P218C
Throttle/Fuel Inhibit B Circuit Range/Performance
Throttle/fuel inhibit B signal reads in range but plausibility fails — does not assert/release as expected.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Inhibit logic mismatchCommon
- Sensor element aged beyond calibration windowLess likely
- Sensor mounting loose - signal dampingLess likely
Parts involved
- Throttle Fuel Inhibit
P218C is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.