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

P0227 Throttle/Pedal Position Sensor/Switch C Circuit Low

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. P0227 means the signal of sensor C is below its lower limit – on an analogue sensor a signal wire shorted to ground or an open signal or 5 V reference wire. 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

Signal wire of sensor C shorted to ground or open (chafing, connector)
5 V reference to the sensor open or loaded
Sensor C or second throttle body faulty
Corrosion or water in the throttle body connector
Engine module input 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

P0225P0226P0228P0229P0222P2135

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