The B123 Honda maintenance code represents an oil and filter change, a vehicle inspection, tire rotation service, engine and cabin air filter replacement, drive belt inspection, transmission fluid replacement, and transfer fluid replacement (if equipped).
The “B” stands for an oil and filter change with vehicle inspection, the “1” stands for a tire rotation, the “2” stands for an engine and cabin filter replacement with drive belt inspection, and the”3″ stands for a transmission fluid replacement and transfer fluid replacement.
The B123 service is similar to the B12 service but it adds a transmission fluid replacement and transfer fluid replacement for AWD/4WD Honda vehicles. It is typically performed by a Honda dealership or with a local mechanic.
Honda B123 Service Cost
The Honda B123 service typically costs $320 to $575. The cost will depend on the specific Honda vehicle you have and the labor cost rate.
| Item | What it covers | Typical cost |
|---|---|---|
| “B” | Oil and filter change, plus multi-point inspection | $90 – $180 |
| “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 |
| Total Honda B123 service | $320 – $575 | |
For maintenance services like the B123, most dealerships and 3rd party auto shops offer coupons and discounts. We suggest calling several locations beforehand to get the best deals.
“B” Service Cost
The “B” service, an oil and filter change with a multi-point inspection, typically costs $90 to $180 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 offers a “B” service (oil change and inspection) cost estimate for your vehicle and location but it is separated into two estimators:
Oil Change Estimator: https://repairpal.com/estimator/oil-change-cost
Vehicle Inspection Estimator: https://repairpal.com/estimator/pre-purchase-car-inspection-cost
“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
“2” Service Cost
The “2” 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
“3” Service Cost
The “3” 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.
RepairPal offers an estimator transmission fluid but not the transfer case fluid replacement portion of the “3” service:
Transmission Fluid Replacement Estimator
Honda B123 DIY Cost
Want to save money or prefer to rely on yourself for your Honda’s maintenance? Performing a B123 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.
Honda B123 Maintenance Minder Description
The Honda maintenance minder code sheet above lists all the main and sub service items with B123 highlighted.
“B” Main Service Item
Honda describes the “B” service as an engine oil and filter change with a vehicle inspection. The parts included in the Honda vehicle inspection are:
- Front and rear brakes
- Tie rod ends, steering gearbox, and boots
- Suspension components
- Driveshaft boots
- Brake hoses and lines (including ABS/VSA)
- All fluid levels and condition of fluids
- Exhaust system
- Fuel lines and connections
“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.
“2” Sub Service Item
Honda describes the “2” service as an engine air filter replacement, cabin air filter replacement, and drive belt inspection.
“3” Sub Service Item
Honda describes the “3” service as a transmission fluid replacement and transfer case fluid replacement. Only Hondas with 4WD or AWD will have a transfer case and need the fluid changed out.
When Is the Honda B123 Service Due?
The Maintenance Minder displays B123 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
That is why the code changes over time: a B1 becomes B123 once those additional items fall due in the same visit.
Honda Models That Show the B123 Code
The B123 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 B12 — the same service without transmission fluid + transfer case fluid (if equipped)
- Honda A123 — the same items with an oil change only, no filter or inspection
- Honda B1237 — adds brake fluid replacement
- Acura B123 — the Acura equivalent of this code
- All Honda Maintenance Minder codes — the full reference table
Transmission Fluid in B123: Get the Specification Right
This is where B123 stops being routine. Sub-item 3 means a transmission fluid replacement, and on Honda the fluid is not interchangeable. Conventional automatics take Honda ATF DW-1. Continuously variable transmissions — fitted to most recent Civics, HR-Vs and many Accords — take Honda HCF-2, and the two are not substitutes for one another.
Putting DW-1 into a CVT, or a universal “works in all imports” fluid into either, is one of the more expensive mistakes available on these cars. CVTs are particularly unforgiving: the fluid is part of how the belt grips the pulleys, so the wrong friction characteristics show up as shudder and, eventually, as a transmission replacement.
If your Honda is all-wheel drive, B123 also covers the transfer unit, which is a separate drain and fill from the transmission itself. That is a second fluid and a second labor line on the invoice, so a quote that looks high against a front-wheel-drive car may be entirely correct.
Where this sits in B123: the “B” is an oil and filter change with the multi-point inspection, sub-items 1 and 2 add the tire rotation, the filter work, and sub-item 3 is the item described above. Each is tracked separately by the Maintenance Minder, so B123 is a bundle of independent jobs that happened to come due together, not one procedure with a single price.
Honda B123 Service FAQ
What does the Honda B123 code actually include?
Reading it left to right: the “B” is an oil and filter change with a multi-point inspection, and each number after it is a separate job. For B123 that means a tire rotation, engine and cabin air filters with a drive belt inspection, a transmission 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 B123 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 remaining items in B123 tolerate a few hundred miles of delay, but there is no benefit in stretching it.
Can I do the Honda B123 service myself?
Partly, and it is worth splitting the job. The oil and the tire rotation are straightforward at home. The transmission fluid needs the correct Honda specification and, on a CVT, is genuinely unforgiving of substitutes.
Is the B123 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. B123 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 B123 mean something is wrong with my Honda?
No. It is the maintenance schedule, not the diagnostics. B123 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 B123 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 B123 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.