KW T800 ABS Code

[Hunter013]

SPN: 789 - FMI: 9 Drive axle left wheel speed sensor, output low at drive-off

I checked all drivers side sensors and they’re at roughly 1500-1600 ohms. What else should I check? I’m not familiar with abs systems.

 

[Truck Shop]

How old of truck? Is the cable in good condition the entire length? Is it a two
piece cable with connection in middle? Is cable held emplace to brake hoses
with wire ties instead of factory cable clips? Is the sensor pushed back from
tone ring?

 

[heymccall]

Are the wheel bearings loose/ worn/ damaged?

 

[stinky64]

If your bearings not loose, no greenies at connections give the sensors a little tap in toward the tone ring to eliminate the air gap issue. Also curious about year and hub/tone ring configuration.

 

[Truck Shop]

The fact he's in Wisconsin with the salt, more than likely the sensors are frozen in the
mounting sockets.

 

[heymccall]

Had to swap rotors out on our '07 C7500 a while back because the tone rings were rusted to the point of barely having teeth. But, they lost resolution at higher speeds. You is losing resolution at low speeds.

 

[stinky64]

The fact he's in Wisconsin with the salt, more than likely the sensors are frozen in the
mounting sockets.

Am also a resident of the Great Lakes salt belt and have been a sensor tapper from way back. 90% of the time if you can get to them they will move. Sometimes on drive axles ya gotta use special bent long punch that was custom run over with a set of doubles to get the job done.

 

[Truck Shop]

Am also a resident of the Great Lakes salt belt and have been a sensor tapper from way back. 90% of the time if you can get to them they will move. Sometimes on drive axles ya gotta use special bent long punch that was custom run over with a set of doubles to get the job done.

Quite familiar with moving sensors, It was pretty common on ours to find them froze especially
the ones running ND.

 

[Hunter013]

It's a 2020, so nothing is very crusty on it. I found a bare wire going to one of the modules, which I was able to repair, but it did not fix anything. I looked on the trucks dash and it said "SA Left Wheel Speed Sensor". Does that mean steer axle left side? The SPN: 789 - FMI: 9 is still the only code on the computer.

 

[Truck Shop]

yes.