Powertrain, generic · Fuel and air metering (injector circuit)

P0228 Throttle/Pedal Position Sensor/Switch C Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Sensor ground (low reference) open
Signal wire shorted to 5 V or system voltage
Sensor C or throttle body faulty
Connector corroded or water ingress
Engine module faulty

Symptoms

  • Check engine light (Ford also the wrench light)
  • Limp mode with limited power
  • Delayed or missing throttle response
  • Rough or raised idle

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–600
Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

throttle position sensor celectronic throttle bodysensor wiring

Related codes

P0225P0226P0227P0229P0223P2135

References: law.cornell.edu, fordservicecontent.com, en.wikipedia.org.