The B16 Maintenance Minder code on an Acura calls for an engine oil and filter change with a multi-point vehicle inspection, plus a tire rotation and a rear differential fluid change.
It decodes left to right. The letter is the main item and the digits are sub-items, each of which has independently run down its own service interval. They surface together simply because they finished counting at the same time, which is why your Acura shows different combinations at different stages of its life.
An Acura dealer is the default choice, but not the only one. Acura sits under the same parent company as Honda and draws on the same parts supply, so a Honda service department is a legitimate and often cheaper option for B16.
Acura B16 Service Cost
The Acura B16 service typically costs $220 to $425. Where you land depends on your model, engine and local labor rate. Since these are independent jobs bundled into one visit, always ask for the invoice itemized.
| Item | What it covers | Typical cost |
|---|---|---|
| “B” | Oil and filter change, plus multi-point inspection | $90 – $180 |
| “1” | Tire rotation | $30 – $45 |
| “6” | Rear differential fluid | $100 – $200 |
| Total Acura B16 service | $220 – $425 | |
| Doing it yourself (parts only) | around $120 | |
The Rear Differential Service in B16
A 6 in B16 tells you something definite about your car: it drives all four wheels. Sub-item 6 is a rear differential fluid replacement, and on an Acura that means Super Handling All-Wheel Drive. Front-wheel-drive Acuras — the ILX, the Integra and the front-drive TLX and RDX — have no rear differential and will never display it.
This is the shortest interval in the entire Maintenance Minder scheme. Acura schedules it at around 15,000 miles for the first change and every 30,000 after, and halves that under severe use. Because it falls near an oil change it very often turns up bolted onto another code, which is why owners so often assume it was part of the oil service rather than a separate line of work.
SH-AWD is not a simple differential. It vectors torque across the rear axle using clutch packs, and the fluid is part of how those clutches engage. The wrong fluid, or fluid left far too long, announces itself as a shudder or a groan on tight low-speed turns — a multi-storey car park is where most people first notice it. Once the clutch packs are worn, fresh fluid does not reliably cure it.
When Is the Acura B16 Service Due?
Mileage is the wrong way to think about it. Acura’s algorithm watches how the engine is actually used — operating temperature, trip duration, load, revolutions — and adjusts accordingly. Two identical cars can be thousands of miles apart when B16 appears, and both are correct.
The countdown is visible before it becomes urgent: a wrench symbol at 15% remaining oil life, a firmer message at 5%, and a negative distance readout once it passes zero telling you how far past due you now are.
The differential fluid element also has its own, much shorter cycle of roughly 15,000 miles, which is why it resurfaces more often than owners expect.
Acura Models That Show the B16 Code
Any Maintenance Minder–equipped Acura can show B16: MDX, RDX, TLX, ILX, Integra, RLX, ZDX and TSX. The jobs are the same throughout, but oil capacity, fluid specification and labor time all shift with the engine, so the bill lands differently on a four-cylinder Integra than on a V6 MDX.
The 6 narrows things sharply. Only SH-AWD cars carry a rear differential, so this code cannot appear on a front-wheel-drive ILX, Integra, TLX or RDX.
Check your owner’s manual for the exact fluid specifications your engine needs before booking.
Will Your Acura Warranty Pay for the B16 Service?
Only the basic portion, and only if the car is young enough. Acura covers A1 and B1 services for two years or 24,000 miles on 2023 and 2024 models, cut to the first scheduled service within 12 months or 12,000 miles for 2025. B16 reaches past that.
Two details catch people out. The term starts from the original in-service date rather than your purchase, and the work must be done at a participating Acura dealer using Acura Genuine parts. Ask for the invoice itemized so you can see which lines the program absorbed.
Related Acura Service Codes
- Acura B12 service code
- Acura B13 service code
- Acura B14 service code
- Acura B15 service code
- Acura A16 service code
- Acura B17 service code
- Acura B1 service code
- Acura B123 service code
- All Acura Maintenance Minder codes — the full reference table
- How to reset the Acura Maintenance Minder
Acura B16 Service FAQ
What does the Acura B16 code mean?
The “B” is an oil and filter change with a multi-point inspection, and each digit after it is a separate job that has come due at the same time. For B16 those are a tire rotation, a rear differential fluid change. It is a bundle of independent services, not one procedure.
How much does the Acura B16 service cost?
Typically $220 to $425 at a dealer or independent shop, depending on your model and local labor rate. The breakdown by sub-item is in the table above. Acura and Honda dealer pricing is broadly comparable, so a Honda service department is worth a call for a second quote.
Can I do the Acura B16 service myself?
Partly. The oil and rotation are easy, but the differential fluid needs the correct SH-AWD specification and a level fill, which is fiddlier than it sounds. Parts alone come to roughly $120.
Is B16 covered by Acura complimentary maintenance?
Not fully. The program covers A1 and B1 services for two years or 24,000 miles on 2023 and 2024 cars, and only the first scheduled service within 12 months or 12,000 miles on 2025 models. B16 includes work beyond that, so expect the additional items to be chargeable. The oil and rotation portion may still be covered, so ask for an itemized invoice.
Does the B16 code mean something is wrong with my Acura?
No. B16 is a maintenance reminder shown with a wrench symbol, generated by the Maintenance Minder’s own countdown. It is not a diagnostic trouble code. A check engine light comes from a different system entirely and points to a stored fault. If both are showing they are unrelated, and the check engine light is the one to look at first.
How do I reset the B16 code?
An Acura dealer will reset it as part of the job. Doing it yourself: touchscreen models use Settings, then Vehicle, then Maintenance Reset, while older cars use the SEL/RESET stalk button or trip knob held for around ten seconds with the ignition on. On a multi-item code like B16 you can reset sub-items individually — do that rather than clearing everything, or the car will stop tracking jobs you have not actually done. Our Acura Maintenance Minder reset guide covers each method by model.