Hello all, work for a small fleet, got a 2020 kw t880 in the shop with an intermittent abs code. code is a 30-23. "Modulator commons shorted ground (spn 802 fmi 4 blink code 12-7). I tore the abs module out of the dash to inspect connectors terminals and wiring, all was ok. I disconnected one by one each modulator valve, my truck has 6, couldnt pinpoint one specific one. followed the trouble shooting tree in bendix acom program. Is it possible i have a bad module? code will become active and inactive randomly just sitting here over a couple hours. Thanks!
BENDIX EC-80 ATC ABS FAULT
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by tjtyler3915, Oct 5, 2022.
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Most common you will find a modulator common shorted somewhere on the ABS chassis harness. Ohm to ground on the chassis harness at the firewall connector. You can usually shake it down to find the rub.
Josegoo, tjtyler3915, spsauerland and 1 other person Thank this. -
Low voltage to ABS module or a bad battery can also cause this FC if you can't find a short to power at all... Same exact issue two weeks ago. Batteries weren't even two months old. It would read about 2 Volt on common until I changed out batteries. One tested shorted cell. Rush Truck Center "special" economy line batteries. We had a weird crank issue on one truck and transmission shifting issues on another because of these batteries.
Last edited: Oct 6, 2022
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Goodysnap and spsauerland Thank this.
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Josegoo Thanks this.
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I might of found the problem. I followed the wires back up against the firewall it’s a brown connector right behind the steering column I wiggled the connector and noticed that the connector was making bad connection. I unplugged it cleaned the pins and made sure it clicked in place this time and the problem hasn’t came back. Thank you for the advice!
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