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Home / DTC / U0418 — Invalid Data Received From Brake System Control Module

U0418 — Invalid Data Received From Brake System Control Module

Detailed page for trouble code U0418.

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U0418

HYUNDAI U — Network/User

Invalid Data Received From Brake System Control Module

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

Causes

  • Faulty Brake System Control Module (ABS/ESC) sending incorrect data
  • Intermittent or failed CAN-bus communication between modules
  • Poor power or ground to the brake module
  • Corroded/damaged connectors or wiring (short/open)
  • Incompatible or out-of-date module software/calibration
  • Other modules sending corrupted messages (bus loading/noise)

Symptoms

  • ABS, ESC or traction control warning lamp ON
  • Brake-related warnings or reduced brake assist (in some vehicles)
  • Intermittent or permanent diagnostic trouble code U0418 stored
  • Possible drivability complaints if other controllers act on bad data
  • Loss of some vehicle stability control functions

What to check

  • Read all stored and pending U- and B- codes from all modules; note freeze frame and ignition cycles
  • Check battery voltage and charging system (should be stable >12 V during cranking and >13.5 V running)
  • Inspect ABS/brake module connector for corrosion, bent pins, moisture, or damage
  • Visually inspect CAN trunk and branch wiring for chafe, pinch, or aftermarket splices
  • Scan for related communication codes (e.g., U0121, U0155) and verify which modules report errors
  • Measure CAN High/Low voltages at the ABS module connector with key ON and engine OFF/ON

Signal parameters

  • CAN bus idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (approx. symmetrical); dominant state shifts to roughly CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V
  • Typical SAE J2284/CAN data rates: 250 kb/s or 500 kb/s depending on model (verify OEM spec)
  • Message frequency: wheel speed messages typically 10–100 Hz; ABS control/status messages periodic/when event-driven
  • Expected valid payload ranges: wheel speed, brake pressure, yaw rate within manufacturer-specified limits (refer to OEM data)
  • Verify message IDs and CRC/checksum presence per OEM communication protocol

Diagnostic algorithm

  1. Retrieve codes from all modules and record freeze-frame data and the ignition cycle count associated with U0418.
  2. Check battery and charging system; ensure stable voltage. Re-test if low voltage was present during code set.
  3. Visually inspect ABS/brake module harness, connector seals, and pins for corrosion, water intrusion, or damage. Repair as needed.
  4. With a capable scan tool, monitor live CAN messages and the brake module data stream. Note missing messages, invalid values, or checksum errors.
  5. Measure CAN_H and CAN_L voltages at the brake module connector with key ON. Confirm idle and dominant voltages and continuity to other modules.
  6. Perform wiggle/road-test while monitoring live data to reproduce the fault and isolate a wiring or connector issue.
  7. If wiring and power/ground check good, check software/calibration versions of the brake module and other related controllers. Compare with OEM specs and TSBs.
  8. If module programming mismatch or known software fault, reflash or update module software per OEM procedure.
  9. If communication errors persist and wiring/power/software verified, consider replacement of the Brake System Control Module and follow OEM pairing/programming procedures.
  10. After repairs, clear codes and perform a verification drive cycle. Re-scan all modules to confirm the issue is resolved and no new U-codes appear.

Likely causes

  • Loose or corroded connector at the brake module
  • Damaged CAN high/low wiring, chafing, or pinched cable
  • ABS module internal failure or partial failure
  • Missing or incorrect module programming after replacement
  • Low system voltage or intermittent power/ground fault

Fault status

⚠️ Status
Invalid data received from Brake System Control Module — data on the vehicle CAN bus from the brake control module was out-of-range, corrupted, or communication was lost.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 4.0 hours

Similar codes

U0121 U0155 U0415 U0416 U0419
371

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