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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: Electrical system are shown. Show all

Bulletins, newest first
A18-0692018-10-15. Service bulletin. ELECTRICAL SYSTEM. Service bulletin - This bulletin is replaced by S/B 18-091, Product Update: 2018 Clarity PHEV Driver Display Software Update (Mileage)
A18-0972018-10-15. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY. Service bulletin - The Clarity Plug-In Hybrid and Clarity Electric may not start charging when plugged in or may stop charging before the high-voltage lithium-ion battery is full. The battery charger software does not start charging or may stop before charging is complete in areas with poor or fluctuating power quality.
A18-0792018-08-06. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. Service bulletin - The MIL comes on with DTC P100C (electric VTC motor speed signal circuit malfunction) and/or P0010 (variable valve timing control [VTC] malfunction).
A18-0792018-07-30. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). Service bulletin - The MIL comes on with DTC P100C (electric VTC motor speed signal circuit malfunction) and/or P0010 (variable valve timing control [VTC] malfunction).
ATS 1805032018-07-16. Service bulletin. ELECTRICAL SYSTEM. Tech line summary article - We're getting reports of the HV range shown in the driver information interface reading unusually high (more than 1,000 miles remaining). How high it gets depends on driving style, and it typically happens after many EV trips not using the engine.
A18-0692018-07-02. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. Service bulletin - The HV range display reading is unusually high. There is a software error in the miles per gallon calculation, which affects the remaining HV range display.

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