Code
U0418
Generic
U — Network/User
Invalid Data Received From Brake System Control Module A
Views:
UK: 59
EN: 37
RU: 77
AI status
Completed
Completed
100%
Causes
- Corrupted or malformed CAN/LIN messages from Brake System Control Module A
- Poor power or ground to the brake module causing transmission errors
- Damaged wiring or connectors on the vehicle network (CAN high/low) or module harness
- Faulty Brake System Control Module A (internal software or hardware fault)
- Module software mismatch after updates or replacement
- Interference on the vehicle bus or excessive bus load
Symptoms
- Illuminated ABS warning lamp and/or traction control light
- Possible reduced-function braking mode or ABS disabled message
- Loss or sporadic operation of ABS/traction/stability control features
- Other modules logging related U-codes or communication faults
- Possible inconsistent wheel speed or brake pressure values on scan tool
What to check
- Read and record current freeze frame and all stored DTCs from all modules
- Check for other U-codes indicating broader network issues (U0100, U0121, etc.)
- Visually inspect ABS module connector and wiring for corrosion, damage or loose pins
- Verify battery voltage and good chassis and engine grounds; check at ABS module pins under load
- Use a capable scan tool to monitor raw CAN messages from Brake System Control Module A and related messages
- Perform wiggle test on harness while monitoring network for intermittent errors (vehicle secure and parked)
Signal parameters
- CAN message types: wheel speed, brake pressure, ABS status, slip flags (typically periodic broadcast messages)
- Typical update rate: wheel speed and ABS event messages: 10–100 Hz (varies by manufacturer)
- Expected value ranges: wheel speed 0–300 km/h (or 0–188 mph), brake pressure within sensor-specific range; flags should be boolean/bit fields
- Message integrity: correct CAN ID, DLC (data length), and checksum/CRC where used
- Look for malformed frames (incorrect DLC), frequent error frames, or repeated single CAN ID corruption
Diagnostic algorithm
- Connect OEM-level scan tool and read all modules; note all communication-related DTCs and freeze frame data
- Check vehicle battery state-of-charge and charging system; ensure battery above minimum operating voltage for diagnostics
- Visually inspect ABS module connector and wiring; repair any corrosion, bent pins or damaged insulation
- With ignition ON and scan tool connected, monitor raw CAN messages from Brake System Control Module A and adjacent modules; note missing, malformed, or inconsistent messages
- If messages are missing or corrupted, isolate: check CAN continuity, resistance between CAN High and Low, and to ground; look for shorts to battery/ground
- Perform wiggle test of harness and connectors while monitoring network for changes to replicate intermittent faults
- If wiring and power/ground are good but invalid data persists, try reflashing or updating module software to correct calibration mismatch (follow OEM procedures)
- If reflashing fails and diagnostics point to the module, consider replacement of Brake System Control Module A and follow manufacturer programming/initialization procedures
- After repairs clear codes and perform a controlled road test verifying ABS, traction control, and that the U0418 code does not return; re-check for related codes
Likely causes
- Intermittent CAN bus open/short, high resistance, or loose connector at brake module
- Low battery voltage or poor ground at the ABS module during communication
- Failed ABS module network transceiver or internal memory corruption
- Aftermarket device or recent module replacement with incompatible software/calibration
- Corroded pins or water ingress in ABS connector causing bit errors
Fault status
Status
Invalid data received from Brake System Control Module A: module messages failed plausibility/integrity checks or were malformed on vehicle network.
Repair difficulty: Medium
Diagnostic time: 0.5-3.0 hours
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Code
U0418
HYUNDAI
U — Network/User
Invalid Data Received From Brake System Control Module
Views:
UK: 42
EN: 57
RU: 71
AI status
Completed
Completed
100%
Causes
- Corrupted or malformed CAN/LIN messages from Brake System Control Module A
- Poor power or ground to the brake module causing transmission errors
- Damaged wiring or connectors on the vehicle network (CAN high/low) or module harness
- Faulty Brake System Control Module A (internal software or hardware fault)
- Module software mismatch after updates or replacement
- Interference on the vehicle bus or excessive bus load
Symptoms
- Illuminated ABS warning lamp and/or traction control light
- Possible reduced-function braking mode or ABS disabled message
- Loss or sporadic operation of ABS/traction/stability control features
- Other modules logging related U-codes or communication faults
- Possible inconsistent wheel speed or brake pressure values on scan tool
What to check
- Read and record current freeze frame and all stored DTCs from all modules
- Check for other U-codes indicating broader network issues (U0100, U0121, etc.)
- Visually inspect ABS module connector and wiring for corrosion, damage or loose pins
- Verify battery voltage and good chassis and engine grounds; check at ABS module pins under load
- Use a capable scan tool to monitor raw CAN messages from Brake System Control Module A and related messages
- Perform wiggle test on harness while monitoring network for intermittent errors (vehicle secure and parked)
Signal parameters
- CAN message types: wheel speed, brake pressure, ABS status, slip flags (typically periodic broadcast messages)
- Typical update rate: wheel speed and ABS event messages: 10–100 Hz (varies by manufacturer)
- Expected value ranges: wheel speed 0–300 km/h (or 0–188 mph), brake pressure within sensor-specific range; flags should be boolean/bit fields
- Message integrity: correct CAN ID, DLC (data length), and checksum/CRC where used
- Look for malformed frames (incorrect DLC), frequent error frames, or repeated single CAN ID corruption
Diagnostic algorithm
- Connect OEM-level scan tool and read all modules; note all communication-related DTCs and freeze frame data
- Check vehicle battery state-of-charge and charging system; ensure battery above minimum operating voltage for diagnostics
- Visually inspect ABS module connector and wiring; repair any corrosion, bent pins or damaged insulation
- With ignition ON and scan tool connected, monitor raw CAN messages from Brake System Control Module A and adjacent modules; note missing, malformed, or inconsistent messages
- If messages are missing or corrupted, isolate: check CAN continuity, resistance between CAN High and Low, and to ground; look for shorts to battery/ground
- Perform wiggle test of harness and connectors while monitoring network for changes to replicate intermittent faults
- If wiring and power/ground are good but invalid data persists, try reflashing or updating module software to correct calibration mismatch (follow OEM procedures)
- If reflashing fails and diagnostics point to the module, consider replacement of Brake System Control Module A and follow manufacturer programming/initialization procedures
- After repairs clear codes and perform a controlled road test verifying ABS, traction control, and that the U0418 code does not return; re-check for related codes
Likely causes
- Intermittent CAN bus open/short, high resistance, or loose connector at brake module
- Low battery voltage or poor ground at the ABS module during communication
- Failed ABS module network transceiver or internal memory corruption
- Aftermarket device or recent module replacement with incompatible software/calibration
- Corroded pins or water ingress in ABS connector causing bit errors
Fault status
Status
Invalid data received from Brake System Control Module A: module messages failed plausibility/integrity checks or were malformed on vehicle network.
Repair difficulty: Medium
Diagnostic time: 0.5-3.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email