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Home / DTC / U0422 — Invalid Data Received From Body Control Module

U0422 — Invalid Data Received From Body Control Module

Detailed page for trouble code U0422.

34,909codes
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22,984specific
All codes P-codes (Powertrain) B-codes (Body) C-codes (Chassis) U-codes (Network/User) Tesla Alerts
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Code

U0422

HYUNDAI U — Network/User

Invalid Data Received From Body Control Module

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

Causes

  • Faulty Body Control Module (BCM) sending incorrect or corrupted messages
  • CAN or LIN bus wiring damage, short, open, or high resistance
  • Poor or corroded connectors at the BCM or other modules
  • Low or unstable battery voltage / poor power or ground to BCM
  • Incorrect or mismatched BCM software/calibration (software version or coding mismatch)
  • Aftermarket accessories or modules causing message conflicts or bus loading

Symptoms

  • Malfunction Indicator Lamp (MIL) or communication warning displayed
  • Multiple modules report communication or invalid data faults
  • Intermittent or permanent loss of features controlled by BCM (locks, lights, wipers, interior functions)
  • Instrument cluster warnings or incorrect instrument/indicator behavior
  • Remote keyless entry, alarms, or convenience features fail or behave erratically
  • Other control modules set related U-codes

What to check

  • Read freeze frame and full DTC list with a capable scan tool; note time/date and occurrence count
  • Check for other network-related U-codes and module-specific codes to identify affected systems
  • Inspect BCM connector(s) for corrosion, bent pins, or water intrusion
  • Verify battery voltage (should be within nominal range) and test BCM power and ground circuits
  • Visually inspect CAN/LIN wiring harness for chafing, pinches, or repairs near BCM and common routing
  • Measure CAN bus idle voltages with a multimeter (approx. 2.5 V on both CAN_H and CAN_L relative to ground)

Signal parameters

  • CAN_H idle voltage ≈ 2.5–3.5 V, CAN_L idle voltage ≈ 0.5–2.5 V (dominant/recessive waveform expected)
  • Bus differential idle approximately 0 V (recessive) with nominal differential pulses when active
  • Message IDs originating from BCM (manufacturer-specific) and expected periodicity; look for missing or corrupted frames
  • Message cycle time and timeout thresholds (e.g., module expected to transmit every X ms)
  • Error counters: CAN controller transmit/receive error counts and bus-off status
  • CRC/checksum or sequence counters on BCM messages (if applicable) showing mismatch

Diagnostic algorithm

  1. Verify and record symptoms. Use a scan tool to capture U0422 details, related U-codes, freeze frame, and occurrence count.
  2. Clear codes and attempt to reproduce. Note whether the code returns immediately, intermittently, or after specific events (ignition cycle, door open, accessory usage).
  3. Check battery state of charge and all BCM power and ground pins for proper voltage and low resistance to chassis ground.
  4. Visually inspect and reseat BCM connector(s). Repair any damaged pins or corroded terminals. Recheck for code presence.
  5. Inspect CAN/LIN wiring for physical damage along routing; repair any chafed or pinched sections. Check continuity and resistance where practical.
  6. Measure CAN_H and CAN_L with oscilloscope while reproducing the fault. Look for missing frames, dominant locking, excessive noise, or lack of expected differential signals.
  7. Check termination resistors across CAN_H and CAN_L (~60 ohms). Remove modules or isolate segments if needed to locate a shorted/failed node.
  8. Temporarily disconnect non-essential aftermarket modules or recently added devices to determine if they are injecting invalid data.
  9. If wiring and connections are good but invalid data continues, verify BCM software/coding. Reprogram or update BCM to the correct calibration per factory procedures.
  10. If software update does not resolve and testing points to BCM as source (consistent invalid frames from BCM), replace BCM only after confirming no wiring or network faults remain. Program new BCM with correct vehicle configuration.
  11. After repair or module replacement, clear codes, perform full system scans and verify normal network traffic and restoration of affected functions. Road test as required.

Likely causes

  • Corroded/loose BCM connectors or poor ground at BCM
  • CAN bus short between CAN_H and CAN_L or to battery/ground
  • BCM software mismatch after service (wrong calibration or missing reflash)
  • Failed BCM internal hardware or memory corruption
  • Aftermarket device (alarm, remote start) injecting invalid messages

Fault status

⚠️ Status
Invalid data received from Body Control Module — communication/data integrity problem on vehicle network (CAN/LIN)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0100 U0121 U0140 U0155 U0421
371

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

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