Have you ever seen a strange code like A1237 appear on your Honda’s dashboard and wondered what it means? You’re definitely not alone. Many drivers are caught off guard by these maintenance alerts.
Rather than being just a jumble of letters and numbers, the Honda A1237 code is your car’s way of letting you know it’s time for scheduled service. It’s a built-in reminder designed to help you stay on top of essential maintenance and avoid bigger issues down the road.
What is the Honda A1237 Service Code
The Honda maintenance minder code sheet above lists all the main and sub service items with A1237 highlighted.
The Honda A1237 maintenance code is an oil change, tire rotation service, engine and cabin air filter replacement, drive belt inspection, transmission fluid replacement, transfer fluid replacement (if equipped), and brake fluid replacement.
The “A” stands for an oil change, the “1” stands for a tire rotation, the “2” stands for an engine and cabin filter replacement with drive belt inspection, the”3″ stands for a transmission fluid replacement and transfer fluid replacement, and the “7” stands for brake fluid replacement.
The A1237 service is similar to the A123 service but it adds brake fluid replacement. It is typically performed by a Honda dealership or with a local mechanic.
Honda A1237 Service Cost
| Item | What it covers | Typical cost |
|---|---|---|
| “A” | Engine oil change | $50 – $100 |
| “1” | Tire rotation | $30 – $45 |
| “2” | Engine and cabin air filters, drive belt inspection | $100 – $150 |
| “3” | Transmission fluid (and transfer fluid on AWD) | $100 – $200 |
| “7” | Brake fluid | $80 – $130 |
| Total Honda A1237 service | $360 – $625 | |
The A1237 service typically costs $360 to $625. The cost will depend on the specific Honda vehicle you have and the labor cost rate.
For maintenance services like the A1237, most dealerships and 3rd party auto shops offer coupons and discounts. We suggest calling several locations beforehand to get the best deals.
Oil and Filter Change
The “A” in A1237 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
Tire Rotation
The “1” in A1237 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
Air Filter Replacement
The “2” in A1237 service is an engine and air filter replacement with a drive belt inspection and typically costs $100 to $150. The whole service takes about 45 minutes of labor time. However, we suggest calling your Honda dealership or 3rd party auto repair shop for exact quotes.
RepairPal also offers estimators for the engine and air filter replacement part of the “2” service:
Engine Air Filter Replacement Estimator
Cabin Air Filter Replacement
Transmission Fluid Replacement
The “3” in A1237 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. Only Hondas with 4WD or AWD will have a transfer case and need the fluid changed out.
RepairPal offers an estimator transmission fluid but not the transfer case fluid replacement portion of the “3” service:
Transmission Fluid Replacement Estimator
Brake Fluid Replacement
The “7” in A1237 service for Honda vehicles can cost $80 to $130 depending on your vehicle. However, we suggest calling your Honda dealership or 3rd party auto repair shop for exact quotes.
Honda A1237 DIY Cost
Want to save money or simply prefer to take charge of your Honda’s maintenance? Performing the A1237 service yourself is a smart way to cut costs—especially if you have the tools, time, and confidence to handle routine car care.
On average, a DIY A1237 service will cost between $150 and $250, depending on the type of motor oil, oil filter, air filters, and transmission fluid you choose. Premium full-synthetic oils or genuine Honda parts will be on the higher end, while high-quality aftermarket alternatives can help reduce your total spend.
While going the DIY route can save you on labor costs, it’s crucial to use the right parts and fluids to keep your Honda running at its best. We recommend using OEM Honda parts whenever possible, but reputable aftermarket brands such as Bosch, Mobil 1, Fram, K&N, and WIX are also solid options.
Oil Filter
Genuine Honda/Acura filters typically run $10–$15. Check the current price on Amazon.
Brake Fluid
Check your owner’s manual for whether your car takes DOT 3 or DOT 4. Check the current price on Amazon.
Be sure to consult your owner’s manual or call a local dealership to confirm the correct parts and fluid specifications for your exact model and year. Most of these items are readily available online or at your local auto parts store.
Taking on the A1237 service yourself is not only cost-effective but it also gives you a better understanding of your vehicle’s condition and helps you build confidence in basic car maintenance.
When Is the Honda A1237 Service Due?
The Maintenance Minder displays A1237 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
- 2 — Engine & cabin air filter replacement, drive belt inspection: ~30,000 mi
- 3 — Transmission fluid + transfer case fluid (if equipped): ~90,000 mi
- 7 — Brake fluid replacement: Every 3 years
That is why the code changes over time: an A1 becomes A1237 once those additional items fall due in the same visit.
Honda Models That Show the A1237 Code
The A1237 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 — and AWD or SH-AWD models add transfer case fluid to sub-item 3. Always confirm the specification your engine requires in the owner’s manual.
Related Honda Service Codes
- Honda A123 — the same service without brake fluid replacement
- Honda B1237 — the same items, but with an oil filter change and full multi-point inspection
- All Honda Maintenance Minder codes — the full reference table
Brake Fluid: The One Part of A1237 That Ignores Your Mileage
Sub-item 7 is a brake fluid replacement, and it is the odd one out in A1237 because it runs on a calendar rather than an odometer. Honda calls for brake fluid every three years regardless of mileage. A car that covers 4,000 miles a year needs it on exactly the same schedule as one covering 20,000.
The reason is that brake fluid is hygroscopic: it absorbs moisture from the air through the hoses and reservoir over time. Water lowers the boiling point, and fluid that boils under hard or sustained braking turns to vapor, which compresses. That is the long, soft pedal people describe coming down a mountain pass. It is also why the service is not optional on a low-mileage car.
Honda specifies DOT 3, and the job is a proper bleed at all four corners until clean fluid runs through, not a reservoir top-up. Old fluid is visibly darker than new. If a shop quotes A1237 and the price looks light, it is worth confirming the brake fluid line is actually a flush.
Where this sits in A1237: the “A” is a plain oil change, sub-items 1, 2 and 3 add the tire rotation, the filter work, the transmission fluid, and sub-item 7 is the item described above. Each is tracked separately by the Maintenance Minder, so A1237 is a bundle of independent jobs that happened to come due together, not one procedure with a single price.
Honda A1237 Service FAQ
What does the Honda A1237 code actually include?
Reading it left to right: the “A” is an oil change, and each number after it is a separate job. For A1237 that means a tire rotation, engine and cabin air filters with a drive belt inspection, a transmission fluid change, a brake fluid replacement. 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 A1237 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 brake fluid in A1237 is the item people wrongly treat as flexible: it is on a three-year clock and a low-mileage car is not exempt.
Can I do the Honda A1237 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 A1237 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. A1237 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 A1237 mean something is wrong with my Honda?
No. It is the maintenance schedule, not the diagnostics. A1237 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 A1237 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 A1237 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.