The A16 Honda maintenance code represents an oil change, tire rotation service, and rear differential fluid replacement.
The “A” stands for an oil change, the “1” stands for a tire rotation, and the”6″ stands for a rear differential fluid replacement.
The A16 service is similar to the A1 service but it adds rear differential fluid replacement. It is typically performed by a Honda dealership or with a local mechanic.
Honda A16 Service Cost
The A16 service typically costs $180 to $345. The cost will depend on the specific Honda vehicle you have and the labor cost rate.
| Item | What it covers | Typical cost |
|---|---|---|
| “A” | Engine oil change | $50 – $100 |
| “1” | Tire rotation | $30 – $45 |
| “6” | Rear differential fluid | $100 – $200 |
| Total Honda A16 service | $180 – $345 | |
For simple maintenance services like the A16, most dealerships and 3rd party auto shops offer coupons and discounts. We suggest calling several locations beforehand to get the best deals.
“A” Service Cost
The “A” service, or oil change, typically costs $50 to $100 depending on the Honda model you have. It is a 30 to 40-minute service with the cost mostly from the parts. Some Honda vehicles, like the 2022 Pilot, require synthetic oil which is more expensive.
RepairPal also offers an “A” service (oil change) cost estimate for your vehicle and location:
Oil Change Estimator
“1” Service Cost
The “1” service, or tire rotation, typically costs $30 to $45. The tire rotation takes about 15 minutes of labor time. However, we suggest calling your Honda dealership or 3rd party auto repair shop for exact quotes.
RepairPal also offers a “1” service (tire rotation) cost estimate for your vehicle and location:
Tire Rotation Estimator
“6” Service Cost
The “6” service for Honda vehicles can cost $100 to $200 from the fluid depending on your vehicle. However, we suggest calling your Honda dealership or 3rd party auto repair shop for exact quotes.
YourMechanic offers an estimator for rear differential fluid replacement:
Rear Differential Fluid Replacement Estimator
Honda A16 DIY Cost
Want to save money or prefer to rely on yourself for your Honda’s maintenance? Performing an A16 service yourself will cost $100 to $200 depending on the brands and oil type you use.
We suggest using Honda parts or any aftermarket equivalents. Below are some oil and oil filters made for most Honda vehicles. Check online or at your local auto parts store for exact part numbers.
Oil Filter
Genuine Honda/Acura filters typically run $10–$15. Check the current price on Amazon.
A16 Maintenance Minder Description
The Honda maintenance minder code sheet above lists all the main and sub service items with A16 highlighted.
“A” Main Service Item
Honda describes the “A” service as an engine oil change only. Although it recommends oil change only, it is best practice to replace the oil filter whenever the oil is changed.
“1” Sub Service Item
Honda describes the “1” service as a tire rotation. In addition to rotating the tires, dealerships will also check the tire pressure and treads for wear or punctures.
“6” Sub Service Item
Honda describes the “6” service as a rear differential fluid replacement. Not all Honda vehicles have a rear differential to require this service.
When Is the Honda A16 Service Due?
The Maintenance Minder displays A16 when remaining oil life drops to 15%, which for most drivers falls between 5,000 and 7,500 miles after the last oil service — sooner with heavy city driving, towing or lots of short trips, later with steady highway use. Because the system reads actual operating conditions rather than counting miles, the exact figure differs from car to car.
The sub-items attached to this code run on their own longer intervals:
- 1 — Tire rotation: Every oil service
- 6 — Rear differential fluid replacement: ~30,000 mi
That is why the code changes over time: an A1 becomes A16 once those additional items fall due in the same visit.
Honda Models That Show the A16 Code
The A16 code can appear on any Maintenance Minder–equipped Honda, including the Honda Accord, Honda Civic, Honda CR-V, Honda Pilot, Honda Odyssey, Honda HR-V, Honda Passport, Honda Ridgeline and Honda Insight. The services it calls for are identical across the range, but oil capacity, fluid specification and labor time vary by engine. Always confirm the specification your engine requires in the owner’s manual.
Related Honda Service Codes
- Honda A1 — the same service without rear differential fluid replacement
- Honda B16 — the same items, but with an oil filter change and full multi-point inspection
- All Honda Maintenance Minder codes — the full reference table
The Rear Differential Service in A16
Seeing a 6 in A16 tells you something specific: your Honda drives all four wheels. Sub-item 6 is a rear differential fluid change, and it only exists on Real Time AWD and i-VTM4 vehicles — the CR-V, Pilot, Passport and Ridgeline. A front-wheel-drive Civic or Accord will never display it.
This is the shortest interval in the whole Maintenance Minder scheme: roughly every 15,000 miles, and half that if you tow or drive in deep snow or sand. That is why it turns up attached to an oil change so often, and why owners frequently assume it is part of the oil service rather than a separate job.
The fluid is specific and cheap to get wrong. Older VTM-4 systems take Honda’s dedicated VTM-4 fluid; newer i-VTM4 units call for a different specification again. Neither is gear oil, neither is ATF. The symptom of the wrong fluid, or of skipping the service, is a shudder or groan on tight low-speed turns — the clutch packs chattering as they engage. Once that starts, fresh fluid does not always fix it.
Where this sits in A16: the “A” is a plain oil change, sub-item 1 adds the tire rotation, and sub-item 6 is the item above. Each is tracked separately by the Maintenance Minder, so A16 is a bundle of independent jobs that happened to come due together, not one procedure with a single price.
Honda A16 Service FAQ
What does the Honda A16 code actually include?
Reading it left to right: the “A” is an oil change, and each number after it is a separate job. For A16 that means a tire rotation, a rear differential fluid change. They arrive together because the Maintenance Minder counts each item down on its own schedule and shows you whatever has come due at the same time, which is why the same car shows different combinations at different points in its life.
How long can I leave the A16 service?
The oil portion is what has a real deadline. The wrench appears at 15% oil life, sharpens at 5%, and at 0% the display starts counting how far overdue you are. The rear differential fluid is the one to not let slide, because a neglected differential starts to shudder on tight turns and fresh fluid does not always cure it.
Can I do the Honda A16 service myself?
Partly, and it is worth splitting the job. The oil and the tire rotation are straightforward at home. The remaining fluid work needs the right Honda-specific fluid rather than a universal equivalent.
Is the A16 service covered by Honda Service Pass?
No. Honda Service Pass covers the basic A1 and B1 services — oil, filter, tire rotation and inspection — on 2025 and newer Hondas for one year or 12,000 miles. A16 includes work beyond that scope, so the extra items are chargeable even on a car still inside the term. Ask for an itemized invoice: the oil and rotation portion may still be covered while the rest is not.
Does A16 mean something is wrong with my Honda?
No. It is the maintenance schedule, not the diagnostics. A16 shows as a wrench symbol and simply means the algorithm has counted those items down to zero. A check engine light is a different system reporting a stored fault. If both are lit they are unrelated, and the check engine light is the one to investigate first.
How do I reset the A16 code?
Touchscreen cars: Settings, then Vehicle, then Maintenance Reset. Older models: hold the SEL/RESET button or trip stalk for around ten seconds with the ignition on. Reset only the items actually done — on multi-item codes like A16 you can reset individual sub-items, and clearing the whole code after doing only the oil will hide the jobs you still owe the car. Our Honda Maintenance Minder reset guide covers it model by model.