When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
We just bought a used 2012 F-350, we drove it highway miles only and yesterday our center message says check locking differential. What is this all about?
Well I'd first inspect all the wiring running into the rear diff, and if nothing appears damaged, loose or unplugged trace the wires to the front of the vehicle
On my 12 f150 we had the same issue, we live in salt country and the wires corroded, rendering the locking differential inoperable. Easy harness to replace as it is mostly under the truck and not tucked in too many crevices. I only got the message when trying to engage the locking dif (by pulling your 4wd selector **** out, not sure how it's done if you have floor shifter) you should not regularly be driving it with it locked, you'll destroy your rear end. Hope that helps
If you're fortunate enough to have a floor shifter like my '11 FX4 XL there's just a button on the dash center stack, between the radio and upfitter switches.
