P0228Throttle/Pedal Position Sensor/Switch C Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Sensor C is a third throttle or pedal position signal; its role depends on the manufacturer. Ford uses it for the sensor of the second throttle body on engines with two throttles and digital (SENT) sensors, GM does not use it. P0228 means the signal of sensor C is above its upper limit – typically an open sensor ground, which pulls the signal up to the reference, or a signal wire shorted to voltage. The module discards sensor C and runs in limp mode with limited power. Ford reports low and high faults of its digital sensor C as U2111/U2112 instead, so no manufacturer using exactly this code was found; the description follows CARB's input monitoring requirement and the sensor A/B siblings.
- What you may notice
- Check engine light (Ford also the wrench light)
- Limp mode with limited power
- Delayed or missing throttle response
- Rough or raised idle
- Likely causes
- LikelySensor ground (low reference) open
- PossibleSignal wire shorted to 5 V or system voltage
- PossibleSensor C or throttle body faulty
- PossibleConnector corroded or water ingress
- RareEngine module faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €50 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.