Powertrain, generic · Hybrid propulsion

P0A1D Hybrid/EV Powertrain Control Module A

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

The hybrid powertrain control module coordinates engine, motors and battery. P0A1D says this module has reported an internal failure or is no longer working reliably. In GM hybrid tables (2013) the engine control module stores P0A1D when a message from motor control processor A signals a hybrid controller status failure in 3 of 4 counts, as a Type B code with MIL after two trips. GM 2016 tables list P0A1D among codes that limit engine power. Subaru warns for the 2014-16 Crosstrek Hybrid that generic OBD readouts may store P0A1D from a scan tool communication error; replace the module only if the code returns. P0E43 covers module B.

Likely causes

Internal fault of the hybrid control module
Code stored by a scan tool communication error, not by a real defect
Supply, ground or network fault at the module

Symptoms

  • MIL and hybrid warning on
  • Engine power reduced
  • Hybrid functions limited or unavailable

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–3,000
Time0.5–6 h

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

Parts involved

hybrid powertrain cm a

Related codes

P0E43P0AC4U0293P0A1BP0A1C

References: gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov.