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U0594 Invalid Data Received From Hybrid/EV Powertrain Control Module

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

The hybrid or EV powertrain controller coordinates engine, motors and battery, so many modules read its messages. Ford's hybrid OBD summary explains that the ABS module logs U0594 when wheel-torque or driver-demand signals from the HPCM are flagged invalid, unknown or faulted; Ford's 2014 list carries it with MIL and its 2024 summary sets U0594_48 for bad monitoring data with MIL and wrench lamp. GM's 2023 brake tables expect serial data 31 from the module and set U0594, Type B, after 20 consecutive wrong authentication codes or a frozen alive counter. FCA names it implausible data from the HCP: on the 2020–21 Ram 1500 eTorque a poorly seated motor-generator connector led to stalling and a new MGU. Ford also found harmless U0594 entries in the Escape cluster and Lightning heat pump valve module.

Likely causes

Fault inside the hybrid system makes the controller mark its signals invalid (e.g. MGU connector on Ram eTorque)
Software of the hybrid controller or the receiving module out of date
CAN wiring or termination disturbed

Symptoms

  • Check engine light and hybrid or electrical system warning
  • Reduced power or stalling on some hybrids
  • Stored code without symptoms (Ford Escape, F-150 Lightning)

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–2,000
Time0.5–3 h

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

Parts involved

hev ev powertrain module

Related codes

U0293U0401U0415U059B

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