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B16 Maintenance Code Question

1.3K views 15 replies 9 participants last post by  ATL RL  
For the 2019-2023 MYs, the MM calls for rear diff fluid change at the 2nd OCI. This is normally about 15K miles. Sounds like the dealer changed the engine oil at 2300 miles (probably because of time, not miles) and reset the MM oil life. Now, ~7500 miles later you’re seeing the B16 code. I would just go ahead and change it now. You won’t see the 6 code for another 30K miles. Curiously, the 2024 and 2025 MMs call for the rear diff fluid change on the first OCI.