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Home / DTC / U0320 — Software Incompatibility With Power Steering Control Module

U0320 — Software Incompatibility With Power Steering Control Module

Detailed page for trouble code U0320.

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22,491specific
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Code

U0320

Generic U — Network/User

Software Incompatibility With Power Steering Control Module

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

Causes

  • Mismatched or incorrect software/firmware version installed in PSCM
  • Interrupted or failed module reflash/update (corrupted firmware)
  • Replacement PSCM with incompatible calibration or part number
  • Incompatible software in other network modules expecting a different PSCM protocol
  • Module memory corruption or internal hardware failure affecting software integrity
  • Vehicle network (CAN) problems causing corrupted software version data to be reported

Symptoms

  • Power steering warning lamp or general warning lamp illuminated
  • Reduced or no electric power steering assist; heavy steering or limp-steer mode
  • Other modules showing related U-codes or CAN communication complaints
  • Steering torque anomalies, intermittent assist, or sudden loss of assist
  • Stored/comms faults in scan tool showing software version mismatch or invalid checksum

What to check

  • Read all current and historic DTCs and freeze frame with a capable scan tool (all modules)
  • Record software/firmware/calibration part numbers for PSCM and gateway/ECM from vehicle data
  • Check for related U-codes on gateway/ECM/ABS/cluster that indicate network incompatibility
  • Check battery voltage and charging system stability (low voltage can corrupt flashes)
  • Visually inspect PSCM connectors, wiring, and CAN bus terminations for damage, corrosion, or water ingress
  • Confirm vehicle OEM service bulletins/recalls or required calibration files for PSCM replacement

Signal parameters

  • PSCM software/firmware version string (SW part number)
  • PSCM calibration ID / hardware part number
  • Checksum or CRC value reported by module
  • CAN alive/heartbeat message interval (ms)
  • Message IDs used by PSCM (CAN Tx/Rx IDs) and presence/absence of those messages
  • Network error counters (CAN RX/TX error counts, bus-off state)

Diagnostic algorithm

  1. Obtain full vehicle scan and note all U-codes and related module status; save logged data
  2. Verify battery state-of-charge and charging system; ensure stable power during further tests
  3. Compare PSCM software/firmware and calibration IDs to OEM specifications and to gateway/ECM expected versions
  4. Inspect PSCM connectors and CAN bus wiring; repair any corrosion, damage, poor pin retention, or grounding issues
  5. If software versions mismatch or are corrupt, attempt a controlled reflash/update using OEM factory scan tool and correct calibration file while maintaining stable battery/charger
  6. After a successful reflash, clear codes, perform guided relearns or steering calibrations per OEM procedure, then road test
  7. If reflash fails or PSCM reports nonrecoverable memory faults, replace PSCM with correct OEM part and program/flash with the proper calibration
  8. If replacement module is used, verify all modules on the network have compatible software levels; update gateway/ECM if required
  9. If network errors persist after correct software, perform CAN bus diagnostics (shorts/opens, resistance, termination) and check other module behavior

Likely causes

  • Previous service reflash used wrong calibration file or incomplete update
  • Aftermarket or used PSCM installed with non-OEM software
  • Partial power loss during programming (battery low or ignition off) resulting in corrupted firmware
  • Network translator/gateway module software mismatch
  • Internal PSCM flash memory fault or nonrecoverable corruption

Fault status

⚠️ Status
U0320 — Software incompatibility detected in Power Steering Control Module; module reports invalid or unexpected firmware/calibration. May be stored or active depending on operation.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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Code

U0320

HYUNDAI U — Network/User

Software Incompatibility with Power Steering Control Module

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

Causes

  • Mismatched or incorrect software/firmware version installed in PSCM
  • Interrupted or failed module reflash/update (corrupted firmware)
  • Replacement PSCM with incompatible calibration or part number
  • Incompatible software in other network modules expecting a different PSCM protocol
  • Module memory corruption or internal hardware failure affecting software integrity
  • Vehicle network (CAN) problems causing corrupted software version data to be reported

Symptoms

  • Power steering warning lamp or general warning lamp illuminated
  • Reduced or no electric power steering assist; heavy steering or limp-steer mode
  • Other modules showing related U-codes or CAN communication complaints
  • Steering torque anomalies, intermittent assist, or sudden loss of assist
  • Stored/comms faults in scan tool showing software version mismatch or invalid checksum

What to check

  • Read all current and historic DTCs and freeze frame with a capable scan tool (all modules)
  • Record software/firmware/calibration part numbers for PSCM and gateway/ECM from vehicle data
  • Check for related U-codes on gateway/ECM/ABS/cluster that indicate network incompatibility
  • Check battery voltage and charging system stability (low voltage can corrupt flashes)
  • Visually inspect PSCM connectors, wiring, and CAN bus terminations for damage, corrosion, or water ingress
  • Confirm vehicle OEM service bulletins/recalls or required calibration files for PSCM replacement

Signal parameters

  • PSCM software/firmware version string (SW part number)
  • PSCM calibration ID / hardware part number
  • Checksum or CRC value reported by module
  • CAN alive/heartbeat message interval (ms)
  • Message IDs used by PSCM (CAN Tx/Rx IDs) and presence/absence of those messages
  • Network error counters (CAN RX/TX error counts, bus-off state)

Diagnostic algorithm

  1. Obtain full vehicle scan and note all U-codes and related module status; save logged data
  2. Verify battery state-of-charge and charging system; ensure stable power during further tests
  3. Compare PSCM software/firmware and calibration IDs to OEM specifications and to gateway/ECM expected versions
  4. Inspect PSCM connectors and CAN bus wiring; repair any corrosion, damage, poor pin retention, or grounding issues
  5. If software versions mismatch or are corrupt, attempt a controlled reflash/update using OEM factory scan tool and correct calibration file while maintaining stable battery/charger
  6. After a successful reflash, clear codes, perform guided relearns or steering calibrations per OEM procedure, then road test
  7. If reflash fails or PSCM reports nonrecoverable memory faults, replace PSCM with correct OEM part and program/flash with the proper calibration
  8. If replacement module is used, verify all modules on the network have compatible software levels; update gateway/ECM if required
  9. If network errors persist after correct software, perform CAN bus diagnostics (shorts/opens, resistance, termination) and check other module behavior

Likely causes

  • Previous service reflash used wrong calibration file or incomplete update
  • Aftermarket or used PSCM installed with non-OEM software
  • Partial power loss during programming (battery low or ignition off) resulting in corrupted firmware
  • Network translator/gateway module software mismatch
  • Internal PSCM flash memory fault or nonrecoverable corruption

Fault status

⚠️ Status
U0320 — Software incompatibility detected in Power Steering Control Module; module reports invalid or unexpected firmware/calibration. May be stored or active depending on operation.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0100 U0121 U0155 U0289 U0401
371

Browse 371 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HYUNDAI

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