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Service bulletins for the 2018 Honda Clarity

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.

46 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
A21-0082021-02-18. Service bulletin. ELECTRICAL SYSTEM; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM); ENGINE AND ENGINE COOLING. Service Bulletin - The Hybrid System Failure message comes on the MID, and DTC P1D8D (Generator Motor Inverter Short) is stored.
A18-0902019-10-29. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM; VISIBILITY. Service Bulletin - There is a software problem in the PCM, which may cause the MIL to come on with DTC P26A3 (electric water valve malfunction), DTC P100C (electric VTC motor speed signal circuit malfunction) and/or P0010 (variable valve timing control [VTC] malfunction).
ONL6VT032620192019-04-06. Service bulletin. ENGINE AND ENGINE COOLING; VISIBILITY; POWER TRAIN. Owner Notification Letter - On Clarity Plug-in Hybrid vehicles, there may be a software problem in the powertrain control module (PCM), causing a malfunction indicator light to come on and store one or more diagnostic trouble codes (DTCs).
ONL6SV032620192019-04-06. Service bulletin. ENGINE AND ENGINE COOLING; VISIBILITY. Owner Notification Letter - On Clarity Plug-in Hybrid vehicles, there is a software problem in the climate control unit when running the heater, which may turn the malfunction indicator light on.
APaS120520189012018-12-14. Service bulletin. ENGINE AND ENGINE COOLING. "Dealer message - AHM is studying the current replacement need for the ION filter (PN 3H450-5WM-A01). We would like to collect several samples in the field for this study. A supply of bags and identifying labels will be sent to your dealership for this project."
A18110B2018-11-30. Service bulletin. ENGINE AND ENGINE COOLING. "ServiceNews Article - When replacing the fuel cell stack, make sure you bleed the air from the fuel cell insulating system exactly as called out in the fuel cell insulating fluid replacement procedure in the service information. If you don't, you'll get an FC Coolant Low. See Your Dealer message in the driver information interface shortly after your repair and/or will damage the new fuel cell stack."
A17070B2018-07-16. Service bulletin. ENGINE AND ENGINE COOLING. Servicenews article - The Clarity Fuel Cell vehicle has two very different cooling systems. One system cools the fuel cell system; the other one cools the inverter system. The fuel cell system uses a 50% coolant mixture called fuel cell insulating fluid, This fluid can't be mixed with any other fluid. Doing so cuts its insulating properties and will damage the fuel cell system.

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