Honda bulletin A23-042
What it saysA combination of carbon deposits on the intake valves and the PGM-FI software settings may lead to reduced combustion stability under certain circumstances. NHTSA’s full summary ↓
Honda filed this with NHTSA as a service bulletin dated Jun 2, 2023, received Jun 15, 2023, about the electrical system. It names 2 model years (2018–2019). 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 - A combination of carbon deposits on the intake valves and the PGM-FI software settings may lead to reduced combustion stability under certain circumstances. This results in a misfire being detected and DTC stored.
Trouble codes it names: P0300 P0301 P0302 P0303 P0304 all 5 read from the document itself; NHTSA’s summary names none
One of the 432 warranty extensions and special-coverage programs on file — every make, with the term each runs to.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| A23-042 | Service bulletin | Jun 2, 2023 | 10237807 | PDF, 4,160 KB |
What the document itself lists
The manufacturer titles it “Warranty Extension: 2018ꟷ19 Fit Carbon Buildup with Misfire DTCs”.
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 |
|---|---|---|
| 1255G2 | Update the PGM-FI software | 0.2 hrs |
| 1100B0 | 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 software for the 2019 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 2 model years this bulletin names have filed 255 complaints with NHTSA since 2015. 124 of them name Electrical 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.
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
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
I purchased a new Honda Fit in 2018. In November 2019, at 31,000 miles several indicator lights came on. The check engine, TPMS, Vehicle Stability assist, Electric Power System. The car was running smoothly but I was told by a Honda dealer there was excessive carbon build up. The cost to clean it out would be $500.
2018 Honda Fit · Engine · filed with NHTSA Aug 24, 2021 · ODI 11430269
In depth: 2019 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.
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 A23-042 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 A23-042 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 A23-042 cover?
The manufacturer filed it against 2 model years: 2019 Honda Fit, 2018 Honda Fit. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.