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Home / DTC / U0423 — Invalid Data Received From Instrument Panel Control Module

U0423 — Invalid Data Received From Instrument Panel Control Module

Detailed page for trouble code U0423.

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U0423

HYUNDAI U — Network/User

Invalid Data Received From Instrument Panel Control Module

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

Causes

  • Corrupted or out-of-spec CAN bus messages from the IPC
  • Intermittent or failed IPC (instrument cluster) hardware or software
  • Faulty wiring, connectors, or poor ground related to the IPC/CAN bus
  • Bus voltage problems (short to battery/ground, high resistance, missing termination)
  • Software/calibration mismatch after module replacement or update
  • Other module sending malformed data (address claim/conflict)

Symptoms

  • MIL/CEL or other network-related warning lamps illuminated
  • Incorrect or intermittent gauge, indicator, or cluster displays
  • Loss or delay of information on cluster (speed, warning messages, warnings)
  • Multiple network communication DTCs present (U-codes or C-codes)
  • Possible drivability issues if other control modules rely on the IPC data

What to check

  • Scan all modules and record all stored/active DTCs and freeze frame data
  • Verify battery voltage and charging system before diagnosing network faults
  • Inspect IPC connectors and harness for corrosion, bent pins, or damage
  • Check CAN bus continuity and resistance across CAN_H and CAN_L (with power off)
  • Use a scope or high-speed CAN tool to monitor CAN_H/CAN_L waveforms for noise, reflections or missing termination
  • Confirm IPC software part number and calibration match vehicle build and VIN

Signal parameters

  • CAN bus differential idle approx. 2.5 V (each line ~2.5 V relative to ground)
  • Dominant/recessive differential voltage typical ~1.5–3.5 V when active (depends on vehicle)
  • Expected periodic message intervals from IPC: commonly tens to hundreds of milliseconds (varies by signal)
  • Message IDs and payloads for IPC are manufacturer-specific — verify with OEM wiring/data
  • Bus termination: ~60 ohms total between CAN_H and CAN_L (two 120 Ω resistors in parallel)

Diagnostic algorithm

  1. Record all DTCs from all modules and capture freeze frame / data stream. Note when U0423 sets (startup, driving, after accessory cycle).
  2. Verify battery voltage (12.4–12.8 V at rest) and charging system. Low voltage can corrupt module communication.
  3. Visually inspect IPC connector and adjacent harness for damage, corrosion, or loose pins. Repair any physical issues.
  4. With ignition ON, monitor CAN bus with a scan tool/OEM tool for IPC messages and any bus errors. Note missing or malformed frames.
  5. Use an oscilloscope to check CAN_H and CAN_L waveforms at the IPC connector: confirm proper recessive/dominant levels, clean edges, and no excessive noise or reflections.
  6. Check CAN bus resistance across CAN_H and CAN_L with ignition off. Expect approx. 60 Ω. Isolate segments if resistance is incorrect to find short/open.
  7. If wiring and bus look good, verify IPC software calibration/part number against OEM records. Reflash or program correct software if mismatched.
  8. If suspected IPC hardware fault (intermittent or no valid messages despite proper wiring and software), confirm by swapping with known-good IPC or following OEM module bench/test procedures.
  9. After repairs, clear codes and perform a functional test/road test while monitoring network data to confirm U0423 does not return.
  10. If other modules report errors or another module is identified as sending invalid data, troubleshoot that module per the same network and module-specific checks.

Likely causes

  • Loose/corroded connector at the IPC or junction harness causing corrupted messages
  • IPC software/calibration does not match vehicle (module replaced or incorrect reflash)
  • Open/short on CAN_H or CAN_L causing message corruption or dropouts
  • Failing IPC hardware (intermittent processor or transceiver fault)
  • Ground or battery voltage issues affecting IPC operation

Fault status

⚠️ Status
Invalid data received from Instrument Panel Control Module — indicates corrupted or unexpected CAN network data from the IPC. Check IPC connections, CAN bus integrity, and module software/calibration before replacing components.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

U0100 U0121 U0415 U0416 U0421
371

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