abs and brake light need help

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olbaid_83

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ok so on my wife's 02 1500 4.7 the abs and brake light come on once she gets on the highway. the speedometer also bounces slightly (2-3 mph) ive checked all fuses and the speed sensor appears to be in working order....im kind of stuck now....im not sure what to do next to track down the issue....the breaks still work and the truck is driveable but the light is irritating and with the bouncy speedo she cant really use her cruise control.....anyone have any pointers?
 
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olbaid_83

olbaid_83

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oh and the light turns off when the truck shuts off and doesnt come back on again until she breaks 40 mph ish
 

mikelr

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Sounds like the speed sensor in the rear diff, I had the same issue on my 99'
 
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olbaid_83

olbaid_83

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i checked the speed sensor though. at least the resistance is good. showed a hair shy of 2k ohms. what else do i need to do to ensure that it is good?
 

mikelr

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i checked the speed sensor though. at least the resistance is good. showed a hair shy of 2k ohms. what else do i need to do to ensure that it is good?

That doesn't mean it's working properly. Your symptoms are textbook RWAL (rear wheel anti-lock) sensor failure. Go to the dealer and pick one up for $40 bucks and your problem will be solved.
 
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olbaid_83

olbaid_83

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now are you talking about the speed sensor on the pumpkin or an abs sensor on the hub? i dont know if theres a sensor on the hub just going off what ive seen on jewtube
 

Bigtman07

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Sensor should be on top of the rear axle pumpkin. Been told also there may be one on the output shaft of the trans.

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mikelr

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now are you talking about the speed sensor on the pumpkin or an abs sensor on the hub? i dont know if theres a sensor on the hub just going off what ive seen on jewtube

The one on the pumpkin...
 
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olbaid_83

olbaid_83

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update....so i pulled the good sensor out of my truck to put into my wifes (same truck different motor) popped the top off of the sensor in the process.....now i need 2 sensors instead of just one lol
 

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