Powertrain, generic (extended)

P2ABB Wastegate Position Sensor B Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2ABB reports that the position signal of the turbocharger B wastegate is too low, as a short to ground, a broken signal or supply wire or a failed sensor would cause. Ford's 2020-23 gasoline summary applies the same window as for turbo A and sets the code below 0.50 V after 4 s. In that document the threshold line for this sensor names sensor A, evidently an editing slip, since the heading and code title both refer to B. Ford lists P2ABB in TSB 23-2353 and SSM 54083 for twin-turbo applications such as the F-150 3.5L and Expedition/Navigator. The two GM tables reviewed here (2019 L3B, 2025) contain only the A codes. On a V6 the bank 2 flap can then no longer be positioned, so expect reduced boost and power. High is P2ABC, the bank 1 counterpart P2AB8.

Likely causes

Sensor wire chafed to ground near the bank 2 turbocharger
Open reference supply or signal wire, loose connector
Position sensor in wastegate actuator B failed

Symptoms

  • Check engine light
  • Less power, especially when accelerating hard

Repair estimate

DifficultyMediumDIY possible
Parts and labour€20–800
Time0.5–3 h

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

Parts involved

wastegate position sensor bwiring harnessecm

Related codes

P2ABAP2ABCP2AB8P2B82P0249P0651

References: fordservicecontent.com, static.nhtsa.gov, static.nhtsa.gov, law.cornell.edu.