Definitions: Honda owner's manuals, Maintenance Minder section (2016 and 2024 Civic, 2013 and 2018 Accord, 2017 CR-V, 2018 Odyssey, 2016 and 2021 Pilot). Manuals: 2024 Civic Hatchback Type R Owner's Manual, 2021 Pilot Owner's Manual. Your own manual decides which items apply to your engine and drivetrain.
B123 means four jobs are due together: B (replace the engine oil and oil filter, plus Honda's full inspection of brakes, steering, suspension, driveshaft boots, brake lines, fluid levels, exhaust and fuel lines), 1 (rotate the tires), 2 (replace the engine air filter and the cabin filter, and inspect the drive belt) and 3 (replace the transmission fluid). In short: everything in B12, plus transmission fluid.
Each piece has its own clock. The B and the 1 follow the oil life the Minder calculates. Honda prints no normal-driving mileage for the 2 (15,000 miles is its severe-duty figure for dusty or high-soot driving on the Civic, Accord and CR-V) or for the 3 (25,000 miles severe-duty for those models' CVTs; none for the Pilot). B123 shows up on the visit where all four line up, which is why it is priced closer to a major service than a routine one - even though every item is ordinary maintenance you can price line by line.
B123 is not B127. B127 swaps the transmission fluid for brake fluid; the two look alike on the dash but the last digit is a different job with a different cost, so check which number your car is actually showing.
Compared with A123, B123 adds the oil filter and the full inspection. Honda marks the exhaust and fuel line items in that inspection with a note pointing to the emissions warranty.
The "condition of fluids" line matters on this code. The transmission fluid is already being drained, so ask what the old fluid looked and smelled like, and what the brake and coolant reservoirs showed.
| Item | Comes from | DIY | Shop |
|---|---|---|---|
| Oil and filter (0W-20) | B | $40-$60 | $70-$130 |
| Inspection | B | Your own eyes and a checklist | Usually included in the B service |
| Tire rotation | 1 | Free with a jack | $20-$50 (often bundled) |
| Engine air filter | 2 | $15-$30 | $40-$70 |
| Cabin (dust and pollen) filter | 2 | $15-$30 | $40-$75 |
| Transmission fluid (drain and refill) | 3 | $50-$90 | $150-$250 |
| Typical all-in at a shop | $105-$180 total parts | $300-$500 |
Ranges, not quotes - parts pricing and shop labor vary by region and model year.
B123 has the widest cost spread of the common codes, so ask for a quote with one line per job rather than a bundle price. The filters follow Honda's condition footnotes (dusty air, sooty urban air) and the fluid follows the transmission type, so two B123 quotes for different cars can differ by more than this table suggests. The transmission fluid is most of what separates a B123 from a B12.
The split in the DIY section works out like this from the ranges above: about $70-$120 in parts for the oil, filter, rotation and both air filters, plus $150-$250 at a shop for the transmission fluid, comes to roughly $220-$370 against $300-$500 for a shop to do everything - a saving of about $80-$130, before the inspection.
The oil, filter, rotation and both air filters are standard driveway work - the same jobs as B12. Support the car on jack stands, never on the jack alone.
The transmission fluid needs the exact fluid your model specifies (table below) and the correct fill procedure, and the inspection is best done on a lift. A split that saves money: do the oil, filter, rotation and both filters yourself, and pay a shop for the transmission fluid and the inspection.
Honda prints no fixed mileage for sub-item 3 under normal driving on any of these models - the Maintenance Minder decides. The severe-duty column is the only mileage Honda gives, and only where the manual prints one. HCF-2 is CVT-only; it is not interchangeable with Honda ATF, and Honda's ATF types are not interchangeable with each other.
| Model | Years / transmission | Fluid Honda specifies | Honda severe-duty figure |
|---|---|---|---|
| Civic | 2006-2013, automatic | Honda ATF DW-1 (earlier manuals list ATF-Z1, which DW-1 replaces) | None printed in the manuals checked |
| Civic | 2014-2026, CVT | Honda CVT Fluid HCF-2 | Every 25,000 mi (mountainous or low-speed driving) |
| Civic | Manual transmission (Si, Type R and others) | Honda Manual Transmission Fluid (MTF) | Every 37,500 mi (2022 and newer manuals only) |
| Accord | 2008-2010, automatic | Honda ATF-Z1 | None printed |
| Accord | 2011-2012, automatic | Honda ATF DW-1 | None printed |
| Accord | 2013-2017, 4-cylinder CVT | Honda CVT Fluid HCF-2 | Every 25,000 mi (mountainous, low-speed or towing) |
| Accord | 2013-2017, V6 6-speed automatic | Honda ATF DW-1 | None printed |
| Accord | 2018-2026, 1.5T CVT | Honda CVT Fluid HCF-2 | Every 25,000 mi (mountainous or low-speed driving) |
| Accord | 2018-2022, 2.0T 10-speed automatic | Honda ATF-Type 2.0 | None printed |
| Accord | Hybrid (DW-1 through 2022, HEVF-Type 1 from 2023) | Honda ATF DW-1 / Honda HEVF-Type 1 | Every 47,500 mi or 3 years |
| CR-V | 2012-2014, 5-speed automatic | Honda ATF DW-1 | Only if towed behind a motorhome: every 2 years or 30,000 mi |
| CR-V | 2015-2026, CVT | Honda CVT Fluid HCF-2 | Every 25,000 mi (mountainous terrain or very low speeds; towing too on 2015-2022) |
| CR-V | Hybrid (DW-1 2020-2022, HEVF-Type 1 from 2023) | Honda ATF DW-1 / Honda HEVF-Type 1 | Every 47,500 mi or 3 years |
| Pilot | 2016-2020, 6-speed / 9-speed automatic | Honda ATF DW-1 (6-speed) or ATF-Type 3.1 or higher (9-speed) | None printed, normal or severe |
| Pilot | 2021-2022, 9-speed automatic | Honda ATF-Type 3.1 or higher | None printed, normal or severe |
| Pilot | 2023-2026, 10-speed automatic | Honda ATF-TYPE 2.0 | None printed, normal or severe |
| Odyssey | 2011-2017 | Honda ATF DW-1 | None printed, not even a severe-duty figure |
| Odyssey | 2018-2019 | Honda ATF-Type 3.1 or higher (9-speed: LX/EX/EX-L) or ATF-Type 2 (10-speed: Touring/Elite) | 9-speed trims only: first at 60,000 mi, then every 30,000 mi (mountainous, low-speed or towing) |
| Odyssey | 2020-2026, 10-speed automatic | Honda ATF-Type 2 | None printed |
Transfer fluid: the Pilot's owner's manuals list it under the 3 on all-wheel-drive (i-VTM4) models. The CR-V manuals list no transfer fluid item at all - on an AWD CR-V the rear differential fluid is a separate item, 6.
Source: each model year's Honda owner's manual (Maintenance Minder and Specifications sections), as recorded and cited in this site's per-year maintenance schedules.
No. B12 is the B service, a tire rotation and both air filters. B123 adds the transmission fluid change (the 3), which makes it the more expensive visit. If the display shows only B12, the transmission fluid is not due yet.
No. Both add one item to B12, but a different one - B123 adds transmission fluid (the 3), while B127 adds brake fluid (the 7). They cost differently and involve different fluids, so check which digit your dashboard is actually showing.
No. A123 has the same 1, 2 and 3 but an A instead of a B - no oil filter change and no full inspection. B123 adds both on top.
A B service, a tire rotation, both air filters and transmission fluid. On a 2015-or-newer CR-V that fluid is Honda HCF-2 CVT fluid (hybrid: ATF DW-1 for 2020-2022, HEVF-Type 1 from 2023). The CR-V manuals list no transfer fluid under the 3; the rear differential fluid on an AWD CR-V is item 6, so a CR-V showing B1236 has one more job due.
| Part | Fitment note | Buy |
|---|---|---|
| Mobil 1 Extended Performance 0W-20 Full Synthetic (5 qt) | Most 2012-and-newer Hondas spec 0W-20. Check the oil cap: roughly pre-2012 models call for 5W-20 instead. | Check price on Amazon |
| Honda Genuine 5W-20 Synthetic Blend motor oil | Only if your oil cap says 5W-20 (most 2006-2011 Civics, Accords, CR-Vs and the older V6s). | Check price on Amazon |
| Honda 94109-14000 drain plug crush washers (10-pack) | A new aluminum washer every drain. Reusing the old one is how drain plugs start seeping. Backup is a 20-pack (double the primary) - same washer, just more of them. | Check price on Amazon Compare Honda similar options on Amazon |
| Genuine Honda 15400-PLM-A02 oil filter | The one filter that fits nearly every Honda 4-cylinder and V6 since the mid-2000s; PLM-A02 supersedes PLM-A01. | Check price on Amazon Compare Honda oil filter on Amazon |
| Part | Fitment note | Buy |
|---|---|---|
| Click-type torque wrench, 1/2 in. drive | Honda lug nuts are 80 lb-ft on almost every model. A rotation needs nothing else beyond a jack and stands. | Check price on Amazon |
| Part | Fitment note | Buy |
|---|---|---|
| Honda Genuine engine air filter | Model- and engine-specific part number. Filter the results by your model and year before buying. | Check price on Amazon |
| Honda Genuine cabin air filter | Behind the glove box on most models. Also model-specific; a Civic filter does not fit a CR-V. | Check price on Amazon |
| Part | Fitment note | Buy |
|---|---|---|
| Genuine Honda HCF-2 CVT fluid (1 qt) | CVT models only: 2013+ Accord 4-cyl, 2014+ Civic, 2015+ CR-V and Fit, HR-V. A drain-and-fill takes about 4 qt. Never DW-1 in a CVT. Backups are 3- and 4-packs of the same fluid. | Check price on Amazon Compare Honda HCF-2 CVT fluid on Amazon |
| Honda Genuine DW-1 ATF (6 x 1 qt) | Conventional 5- and 6-speed automatics: 2006-2013 Civic, CR-V through 2014, Accord V6 through 2017, Odyssey and Pilot 6-speeds. About 3 qt per drain-and-fill. Backup is a 2-quart pack of the same fluid (smaller than the primary's 6-pack). | Check price on Amazon Compare Honda DW-1 automatic transmission fluid on Amazon |
| Honda ATF-Type 3.1 (1 qt) | The 9- and 10-speed automatics: 2018+ Accord 2.0T, Odyssey, Pilot, Passport, Ridgeline. Not interchangeable with DW-1. Backups are 2- and 3-packs of the same fluid. | Check price on Amazon Compare Honda Type 3.1 automatic transmission fluid on Amazon |
| Fluid transfer hand pump (for the fill plug) | The fill plug sits on the side of the case, above the drain. A pump with a hose is the only way to get fluid in from below. | Check price on Amazon |
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