Powertrain, generic (extended)

P2ABC Wastegate Position Sensor B Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2ABC is the high-voltage fault on the wastegate B position sensor: according to Ford's 2020-23 gasoline summary the input sits above 4.50 V for 4 s, a picture typical of a signal line shorted to the reference supply or an open sensor ground. On the 2.7L F-150 of model years 2021-22 Ford blames false P2ABC entries on calibration and fixes them by reprogramming the PCM (TSB 22-2357); TSB 23-2353 and SSM 54083 add it for the 3.5L V6 in F-150 and Expedition/Navigator. Since the driver cannot tell a sensor fault from a sticking flap, both show up as lower power or a fault light. Heat and vibration at the turbine housing loosen terminals, so the actuator connector deserves the first look. P2ABB is the low side, P2AB9 the same fault on turbo A.

Likely causes

PCM calibration that sets the code falsely (Ford reflash for listed models)
Open sensor ground or heat-damaged terminal at the actuator
Signal wire shorted to the reference supply or battery voltage

Symptoms

  • Check engine light, on Ford possibly the wrench indicator
  • Reduced power under load

Repair estimate

DifficultyMediumDIY possible
Parts and labour€0–800
Time0.3–3 h

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

Parts involved

wastegate position sensor bwiring harnessecm

Related codes

P2ABAP2ABBP2AB9P2B82P2B94P0250

References: fordservicecontent.com, static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.