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U0293 Lost Communication With Hybrid/EV Powertrain Control Module

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

The hybrid or EV powertrain control module coordinates engine, motors and high-voltage battery, so many controllers depend on its frames. Ford's 2019 hybrid OBD summary has the battery module set U0293 when HPCM messages are missing for 1 or 5 s, and the brake module set it because wheel torque data are lost; the 2014 list marks it with MIL. GM uses it in several units: the 2016 Volt VICM reacts after 500 ms as Type B, the 2018 L8B engine module after 0.5 s as Type A. Jeep cured it on the 2021 Wrangler 4xe with a TCM flash, Toyota found U029387 on the 2019–2020 RAV4 Hybrid in frost because the IGCT relay failed to power the HV ECU. Ford SSMs name connector grease and gateway software. Often the car will not start or drive.

Likely causes

Supply relay or fuse of the hybrid powertrain module (e.g. IGCT relay in frost)
Software in the hybrid module, gateway or receiving module
Connector fault, including grease applied to module connectors
CAN wiring to the hybrid module damaged
Hybrid/EV powertrain control module internally failed

Symptoms

  • Check engine lamp or hybrid system warning
  • Vehicle does not become ready or will not start
  • Stop safely now message, loss of power

Repair estimate

DifficultyHardWorkshop job
Parts and labour€0–3,000
Time0.3–6 h

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

Parts involved

hev ev powertrain modulevehicle bus wiring

Related codes

U0594U0100U0111U0110

References: fordservicecontent.com, gsi.ext.gm.com, gsi.ext.gm.com, performanceparts.ford.com.