WenmarOpen by Wenmar Pro

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
A26-0092026-10-01. Service bulletin. ENGINE. Service Bulletin - Under certain conditions, the cylinder head gasket effectiveness may be reduced which may cause vehicles to experience overheating, coolant loss, and/or misfire. In some cases, DTCs P0300 through P0304 may also be stored (DTCs are not required for repair).
A26-0082026-10-01. Service bulletin. ENGINE. Service Bulletin - Under certain conditions, the cylinder head gasket effectiveness may be reduced which may cause vehicles to experience overheating, coolant loss, and/or misfire. In some cases, DTCs P0300 through P0304 may also be stored (DTCs are not required for repair).
AEBM082620269012026-08-27. Other. ENGINE. Dealer Message - Under certain conditions, the cylinder head gasket effectiveness may be reduced which may cause vehicles to experience overheating, coolant loss, misfire, and/or DTCs P0300 through P0304 stored.
A26-0092026-08-27. Service bulletin. ENGINE. Service Bulletin - Under certain conditions, the cylinder head gasket effectiveness may be reduced which may cause vehicles to experience overheating, coolant loss, misfire and/or DTCs P0300 thru P0304 stored.
A26-0082026-08-27. Service bulletin. ENGINE. Service Bulletin - Under certain conditions, the cylinder head gasket effectiveness may be reduced which may cause vehicles to experience overheating, coolant loss, misfire and/or DTCs P0300 thru P0304 stored.
A25-0762025-08-08. Service bulletin. ENGINE. Service Bulletin - Oil leak at timing chain tensioner inspection cover due to possible insufficient sealant adhesion on inspection cover.
A19-0332023-01-20. 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.
A19-0122023-01-20. Service bulletin. ENGINE AND ENGINE COOLING; VISIBILITY. Service Bulletin - This bulletin is replaced by S/B 19-033, Warranty Extension: 2016-18 Civic 1.5L: Software Update with A/C Control Unit Replacement; DTC P0300, P0301, P0302, P0303, P0304, or P0172; Whirling Noise from Engine.
SS10230062021-06-18. Service bulletin. ENGINE AND ENGINE COOLING. SS 1023006 Successful Regen Reference for EPA 07 MBE 900 Engines
APaS072120209022020-07-28. Service bulletin. ENGINE AND ENGINE COOLING. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2018-2019 Accords, 2016-2019 Civics & 2017-2019 CR-Vs with a customer complaint of an oil leak at the valve cover. 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.
APaS070620209022020-07-16. Service bulletin. ENGINE AND ENGINE COOLING; EQUIPMENT. Dealer Message - American Honda Motor Co., Inc. (AHM) is investigating certain 2018-2019 Accords, 2016-2019 Civics & 2017-2019 CR-Vs with a customer complaint of an oil leak at the valve cover. 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.
APaS062320202020-07-02. Service bulletin. ENGINE. Dealer Message - American Honda Motor Co., Inc. (AHM) is investigating certain 2018-2019 Accords, 2016-2019 Civics & 2017-2019 CR-Vs with a customer complaint of an oil leak at the valve cover. 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.
APaS061920209012020-06-25. Service bulletin. ENGINE AND ENGINE COOLING. Dealer Message - American Honda Motor Co., Inc. (AHM) is investigating certain 2018-2019 Accords, 2016-2019 Civics & 2017-2019 CR-Vs with a customer complaint of an oil leak at the valve cover. 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.
APaS052820202020-06-04. Service bulletin. VISIBILITY; ENGINE AND ENGINE COOLING; ENGINE. Dealer Message - We've noticed an unprecedented demand for A/C compressors which at times has created a backorder situation. The majority of the compressors returned were analyzed and proven leak free. As you are aware, there is Warranty Extension for Civic Condensers (Service Bulletin 19-091) for a leak problem. This bulletin provides detailed information on how to use the Bosch ROBLD020 Dual Mode Refrigerant Gas Leak Detector which should be used to confirm a leak at the compressor.
APaS041620209022020-05-05. Service bulletin. ENGINE AND ENGINE COOLING. Dealer message - American Honda Motor Co., Inc. (AHM) is investigating certain 2018-2019 Accords, 2016-2019 Civics & 2017-2019 CR-Vs with a customer complaint of an oil leak at the valve cover. 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.
APaS040720209062020-04-16. Service bulletin. ENGINE AND ENGINE COOLING. Dealer Message - American Honda Motor Co., Inc. (AHM) is investigating certain 2018-2019 Accords, 2016-2019 Civics & 2017-2019 CR-Vs with a customer complaint of an oil leak at the valve cover. 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.
APaS040320202020-04-10. Service bulletin. ENGINE; ENGINE AND ENGINE COOLING; VISIBILITY. Dealer Message - We've noticed an unprecedented demand for A/C compressors which at times has created a backorder situation. The majority of the compressors returned were analyzed and proven leak free. As you are aware, there is Warranty Extension for Civic Condensers (Service Bulletin 19-091) for a leak problem. This bulletin provides detailed information on how to use the Bosch ROBLD020 Dual Mode Refrigerant Gas Leak Detector which should be used to confirm a leak at the compressor.
APaS031920209062020-03-31. Service bulletin. ENGINE AND ENGINE COOLING. Dealer Message - American Honda Motor Co., Inc. (AHM) is investigating certain 2018-2019 Accords, 2016-2019 Civics & 2017-2019 CR-Vs with a customer complaint of an oil leak at the valve cover. 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.
ONL6DV021020202020-02-20. Service bulletin. ENGINE AND ENGINE COOLING. Followup Notice - Our records indicate that a PRODUCT UPDATE has not been completed on this vehicle; refer to the address card for the affected VIN. On 2016-18 Civic vehicles equipped with the 1.5 liter turbocharged engine, there are reports of vehicles experiencing drivability concerns. These concerns can result in the malfunction indicator lamp (MIL) turning on. If the MIL is illuminated, your vehicle may fail a state or local emissions inspection.
APaS020520209012020-02-11. Service bulletin. ENGINE AND ENGINE COOLING. Dealer Message - We've noticed an unprecedented demand for A/C compressors which at times has created a backorder situation. The majority of the compressors returned were analyzed and proven leak free. As you are aware, there is Warranty Extension for Civic Condensers (Service Bulletin 19-091) for a leak problem. This bulletin provides detailed information on how to use the Bosch ROBLD020 Dual Mode Refrigerant Gas Leak Detector which should be used to confirm a leak at the compressor.
A19-0382019-10-09. 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.
APaS081420199052019-08-20. 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.
APaS073020199012019-08-02. 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.
ONLE4C070820192019-07-23. Service bulletin. 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.
ONLD4D07082019_22019-07-23. Service bulletin. 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.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.