ABS ISSUE

So I get in my 2007 4x4 Monday and the abs lights are on. Searched and read many threads and haven't found my exact issue. Took it to local napa, has codes for all 4 sensors bad, an open circuit in abs sys, and metal on rr sensor.

Fuses are good, 11.36 v to all four sensors, have resistance on both rear sensors (didn't check front)' pedals been spongy for a while but I think that's the master cyl. Also, grease on front sensor and gear oil on rears. I've read on here the oil on rear sensors means bad rear seals but no oil on outside of axle. Have also checked front wheel bearings and both seem good to me. I've also removed and cleaned all sensors.

Any help is appreciated.

 

If it's a manual transmission there is a fifth sensor in the transfer case. It probably a loose connector somewhere.

 

11.36 volts?? should it not be 12 or more?

 

It is manual, thank you, I'll check this.

 

Truck was off, radios on, etc. Thank you.

 

It's the sensor closest to the rear driveline yoke. Can't miss it.

 

ok what does your voltage read when its running then?? fully charged battery should read 12.4 volts on or off. many things on modern vehicles will not work right with low voltages. some wont even start at 11.5 volts cranking