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Service bulletins for the 2018 Honda Civic

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.

236 on file from NHTSA, as of 2026-10-19.

By type

By component

By trouble code

Only bulletins with component: Engine are shown. Show all

Bulletins, newest first
ONLD4D07082019_12019-07-23. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER; ENGINE AND ENGINE COOLING. Owner Notification Letter - Some 2016-18 Civic vehicles equipped with the 1.5 liter turbocharged engine may experience driveability issues. This may result in Diagnostic Trouble Codes (DTCs) P0300 (random misfire detected), P0301 (No. 1 cylinder misfire detected), P0302 (No. 2 cylinder misfire detected), P0303 (No. 3 cylinder misfire detected), P0304 (No. 4 cylinder misfire detected), or P0172 (fuel system too rich) or a whirling noise coming from the engine compartment. These concerns may result in the Malfunction Indicator Lamp (MIL) turning on.
APaS070820199012019-07-22. Service bulletin. ENGINE AND ENGINE COOLING. Dealer Message - American Honda Motor Co., Inc. (AHM) is investigating certain 2018-2019 Civic 2.0Ls with a customer complaint of an oil leak. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to you attempting a repair of any kind.
APaS061920192019-06-25. Service bulletin. ENGINE AND ENGINE COOLING. Dealer Message - American Honda Motor Co., Inc. (AHM) is investigating certain 2018-2019 Civic 2.0Ls with a customer complaint of an oil leak. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to you attempting a repair of any kind.
A19-0382019-06-25. Service bulletin. ENGINE AND ENGINE COOLING. Service Bulletin - Under certain circumstances, the vehicle may experience driveability issues, which may result in DTCs P0300 (random misfire detected), P0301 (No. 1 cylinder misfire detected), P0302 (No. 2 cylinder misfire detected), P0303 (No. 3 cylinder misfire detected), P0304 (No. 4 cylinder misfire detected), or P0172 (fuel system too rich) or a whirling noise coming from the engine compartment.
A19-0332019-06-25. Service bulletin. ENGINE AND ENGINE COOLING. Service Bulletin - Under certain circumstances, the vehicle may experience driveability issues, which may result in DTCs P0300 (random misfire detected), P0301 (No. 1 cylinder misfire detected), P0302 (No. 2 cylinder misfire detected), P0303 (No. 3 cylinder misfire detected), P0304 (No. 4 cylinder misfire detected), or P0172 (fuel system too rich) or a whirling noise coming from the engine compartment.
APaS052420199012019-05-31. Service bulletin. ENGINE AND ENGINE COOLING. Dealer Message - American Honda Motor Co., Inc. (AHM) is investigating certain 2018-2019 Civic 2.0Ls with a customer complaint of an oil leak. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to you attempting a repair of any kind.
APaS050720199012019-05-15. Service bulletin. ENGINE AND ENGINE COOLING. Dealer Message - American Honda Motor Co., Inc. (AHM) is investigating certain 2018-2019 Civic 2.0Ls with a customer complaint of an oil leak. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to you attempting a repair of any kind.
ONL6DV050220192019-05-08. Service bulletin. ENGINE AND ENGINE COOLING. Owner Notification Letter - On 2016-18 Civic vehicles equipped with the 1.5 liter turbocharged engine, there are reports of vehicles experiencing driveability concerns. These concerns can result in the malfunction indicator lamp (MIL) turning on.
APaS041820199032019-04-23. Service bulletin. ENGINE AND ENGINE COOLING. Dealer Message - American Honda Motor Co., Inc. (AHM) is investigating certain 2018-2019 Civic 2.0Ls with a customer complaint of an oil leak. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to you attempting a repair of any kind.
APaS040220199042019-04-21. Service bulletin. ENGINE. Dealer Message - American Honda Motor Co., Inc. (AHM) is investigating certain 2018-2019 Civic 2.0Ls with a customer complaint of an oil leak. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to you attempting a repair of any kind.
ABOM040520192019-04-21. Service bulletin. POWER TRAIN; ENGINE. Dealer Message - Today, April 5, 2019, American Honda is announcing a warranty extension for certain 2016-18 Civic and 2017-18 CR-V vehicles due to drivability concerns. American Honda is extending the powertrain warranty on the camshafts and rocker arm assemblies from the original 5 years/60,000 miles to 6 years/unlimited miles from the original date of sale.
A19-0382019-04-21. Service bulletin. ENGINE. Service Bulletin - Under certain circumstances, the vehicle may experience driveability issues, which may result in DTCs P0300 (random misfire detected), P0301 (No. 1 cylinder misfire detected), P0302 (No. 2 cylinder misfire detected), P0303 (No. 3 cylinder misfire detected), P0304 (No. 4 cylinder misfire detected), or P0172 (fuel system too rich) or a whirling noise coming from the engine compartment.
APaS032020199032019-03-26. Service bulletin. ENGINE. Dealer Message - American Honda Motor Co., Inc. (AHM) is investigating certain 2018-2019 Civic 2.0Ls with a customer complaint of an oil leak. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to you attempting a repair of any kind.
AER19020B2019-03-05. Service bulletin. ENGINE. Engineering Request for Investigation - American Honda Motor Co., Inc. (AHM) is investigating certain 2018-2019 Civic 2.0Ls with a customer complaint of an oil leak. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to you attempting a repair of any kind.
APaS022520199032019-03-05. Service bulletin. ENGINE. Dealer Message - American Honda Motor Co., Inc. (AHM) is investigating certain 2018-2019 Civic 2.0Ls with a customer complaint of an oil leak. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to you attempting a repair of any kind.
A19-0122019-02-21. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING. Service Bulletin - Under certain circumstances, the vehicle may experience driveability issues which may result in DTCs P0300 (random misfire detected), P0301 (No. 1 cylinder misfire detected), P0302 (No. 2 cylinder misfire detected), P0303 (No. 3 cylinder misfire detected), P0304 (No. 4 cylinder misfire detected), or P0172 (fuel system too rich) or a whirling noise coming from the engine compartment.
A18-1372019-02-19. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING. "Service bulletin - Under certain circumstances, the vehicle may experience driveability issues which may result in DTCs P0300 (random misfire detected), P0301 (No. 1 cylinder misfire detected), P0302 (No. 2 cylinder misfire detected), P0303 (No. 3 cylinder misfire detected), P0304 (No. 4 cylinder misfire detected), or P0172 (fuel system too rich)."
ASO011120199012019-02-10. Service bulletin. ENGINE AND ENGINE COOLING. "Dealer message - American Honda issued four service bulletins addressing drivability concerns that may cause DTC’s to set in affected vehicles."
A18-1372019-02-10. Service bulletin. ENGINE AND ENGINE COOLING; EQUIPMENT:APPLIANCE:AIR CONDITIONER. "Service bulletin - Under certain circumstances, the vehicle may experience driveability issues which may result in DTCs P0300 (random misfire detected), P0301 (No. 1 cylinder misfire detected), P0302 (No. 2 cylinder misfire detected), P0303 (No. 3 cylinder misfire detected), P0304 (No. 4 cylinder misfire detected), or P0172 (fuel system too rich)."
APaS010220199012019-02-10. Service bulletin. ENGINE. Dealer message - American Honda (AHM) is investigating certain 2018 Accords & Civic Type-Rs with customer complaint of oil leak from the timing chain case cover. To fully understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to you attempting a repair of any kind.
AHPa122120189012019-01-05. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER; ENGINE; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). "Dealer message - On December 5, 2018, American Honda announced a product update campaign for certain 2017-18 CR-V vehicles with the 1.5L turbo engine that were sold in 21 cold-weather states. Today, American Honda is expanding the scope of this product update to include certain 2016-18 Civic vehicles with the 1.5L turbo engine. This applies to vehicles in the same 21 states. This product update also addresses concerns related to engine oil dilution due to various control unit software/threshold settings."
A18-137_V22019-01-05. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:APPLIANCE:AIR CONDITIONER; ENGINE AND ENGINE COOLING; ENGINE. "Service bulletin - Under certain circumstances, the vehicle may experience driveability issues which may result in DTCs P0300 (random misfire detected), P0301 (No. 1 cylinder misfire detected), P0302 (No. 2 cylinder misfire detected), P0303 (No. 3 cylinder misfire detected), P0304 (No. 4 cylinder misfire detected), or P0172 (fuel system too rich)."
A18-1372019-01-05. Service bulletin. ENGINE; EQUIPMENT:APPLIANCE:AIR CONDITIONER; ELECTRICAL SYSTEM:SOFTWARE. "Service bulletin - Under certain circumstances, the vehicle may experience driveability issues which may result in DTCs P0300 (random misfire detected), P0301 (No. 1 cylinder misfire detected), P0302 (No. 2 cylinder misfire detected), P0303 (No. 3 cylinder misfire detected), P0304 (No. 4 cylinder misfire detected), or P0172 (fuel system too rich)."
APaS112620189022018-12-07. Service bulletin. ENGINE. Dealer message - American Honda (AHM) is investigating certain 2018 Accords & Civic Type-Rs with customer complaint of oil leak from the timing chain case cover. To fully understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to you attempting a repair of any kind.
AER18100A2018-12-04. Service bulletin. ENGINE. Engineering request for investigation - American Honda (AHM) is investigating certain 2018 Accords & Civic Type-Rs with customer complaint of oil leak from the timing chain case cover. To fully understand the cause of this condition, AHM would like to collect specific parts from 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.