Code
U0505
Generic
U — Network/User
Invalid Data Received From Door Control Module F
AI status
Completed
Completed
100%
Causes
- Faulty Door Control Module F (internal failure or software fault)
- Open, shorted, or intermittent wiring/connectors at the door module
- CAN/LIN bus fault (short to battery/ground, missing termination, high resistance)
- Poor battery/low supply voltage or intermittent power to the module
- Corroded or water-damaged door harness or connector
- Incompatible or incomplete module programming/software mismatch
Symptoms
- Malfunctioning door functions (locks, power windows, mirror adjustment, courtesy lights)
- Central locking or remote lock/unlock inconsistent or nonfunctional
- Door-related warnings or messages on the instrument cluster
- Intermittent or permanent diagnostic trouble code stored (U0505) with related U-codes
- Loss of diagnostic communication with Door Control Module F via scan tool
- Unresponsive interior/exterior door switches for the affected door
What to check
- Use a capable scan tool to read U0505 and related codes; capture freeze frame and live data
- Attempt to communicate directly with Door Control Module F; note 'no response' or corrupted data
- Check battery voltage and health; verify stable 12V supply during testing
- Visually inspect door harness, connector and module for corrosion, damage or water intrusion
- Wiggle test wiring in the door jamb while watching for communication/errors
- Measure CAN_H and CAN_L (or LIN) voltages at the module with key on, engine off
Signal parameters
- CAN bus recessive voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (each); dominant approx. CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V
- Typical CAN differential (dominant) ≈ 2.0 V
- Typical bus termination ≈ 60 ohms (two 120 ohm resistors in parallel)
- Common CAN data rates: 500 kbps or 250 kbps (verify vehicle-specific bus speed)
- Door module should transmit periodic status frames; absence or corrupted payload indicates fault
Diagnostic algorithm
- Document symptoms and stored codes. Note when the fault occurs (after rain, after door flexing, at startup, etc.).
- Check vehicle battery voltage; recharge or load-test battery if low. Retry communication.
- With a scan tool, attempt to communicate with Door Control Module F. If no communication, record exact failure.
- Inspect the door harness, connector, and module for corrosion, bent pins, water, or physical damage. Repair as needed.
- Perform wiggle test on door harness while monitoring module communication and DTCs. Isolate intermittent wiring.
- Backprobe CAN_H and CAN_L at the door module connector; verify recessive voltages and that signals toggle when doors operate.
- Measure resistance across CAN_H and CAN_L with power off; expect ~60 ohms. Check for shorts to battery or ground on each line.
- Compare signals at the door module and at the gateway/BCM to determine whether fault is local to door or on the network wiring.
- If wiring and voltages are good, verify module software/calibration level against manufacturer data; reflash or reprogram if required.
- If all wiring and programming are correct but communication remains invalid, replace the door control module (follow immobilizer/anti-theft pairing procedures if applicable).
- After repairs, clear codes and perform functional tests and a road or operational test to confirm repair. Monitor for recurrence.
Likely causes
- Water intrusion/corrosion at the door harness connector causing intermittent communication
- Broken or pinched CAN/LIN conductors in the door jamb (repeated door flexing area)
- Failed door module due to internal component or flash memory fault
- Missing/incorrect software calibration after module replacement
- Fault at termination resistor or short between CAN_H and CAN_L
Fault status
Status
Invalid data received from Door Control Module F: messages from the module are corrupted, malformed, absent, or not recognized by the network gateway or receiving module.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Repair manuals
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Code
U0505
HYUNDAI
U — Network/User
Invalid Data Received From “Door Control Module F”
AI status
Completed
Completed
100%
Causes
- Faulty Door Control Module F (internal failure or software fault)
- Open, shorted, or intermittent wiring/connectors at the door module
- CAN/LIN bus fault (short to battery/ground, missing termination, high resistance)
- Poor battery/low supply voltage or intermittent power to the module
- Corroded or water-damaged door harness or connector
- Incompatible or incomplete module programming/software mismatch
Symptoms
- Malfunctioning door functions (locks, power windows, mirror adjustment, courtesy lights)
- Central locking or remote lock/unlock inconsistent or nonfunctional
- Door-related warnings or messages on the instrument cluster
- Intermittent or permanent diagnostic trouble code stored (U0505) with related U-codes
- Loss of diagnostic communication with Door Control Module F via scan tool
- Unresponsive interior/exterior door switches for the affected door
What to check
- Use a capable scan tool to read U0505 and related codes; capture freeze frame and live data
- Attempt to communicate directly with Door Control Module F; note 'no response' or corrupted data
- Check battery voltage and health; verify stable 12V supply during testing
- Visually inspect door harness, connector and module for corrosion, damage or water intrusion
- Wiggle test wiring in the door jamb while watching for communication/errors
- Measure CAN_H and CAN_L (or LIN) voltages at the module with key on, engine off
Signal parameters
- CAN bus recessive voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (each); dominant approx. CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V
- Typical CAN differential (dominant) ≈ 2.0 V
- Typical bus termination ≈ 60 ohms (two 120 ohm resistors in parallel)
- Common CAN data rates: 500 kbps or 250 kbps (verify vehicle-specific bus speed)
- Door module should transmit periodic status frames; absence or corrupted payload indicates fault
Diagnostic algorithm
- Document symptoms and stored codes. Note when the fault occurs (after rain, after door flexing, at startup, etc.).
- Check vehicle battery voltage; recharge or load-test battery if low. Retry communication.
- With a scan tool, attempt to communicate with Door Control Module F. If no communication, record exact failure.
- Inspect the door harness, connector, and module for corrosion, bent pins, water, or physical damage. Repair as needed.
- Perform wiggle test on door harness while monitoring module communication and DTCs. Isolate intermittent wiring.
- Backprobe CAN_H and CAN_L at the door module connector; verify recessive voltages and that signals toggle when doors operate.
- Measure resistance across CAN_H and CAN_L with power off; expect ~60 ohms. Check for shorts to battery or ground on each line.
- Compare signals at the door module and at the gateway/BCM to determine whether fault is local to door or on the network wiring.
- If wiring and voltages are good, verify module software/calibration level against manufacturer data; reflash or reprogram if required.
- If all wiring and programming are correct but communication remains invalid, replace the door control module (follow immobilizer/anti-theft pairing procedures if applicable).
- After repairs, clear codes and perform functional tests and a road or operational test to confirm repair. Monitor for recurrence.
Likely causes
- Water intrusion/corrosion at the door harness connector causing intermittent communication
- Broken or pinched CAN/LIN conductors in the door jamb (repeated door flexing area)
- Failed door module due to internal component or flash memory fault
- Missing/incorrect software calibration after module replacement
- Fault at termination resistor or short between CAN_H and CAN_L
Fault status
Status
Invalid data received from Door Control Module F: messages from the module are corrupted, malformed, absent, or not recognized by the network gateway or receiving module.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Repair manuals
Manual library for HYUNDAI
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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