Service bulletins for the 2018 Honda Fit
A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.
48 on file from NHTSA, as of 2026-10-19.
By type
By component
By trouble code
| ATI&05032024905 | 2024-05-15. Other. ENGINE. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2018 Fits with customer complaint of Check Engine Light (CEL) on with DTC P0420 [Catalyst System Efficiency Below Threshold] stored. To better understand the cause of this condition, AHM would like to inspect the vehicle prior to your attempting a repair of any kind. |
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| ATI&04152024902 | 2024-04-17. Service bulletin. ENGINE AND ENGINE COOLING. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2018 Fits with customer complaint of Check Engine Light (CEL) on with DTC P0420 [Catalyst System Efficiency Below Threshold] stored. To better understand the cause of this condition, AHM would like to inspect the vehicle prior to your attempting a repair of any kind. |
| ATI&03282024902 | 2024-04-02. Service bulletin. ENGINE AND ENGINE COOLING. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2018 Fits with customer complaint of Check Engine Light (CEL) on with DTC P0420 [Catalyst System Efficiency Below Threshold] stored. To better understand the cause of this condition, AHM would like to inspect the vehicle prior to your attempting a repair of any kind. |
| ATI&02152024905 | 2024-02-27. Service bulletin. ENGINE AND ENGINE COOLING. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017-2018 Fits with customer complaint of Check Engine Light (CEL) on with DTC P0420 (Catalyst System Efficiency Below Threshold) stored. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to your attempting a repair of any kind. |
| ATI&02012024904 | 2024-02-15. Service bulletin. ENGINE AND ENGINE COOLING; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CATALYTIC CONVERTOR. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017-2018 Fits with customer complaint of Check Engine Light (CEL) on with DTC P0420 (Catalyst System Efficiency Below Threshold) stored. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to your attempting a repair of any kind. |
| ATI&01172024905 | 2024-01-26. Service bulletin. ENGINE AND ENGINE COOLING. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017-2018 Fits with customer complaint of Check Engine Light (CEL) on with DTC P0420 (Catalyst System Efficiency Below Threshold) stored. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to your attempting a repair of any kind. |
| ATI&01022024909 | 2024-01-09. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CATALYTIC CONVERTOR; ENGINE AND ENGINE COOLING. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017-2018 Fits with customer complaint of Check Engine Light (CEL) on with DTC P0420 (Catalyst System Efficiency Below Threshold) stored. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to your attempting a repair of any kind. |
| ATI&11282023910 | 2023-12-08. Service bulletin. ENGINE AND ENGINE COOLING. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017-2018 Fits with customer complaint of Check Engine Light (CEL) on with DTC P0420 (Catalyst System Efficiency Below Threshold) stored. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to your attempting a repair of any kind. |
| ONL6M208142023 | 2023-08-18. Service bulletin. ENGINE AND ENGINE COOLING. Owner Notification Letter - On some 2018-2019 Fit vehicles, 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 Malfunction Indicator Lamp (MIL) being illuminated. |
| A23-042 | 2023-06-15. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; ENGINE AND ENGINE COOLING. Service 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. |
| A21-007 | 2023-06-15. Service bulletin. ENGINE AND ENGINE COOLING. Service Bulletin - The MIL comes on with DTC P0300 (random misfire detected) or P0301–P0304 (cylinder misfire detected) due to carbon buildup on the intake valves may be affecting combustion. |
| ABOM06022023906 | 2023-06-15. Service bulletin. ENGINE AND ENGINE COOLING. Dealer Message - American Honda is announcing a warranty extension for certain 2018-2019 Fit vehicles. American Honda is extending the warranty coverage for valve cleaning and software installation due to carbon buildup on the valves with misfire DTCs (P0300-P0304) on these vehicles to 10 years or 150,000 miles from the original date of purchase, whichever comes first. |
| A22010A | 2022-07-07. Service bulletin. FUEL SYSTEM, GASOLINE; ENGINE AND ENGINE COOLING; EQUIPMENT. "Service news article - When diagnosing a Fit within the above VIN range with a misfire complaint, start by doing service bulletin, 21-007 (Carbon Buildup with Misfire DTCs) instead of replacing fuel injectors. These vehicles use an improved injector design that addresses the failures that may have occurred in previous model years. In fact, fuel injectors within the above VIN range with misfire complaints were collected and found to have no defects that required part replacement. Replacing those injectors may have reduced the number of misfires temporarily, but most likely didn’t address the actual cause of the misfire. The recommended repair for these vehicles is to do the intake valve cleaning procedure described in service bulletin 21-007, (Carbon Buildup with Misfire DTCs)." |
| A21-007 | 2022-07-07. Service bulletin. FUEL SYSTEM, GASOLINE; FUEL SYSTEM, GASOLINE:STORAGE:EVAPORATIVE EMISSIONS:HOSES/VALVES/SENSORS; ELECTRICAL SYSTEM:SOFTWARE; ENGINE AND ENGINE COOLING; ENGINE AND ENGINE COOLING:ENGINE:OIL/LUBRICATION:SEALS/GASKETS. Service bulletin - The MIL comes on with DTC P0300 (random misfire detected) or P0301–P0304 (cylinder misfire detected). Carbon buildup on the intake valves may be affecting combustion. |
| A21-007 | 2022-02-22. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. Service Bulletin - The MIL comes on with DTC P0300 (random misfire detected) or P0301-P0304 (cylinder misfire detected). |
| A22010A | 2022-01-19. Service bulletin. ENGINE AND ENGINE COOLING; FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM. ServiceNews Article - When diagnosing a Fit within the above VIN range with a misfire complaint, start by doing service bulletin 21-007 (Carbon Buildup with Misfire DTCs) instead of replacing fuel injectors. These vehicles use an improved injector design that addresses the failures that may have occurred in previous model years. In fact, fuel injectors within the above VIN range with misfire complaints were collected and found to have no defects that required part replacement. Replacing those injectors may have reduced the number of misfires temporarily, but most likely didn't address the actual cause of the misfire. The recommended repair for these vehicles is to do the intake valve cleaning procedure described in service bulletin 21-007 (Carbon Buildup with Misfire DTCs). |
| A21-007 | 2021-12-22. Service bulletin. ENGINE AND ENGINE COOLING. Service Bulletin - The MIL comes on with DTC P0300 (random misfire detected) or P0301-P0304 (cylinder misfire detected). |
| A21-007 | 2021-06-22. Service bulletin. ENGINE AND ENGINE COOLING. Service Bulletin - The MIL comes on with DTC P0300 (random misfire detected) or P0301-P0304 (cylinder misfire detected). |
| APTD05242021 | 2021-06-04. Service bulletin. ENGINE AND ENGINE COOLING. Dealer Message - Released on April 30th, service bulletin 21-007 addresses random or single-cylinder misfire concerns on 2015-2020 Fit models. Part of the corrective action involves cleaning the intake ports of any carbon buildup using a media blaster (carbon cleaning tool). |
| A21-007 | 2021-05-25. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM:IGNITION; EQUIPMENT. Service Bulletin - The MIL comes on with DTC P0300 (random misfire detected) or P0301-P0304 (cylinder misfire detected). |
| A21-007 | 2021-05-05. Service bulletin. ENGINE AND ENGINE COOLING. Service Bulletin - The MIL comes on with DTC P0300 (random misfire detected) or P0301-P0304 (cylinder misfire detected). |
| A21010B | 2021-01-30. Service bulletin. ENGINE; FUEL SYSTEM, GASOLINE. "ServiceNews Article - If normal troubleshooting suggests replacing the fuel injectors, check the long-term fuel trim using the i-HDS to ensure that it's fixed right the first time. -If it is less than 1.0% (lean), then it's most likely caused by the injectors. -If it is more than 1.0% (rich), then it's most likely caused by carbon buildup on the valves. Use a commercially available valve cleaner to resolve the carbon issue." |
| A21-005 | 2021-01-30. Service bulletin. EQUIPMENT. Service Bulletin - The blower motor makes excessive noise, runs slowly, or intermittently stops working. |
| A07-030 | 2021-01-30. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. "Service Bulletin - There are several A/C leak detection tools available. -Refrigerant Gas Leak Detector -Ultrasonic Leak Detector -Leak Dye" |
| APaS02262020 | 2020-03-03. Service bulletin. ENGINE AND ENGINE COOLING. Dealer Message - American Honda Motor Co., Inc. (AHM) is investigating certain 2017-2019 Fits with a customer complaint of the MIL on with the misfire DTCs stored. To better understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.