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Home / DTC / U0424 — Invalid Data Received From HVAC Control Module

U0424 — Invalid Data Received From HVAC Control Module

Detailed page for trouble code U0424.

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Code

U0424

HYUNDAI U — Network/User

Invalid Data Received From HVAC Control Module

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

Causes

  • HVAC control module software fault or internal failure
  • Faulty HVAC module power or ground (blown fuse, poor ground, intermittent supply)
  • Damaged, corroded, or loose HVAC module connectors or wiring
  • CAN bus wiring short, open, or high resistance between HVAC module and network
  • Bus termination or wiring impedance problem (missing/failed termination resistors)
  • Interference or noise on the CAN network (short to power, high resistance, shielding damage)

Symptoms

  • HVAC functions intermittent or inoperative (fans, mode selection, temperature control)
  • Climate control display shows incorrect data or error messages
  • Warning or message on dash indicating HVAC or communication fault
  • Other modules may report network communication or invalid data DTCs
  • Certain HVAC-related functions work but some commands are not executed
  • Possible loss of related comfort features (seat heaters, A/C clutch request not seen)

What to check

  • Use a capable scan tool to read U0424 and any HVAC module-specific codes; note freeze frame and occurrence history
  • Check for other U-codes or module communication errors on the same CAN network
  • Visually inspect HVAC module connector, wiring, and nearby harness for damage, corrosion, or loose pins
  • Verify HVAC module power and ground circuits (voltage with key on and engine off where applicable) and correct any blown fuses
  • With ignition ON, measure CAN_H and CAN_L at the HVAC module connector and at several nodes on the same bus
  • Check CAN bus termination resistance between CAN_H and CAN_L with power off (approx. 60 ohms for two 120Ω terminators in parallel)

Signal parameters

  • CAN_H idle voltage ≈ 2.5 V (measured with respect to chassis ground)
  • CAN_L idle voltage ≈ 2.5 V (both rails normally near 2.5 V when recessive)
  • Dominant state: CAN_H rises and CAN_L falls producing ~1.5–2.5 V differential during active bits (use scope for waveform)
  • Bus differential voltage during communication pulses ≈ 1.0–3.0 V depending on load and transceivers
  • Termination resistance (power off) ≈ 60 Ω across CAN_H and CAN_L for properly terminated two-node bus
  • HVAC module messages should appear at regular intervals; missing or malformed frames indicate source or bus problems

Diagnostic algorithm

  1. Connect a diagnostic scan tool with live data and record U0424 plus any other network-related codes and freeze-frame data. Clear codes and attempt to reproduce.
  2. Check for related U-codes on other modules to establish if issue is isolated to the HVAC node or affects the whole network.
  3. Visually inspect HVAC connector and harness for corrosion, bent pins, burns, or water intrusion. Repair any damage found.
  4. Verify HVAC module supply and ground circuits: check fuse(s), measure key-on voltage and ground continuity at the module connector.
  5. With ignition on, measure CAN_H and CAN_L at the HVAC connector and compare to a known-good node on the same bus. Use an oscilloscope to view waveforms if available.
  6. With vehicle power off, measure termination resistance across CAN_H and CAN_L at the HVAC connector. Expect ≈60 Ω; much higher or open indicates missing termination(s).
  7. If wiring and power/ground test good, disconnect the HVAC module and observe bus behavior—if bus returns to normal, the HVAC module may be faulty.
  8. If module suspected, check for available software updates or reprogramming procedures from dealer/OEM. Reflash or replace module only after confirming wiring and power are good.
  9. After repairs, clear DTCs and perform road or function test to verify fault does not return. If intermittent, perform extended monitoring and wiggle-testing of harness while observing network traffic.
  10. If diagnostics exceed shop capability (complex network faults or module programming required), consult dealer or qualified technician with Hyundai OEM tools.

Likely causes

  • HVAC module lost programming or corrupted firmware after service or battery disconnect
  • Water intrusion or corrosion at HVAC connector or wiring harness
  • Blown fuse or poor chassis ground at HVAC control module
  • CAN_H or CAN_L damaged at a splice or connector near HVAC unit
  • Recent module replacement without proper reprogramming or configuration

Fault status

⚠️ Status
Invalid/garbled CAN data received from HVAC control module. Verify HVAC module power/ground, connector and wiring integrity, CAN_H/CAN_L voltages/waveforms, termination, and module programming.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0401 U0415 U0416 U0419 U0100
371

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