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

P0220 Throttle/Pedal Position Sensor/Switch B Circuit

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. P0220 is the general circuit fault of sensor B without telling low from high. GM uses it in a special sense on 2015–2016 V8 engines: the signal lies outside 0.25–4.59 V only in the monitoring processor while the main processor sees it as valid; this sets immediately with the warning light. Newer GM and Ford engines report sensor B faults as P0222/P0223. The module carries on with sensor A, limits throttle opening and power and switches off cruise control.

Likely causes

Throttle body or sensor B faulty (worn track)
Wiring or connector at the throttle body (corrosion, break)
5 V reference disturbed (short in another sensor on the same reference)
Engine module input or monitoring processor 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

P0120P0221P0222P0223P0224P2135

References: law.cornell.edu, gsi.ext.gm.com, en.wikipedia.org.