What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
P1F77sub hydrogen tank temperature sensor malfunctionManufacturer communications
2Original wording in English
HONDA
Reported code forms P1F77
"Service bulletin - The vehicle may incorrectly set DTC P1F76 (main hydrogen tank temperature sensor malfunction) or P1F77 (sub hydrogen tank temperature sensor malfunction). The fuel cell communication control (IR)…
HONDA
Reported code forms P1F77
Tech line summary article - A temperature sensor failure in the main hydrogen tank or sub hydrogen tank may cause DTC P1F76 (main hydrogen tank temperature sensor malfunction) or P1F77 (sub hydrogen tank temperature…
Check vehicle applicability
2A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Honda | CLARITY FUEL CELL | 2018 |
| Honda | CLARITY FUEL CELL | 2017 |
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.