Honda bulletin A21-007
What it saysThe MIL comes on with DTC P0300 (random misfire detected) or P0301âP0304 (cylinder misfire detected) due to carbon buildup on the intake valves may be affecting combustion. NHTSA’s full summary ↓
Honda filed this with NHTSA as a service bulletin dated Jun 2, 2023, received May 5, 2021, about the engine — 7 documents under this number. It names 5 model years (2016–2020). A service bulletin is not a safety recall: it is the manufacturer telling its dealers how to diagnose or repair a condition, and whether the work is paid for depends on the warranty in force. Quoting the number at a service desk can save a diagnosis.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationService Bulletin - The MIL comes on with DTC P0300 (random misfire detected) or P0301âP0304 (cylinder misfire detected) due to carbon buildup on the intake valves may be affecting combustion.
Trouble codes it names: P0300 P0301 P0304 P0302 P0303 2 of 5 read from the document itself
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| A21-007 | Service bulletin | Jun 2, 2023 | 10237806 | PDF, 4,148 KB |
| A21-007 | Service bulletin | Jun 1, 2022 | 10215233 | PDF, 1,929 KB |
| A21-007 | Service bulletin | Feb 18, 2022 | 10208197 | PDF, 4,221 KB |
| A21-007 | Service bulletin | Dec 15, 2021 | 10205452 | PDF, 4,205 KB |
| A21-007 | Service bulletin | Jun 18, 2021 | 10198173 | PDF, 4,210 KB |
| A21-007 | Service bulletin | May 14, 2021 | 10194445 | PDF, 4,210 KB |
| A21-007 | Service bulletin | Apr 30, 2021 | 10191759 | PDF, 4,197 KB |
What the document itself lists
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 17105-5R0-004 | Intake Manifold Gasket | 4 | eBay Motors → |
| 17107-5R0-004 | Throttle Body Gasket | 1 | eBay Motors → |
| 17108-5R0-004 | EGR Port Gasket | 1 | eBay Motors → |
| 14711-5R7-A00 | — | — |
Labour operations and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 1255D8 | Update the PGM-FI software | 0.2 hrs |
| 1100A4 | Clean the intake ports of any carbon buildup. (Includes DTC clear) | 1.6 hrs |
Read by machine from the document NHTSA serves (14 pages), read Oct 4, 2026. A part number is shown only where it matches Honda’s own catalogue shape, an operation only with its code and time, and a description only where the reader got it whole; anything it could not settle is left out, and the PDF is the record. Times are the manufacturer’s warranty allowances, not a quote. Listings and prices on eBay Motors are the seller’s.
Affiliate disclosure: some links on this page are affiliate links. If you request a quote or buy through them we may earn a commission at no extra cost to you. Nothing on this page changes because of it.
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Doing the repair yourself, or pricing it before the shop does? Search the part by fitment on eBay Motors — the listing and the price are the seller’s.
Find the ignition for the 2020 Fit →Affiliate disclosure: some links on this page are affiliate links. If you request a quote or buy through them we may earn a commission at no extra cost to you. Nothing on this page changes because of it.
Model years it names
Source: as the manufacturer filed themA vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
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What owners reported
Source: NHTSA complaint databaseOwners of the 5 model years this bulletin names have filed 457 complaints with NHTSA since 2015. 372 of them name Electrical System, Fuel/Propulsion System, Engine — the same broad component group this bulletin is filed under. NHTSA groups complaints coarsely, so that means the same area of the vehicle, not necessarily the same fault.
On the 2016 Honda Fit, the 25 owners who gave an odometer reading for Electrical System reported it at a median of 43,500 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
10 August 2021 - Fuel pump fixed due to a recall. 19 October 2021 - digital gas/mileage went blank. Took my car to the dealership and they removed the fuel pump and put it back. Dealership said it was fixed. 21 October 2021 - digital/gas mileage issue again 22 October 2021- took it back to dealership. My car only has 19, 500 miles on it
2019 Honda Fit · Electrical System · filed with NHTSA Oct 22, 2021 · ODI 11437739
I need a new starter. I bought my 2016 Honda Fit used 5 months ago. It now has 43,900 miles. A 3 year old car with this mileage should not need to have the starter replaced. I tried 2-3 times to start my car but it wouldn't start. No clicking noise, no noise at all. I thought it was a dead battery and when jumped it started right away.
2016 Honda Fit · Electrical System · filed with NHTSA Feb 9, 2019 · ODI 11175939
While driving car the electrical system failed with all safety lights on dashboard turning on. When system goes off the ABS braking system, traction control, and power steering fails. Also noted engine misfiring. This happened when driving on freeway. I have brought car into Honda 2 times and they have not been able to figure it out.
2018 Honda Fit · Electrical System · filed with NHTSA Jun 4, 2021 · ODI 11419596
In depth: 2019 Honda Fit electrical problems → · 2019 Honda Fit fuel system problems → · 2016 Honda Fit electrical problems →
A complaint is one owner’s account, not a defect finding, and a bulletin is not a recall. Nothing here says this bulletin was issued because of these complaints, or that the repair it describes fixed them. Complaint files on this site begin in 2015.
More bulletins about the engine
Source: same model, same component group20 other manufacturer communications filed against the Honda Fit under the same component group (engine), newest first. The eight newest are listed; the rest are on the Honda list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| ATI&03072025901 | Other | Mar 8, 2025 | Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017 Fits with customer complaint of Check Engine Light (CEL)… |
| ATI&02212025901 | Other | Feb 22, 2025 | Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017 Fits with customer complaint of Check Engine Light (CEL)… |
| ATI&02072025901 | Other | Feb 8, 2025 | Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017 Fits with customer complaint of Check Engine Light (CEL)… |
| ATI&01082025901 | Other | Jan 9, 2025 | Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017 Fits with customer complaint of Check Engine Light (CEL)… |
| ATI&12022024909 | Other | Dec 3, 2024 | Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2018-2024 Accord 1.5Ls, 2021-2024 Civics 1.5Ls, 2023-2024 CR… |
| ATI&11052024902 | Other | Nov 5, 2024 | Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2018-2024 Accord 1.5Ls, 2021-2024 Civics 1.5Ls, 2023-2024 CR… |
| ATI&10232024907 | Other | Oct 23, 2024 | Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017 Fits with customer complaint of Check Engine Light (CEL)… |
| ATI&10022024908 | Other | Oct 2, 2024 | Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017 Fits with customer complaint of Check Engine Light (CEL)… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Honda, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Honda A21-007 a recall?
No. A service bulletin is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the A21-007 repair free?
Not automatically. A service bulletin describes how to diagnose or repair a condition; who pays depends on the warranty in force, any extension, and the dealer. Quoting the number can save a diagnosis either way. Every Honda warranty extension on file lists the ones Honda has filed.
Which vehicles does A21-007 cover?
The manufacturer filed it against 5 model years: 2020 Honda Fit, 2019 Honda Fit, 2018 Honda Fit, 2017 Honda Fit, 2016 Honda Fit. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.