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Service bulletin A18-079

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10143164
Published by NHTSA2018-07-30
Manufacturer's numberA18-079
Manufacturer's date2018-07-10
NHTSA componentELECTRICAL SYSTEM:SOFTWARE; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM)

NHTSA's summary

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).

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Electrical system, Transmission and driveline, Automatic transmission, Software, Transmission control module

Trouble codes named

P0010, P100C

Vehicles listed
HONDA CLARITY PLUG-IN HYBRID2018 (the catalog's model; the bulletin names a series or trim of it)

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
18V9210002018-12-20. ELECTRICAL SYSTEM:SOFTWARE; HYBRID PROPULSION SYSTEM

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
A21-0082021-02-18. Service bulletin. Service Bulletin - The Hybrid System Failure message comes on the MID, and DTC P1D8D (Generator Motor Inverter Short) is stored.
ONL6CK030520192019-03-15. Service bulletin. Owner Notification Letter - On 2017-18 Clarity Fuel Cell vehicles, the software that monitors the temperature in the fuel cell tank may not be up to date. This may cause the vehicle to incorrectly display a hydrogen system warning on the instrument panel and store a system malfunction.
A18-0892018-10-15. Service bulletin. Service bulletin - There is a software problem in the climate control unit when running the heater, which may turn the MIL on. There are up to three updates that must be performed on applicable vehicles. Check the iN VIN status inquiry for applicability.
A18-0792018-08-06. Service bulletin. 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).
A18-0692018-07-02. Service bulletin. 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.