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P0A1D

Hybrid/EV Powertrain Control Module A

The hybrid/ev powertrain control module a reports a generic fault. Internal self-tests fail or response time outside calibration.

  • Check engine light: Yes
  • Emissions related: No
  • Repair difficulty: hard

Common causes

Ordered by how often each turns out to be the cause.

  • Internal module faultCommon
  • Communication degradedPossible

Parts involved

  • Hybrid Powertrain Cm A

P0A1D is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.