P100C on the 2018 Honda Clarity
The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.
This code is specific to a manufacturer and is not described here. Its meaning is in the manufacturer's service information.
| A18-090 | 2023-11-29. Service bulletin. 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). There are up to three updates that must be performed on applicable vehicles. |
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| A18-090 | 2019-10-29. Service bulletin. 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). |
| ABOM10042018901 | 2018-10-15. Service bulletin. Dealer message - Today, American Honda is announcing several product updates a?ecting certain 2018 Honda Clarity Plug-In Hybrid (PHEV) models. There may be multiple combinations of these campaigns per VIN. To clearly identify each vehicle's needs, be sure to do an iN VIN status inquiry for units in dealer inventory and during customer visits. Also, to help ensure customer satisfaction and reduce inconvenience, make sure all parts and software are available when customers arrive. PROBLEM Climate Control: In certain operating conditions, a software issue with the climate control unit and PCM software may lead to incorrect operation of the coolant 3-way valve, causing DTC P26A3 (electric water valve malfunction) to set. Electric Valve Timing Control (EVTC): In certain operating conditions, an issue with the PCM software may lead to incorrect operation of the EVTC, causing DTC P100C (electric VTC motor signal circuit malfunction) and/or P0010 (variable valve timing control [VTC] malfunction) to set. Driver Information Interface: In certain EV mode driving conditions, a software issue with the driver information interface may lead to the HV range reading unusually high (more than 1,000 miles remaining). Warranty information CD placed in the vehicle did not list the correct warranty coverage for the state of Oregon. This may cause customer confusion regarding coverage. |
| A18-090 | 2018-10-15. Service bulletin. 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). |
| A18-079 | 2018-10-15. Service bulletin. Service bulletin - This bulletin is replaced by S/B 18-089, Product Update: 2018 Clarity Plug-In Hybrid EVTC & 3-Way Valve Software Update (P100C/P0010/P26A3) |
| A18-079 | 2018-08-06. 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). |
| A18-079 | 2018-07-30. 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). |
7 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.