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

P0222 Throttle/Pedal Position Sensor/Switch B Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

With electronic throttle control the throttle body carries two position sensors, A and B, usually with opposite or offset signals, and the engine module compares them (correlation code P2135). GM and Ford give the pedal sensors their own codes (P2120 ff), so B is in practice the second throttle sensor. P0222 means the signal of sensor B is below its lower limit – GM about 0.25 V, Ford below 0.25 V – typically a short to ground, an open signal wire or a missing 5 V reference. Both detect it within about a second and switch the warning light on in the first trip. If the shared reference fails, several sensors report low at once. The module carries on with sensor A, limits throttle opening and power and switches off cruise control.

Likely causes

Signal or 5 V wire open or shorted to ground
Throttle body or sensor B faulty internally
5 V reference pulled down by another sensor
Connector corrosion or water ingress
Engine module faulty

Symptoms

  • Check engine light and throttle warning light
  • Reduced power, limp mode
  • Poor throttle response, jerking
  • Cruise control disabled

Repair estimate

DifficultyMediumDIY possible
Parts and labour€80–600
Time0.5–2 h

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

Parts involved

throttle position sensor belectronic throttle bodysensor wiring

Related codes

P0122P0220P0221P0223P2135P06A3

References: law.cornell.edu, gsi.ext.gm.com, newtonnet.co.uk, fordservicecontent.com.