Powertrain, generic

P0E43 Hybrid/EV Powertrain Control Module B

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0E43 is the module-B counterpart of P0A1D: it reports that a second hybrid/EV powertrain controller has detected an internal failure or can no longer be trusted. Vehicles with two such processors, for example GM's Bolt EV with a second powertrain module labelled K114B (HPCM2), are where the letter B makes sense. No manufacturer documents P0E43 publicly. The A code shows what is meant: GM's 2013 hybrid tables store P0A1D when a status message from motor control processor A reports a controller failure in 3 of 4 counts, Type B, and Ford's 2019 hybrid summary uses P0A1D when the serial link between its processors fails, checked continuously. CARB requires the MIL for computer faults that impair OBD. Reprogramming or module replacement is likely; power may be limited.

Likely causes

Internal processor or memory fault in module B
Software fault curable by reprogramming
Supply, ground or internal bus fault at the module

Symptoms

  • MIL and hybrid or EV system warning
  • Reduced propulsion power or no ready mode

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 b

Related codes

P0A1DP0AC4U0293

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