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The code l9 is linked to a 3.55 electronic locking differential found on the 2018 Ford F-150. Why is having your differential lock essential? This feature ensures that all wheels rotate at the same speed, even without proper traction. In challenging terrains where one or more wheels may lose contact, the diff lock keeps all wheels powered, allowing you to continue moving in the intended direction. Typical repairs for a rear differential usually range between $200 and $400, covering bearing, seals, and fluid replacements. However, if you need to replace the gears, it can be quite expensive, with new gears costing at least $1,500.
The designation l9 corresponds to a 3.55 Electronic locking differential found on the Ford F-150.