.
However, if the float switch in the master cylinder reservoir is bad, it'll light the ABS light.
I'd check if it's bad.
