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Home / DTC / U0594 — Invalid Data Received From Hybrid Powertrain Control Module

U0594 — Invalid Data Received From Hybrid Powertrain Control Module

Detailed page for trouble code U0594.

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U0594

HYUNDAI U — Network/User

Invalid Data Received From Hybrid Powertrain Control Module

Brand: HYUNDAI
Type: U — Network/User
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty or intermittent CAN/LIN communication between hybrid powertrain control module and other controllers
  • Corroded, loose, or damaged connector or wiring to the hybrid powertrain control module
  • Failed or malfunctioning hybrid powertrain control module (HPCM/HPCU)
  • Low or unstable 12V supply or poor ground to the hybrid control module
  • Software or calibration mismatch between modules (missing update or incorrect reprogramming)
  • High-voltage battery pack or inverter providing invalid status data

Symptoms

  • MIL (check engine) and hybrid system warning lamp(s) illuminated
  • Loss of hybrid functions or reduced power / limp-home mode
  • Inability to charge or start in EV mode, altered regenerative braking
  • Multiple network/module communication DTCs present
  • Intermittent or permanent faults that may clear and reappear

What to check

  • Read and record all DTCs and freeze-frame data from all control modules (scan tool capable of hybrid network)
  • Check for related codes in gateway, ECM, ABS, BMS, inverter and body modules
  • Inspect hybrid powertrain control module connectors for corrosion, bent pins, water ingress and secure fit
  • Verify 12V battery voltage and dedicated fused supply to HPCM with ignition on and cranking
  • Check module ground(s) for low resistance to chassis
  • Perform CAN bus health checks: message presence, bus load, and termination (approx. 60 Ω across CAN H/L with ignition off using a multimeter)

Signal parameters

  • CAN message IDs carrying hybrid pack status (HV battery voltage, pack current, state-of-charge)
  • Inverter/ motor controller status and torque request messages
  • Hybrid system readiness / operational state flags (ready, fail-safe, sleep)
  • Accelerator pedal position, vehicle speed, brake input messages used by hybrid control
  • 12V supply and local module ground voltage measurements
  • Message frequency and data validity (expected periodic update rates vs. missing or malformed frames)

Diagnostic algorithm

  1. Safety first: follow manufacturer high-voltage safety procedures before accessing hybrid components. Disable HV system / isolate battery if required for wiring or module access.
  2. Connect a capable scan tool and retrieve all stored and pending DTCs and freeze-frame; note the occurrence pattern and other affected modules.
  3. Attempt to reproduce the fault by cycling ignition and operating the vehicle; observe which messages are missing or invalid on the scan tool (which parameters show "invalid" or "not received").
  4. Inspect connectors and wiring to the hybrid powertrain control module and gateway/ECM for corrosion, poor crimps, loose pins or water intrusion; repair any physical damage.
  5. Measure 12V supply and key-on voltages at the hybrid control module and verify proper ground resistance; repair if out of specification.
  6. Check CAN bus integrity: verify presence of expected CAN frames, use a scan tool or oscilloscope to confirm signal voltages and waveform quality; look for bus-off conditions or continuous errors.
  7. If CAN frames are missing or corrupted, isolate sections of the bus to identify faulty node or shorted wiring; disconnect suspect modules one at a time and re-check bus health.
  8. Verify HV battery and inverter status messages; if those modules report internal faults, diagnose them per their specific procedures (battery SOC sensor, current sensor, inverter faults).
  9. Check for and apply any relevant software updates or reprogramming procedures for the hybrid control module and gateway (follow manufacturer reflash steps).
  10. If wiring, power/ground and software are good but invalid data persists, consider replacing the hybrid powertrain control module or other identified faulty module—only after confirming with manufacturer diagnostics. Clear codes and perform a road test to confirm repair.
  11. Document findings and, if module replacement performed, ensure proper programming, module configuration, and retest all network functions.

Likely causes

  • Intermittent CAN bus wiring/connectors between hybrid control module and gateway/ECM
  • 12V supply or ground problem to the hybrid powertrain control module
  • HPCM internal fault or software corruption
  • HV battery current/voltage sensor fault feeding invalid data
  • CAN bus off condition or failing transceiver on module

Fault status

⚠️ Status
Invalid data or unexpected/malformed CAN messages received from Hybrid Powertrain Control Module (HPCM/HPCU); network message(s) out-of-range, corrupted, or missing.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1–6 hours

Similar codes

U0100 U0073 U0121 U0401 U0140
371

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