Powertrain, generic · Hybrid propulsion

P0A1E Starter/Generator Control Module

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

Mild and full hybrids often start the engine and recharge the battery with a belt-driven starter-generator that has its own control electronics. P0A1E means that controller has reported a fault or works incorrectly. Audi stores P0A1E00 in the starter-generator control module of the 2020-2022 Q3 mild hybrid and cures it with a software update. Ford logs P0A1E in the engine control module of 2021-2023 F-150 PowerBoost and 2020-2026 Explorer and 2020-2023 Aviator hybrids; its bulletins name a loose connection at the belt integrated starter-generator or its software. Drivers notice a wrench or MIL lamp, no start-stop and no electric-only driving.

Likely causes

Loose wiring connection at the starter-generator
Starter-generator software fault, fixed by update
Starter-generator with integrated electronics failed

Symptoms

  • Wrench lamp or MIL on, electrical system warning
  • Auto start-stop disabled
  • Electric-only driving unavailable

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–2,500
Time0.5–4 h

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

Parts involved

starter generator control module

Related codes

P0A1AP2D9BP0A94

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.