Abs on while braking

Does it stay on? Is this a new trailer for you?
My ABS light on the dash comes on for like 7 seconds when I first apply the brakes and then goes out.Only when I'm hook to my trailer. I'm told it's because my 03 pete doesn't recognize the newer ABS system on the 2013 trailer I pull. It's the only trailer I've been hooked to with it so I don't know if it would do it with an older trailer. Your truck is newer so I doubt it's the same thing.

 

Any codes stored? That's where I would start.

 

If there is an ABS fault the ECU will disable the system and revert to normal braking until the repair is made. That's probably why you are getting zero volts. The fuse should be under the CB holder. There should be two screw in the cup holder area you have to remove to get to it. The diagram should be under the lid.

 

It's been so long since I've been in a Volvo and I believe some changes were made in 2010. There's the under the hood panel with some fuses and relays I believe on the firewall. Where are you checking for voltage at on the truck end or at the other end of the pigtail? The pigtail could be bad. If you have an ohmmeter ohm it out.

I like to think 90% of ABS problems are a bad or dirty sensor but that usually throws a solid light.

 

My scenario : 2013 Volvo ‘VNL’ suddenly starts showing the trailerABS light on the dashboard & activates ABS light on every container chassisor trailer I hook up to - just for a moment - when braking (after on/offself-test when the ignition is turned on). One of our two garages tells me they fixed the problem - not so ; our other garage tells me this is normal. Try explaining that to a Bear . After reading widely on this interweb thingey, I found a reference to the Trailer AUX circuit . That’s the honkin’ big 40-AMP fuse in the fuse-boxunder the hood . Once replaced , theproblem went away .