Code
U0504
Generic
U — Network/User
Invalid Data Received From Door Control Module E
Views:
UK: 17
EN: 27
RU: 22
AI status
Completed
Completed
100%
Causes
- Faulty Door Control Module (Module E)
- CAN bus wiring fault (open, short to power/ground, high resistance)
- Poor/loose connector or corrosion at the door-module connector
- Damaged or corroded module ground or power supply (low voltage, intermittent)
- Faulty CAN transceiver on the door module
- Incorrect or incompatible replacement module (not programmed or wrong calibration)
Symptoms
- Door-specific functions fail or act erratically (power locks, power windows, mirror fold, courtesy lights)
- Door ajar / door open indications or chime on dash when door is closed
- Intermittent or permanent loss of features for the affected door(s)
- Other modules report communication-related DTCs or multiple U-codes on the same CAN network
- Unable to communicate with Door Control Module using diagnostic tool or incorrect/garbled data displayed
What to check
- Scan all modules with a capable diagnostic tool and store all U-codes and related DTCs (check for other U05xx and U01xx codes)
- Identify which physical door corresponds to “Module E” from wiring diagram/service manual
- Check for Technical Service Bulletins (TSBs) or software updates for the door module or body control systems
- Visually inspect door harness, connectors and module for corrosion, water intrusion, physical damage, or repairs
- Verify battery voltage and module supply at the module connector (key on, engine off and cranking if required)
- Check module grounds for tightness and corrosion; measure voltage drop while exercising door functions
Signal parameters
- CAN bus: CAN_H ~2.5V (recessive ~2.5V, dominant ~3.5V), CAN_L ~2.5V (dominant ~1.5V); verify differential waveform looks normal
- Typical update rate for door module status messages: 5–20 Hz (varies by manufacturer)
- Message identifiers: manufacturer-specific IDs for door status (ID varies by vehicle); payload commonly contains: lock/unlock bit, latch/ajar bit, window position byte, switch input bits, diagnostic/status byte
- Power supply to module: nominal 9–16 V (verify no undervoltage during operation)
- Expected response to diagnostic request: module address present on bus and responds to functional and/or physical requests with valid PID/parameter bytes
Diagnostic algorithm
- Record freeze frame, current and pending codes from all modules using a capable scan tool; note module addressing and any U-codes present
- Confirm which door is 'Module E' using service documentation or by checking module addresses on the network
- Visually inspect door wire harness, connectors and module for damage, water, corrosion, or crushed wiring at hinge points
- Check fuses and power feed to the door control module; measure battery voltage at module connector with key ON
- Verify ground integrity: remove paint from grounding point if required and measure voltage drop while exercising door functions
- Using a scan tool, attempt to communicate with the door module; if no response, try waking the module (open/close door, cycle ignition) and re-attempt
- Backprobe CAN_H and CAN_L at the door module connector; verify idle voltages and differential using a multimeter and oscilloscope; look for noise, frequent error frames, or stuck-dominant state
- If CAN signals are abnormal, isolate the short by disconnecting sections or connectors in the door harness and re-check bus integrity and message presence
- If CAN signals look normal but data values are invalid, check for software/calibration mismatch — confirm module part number and software level; reprogram/update as required per OEM instructions
- If wiring and bus look correct and module still reports invalid data or does not respond, substitute a known-good, correctly programmed door control module (or bench test if available) to verify module failure before replacement
- After repair or replacement, clear DTCs, exercise affected functions, and re-scan to confirm no recurrence; road test and verify proper operation and network stability
Likely causes
- Intermittent/low battery voltage or poor ground at door control module
- Bent/missing/misaligned pins at door harness connector causing intermittent CAN comms
- Failed CAN transceiver inside the door module
- Module software mismatch after replacement or reflash error
- Short to battery or ground on CAN High or CAN Low in the door harness (usually near a hinge area)
Fault status
Status
Invalid data received from Door Control Module E — communication or data integrity fault with the door module (out-of-range, corrupted, or missing CAN messages).
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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Code
U0504
HYUNDAI
U — Network/User
Invalid Data Received From “Door Control Module E”
Views:
UK: 13
EN: 24
RU: 16
AI status
Completed
Completed
100%
Causes
- Faulty Door Control Module (Module E)
- CAN bus wiring fault (open, short to power/ground, high resistance)
- Poor/loose connector or corrosion at the door-module connector
- Damaged or corroded module ground or power supply (low voltage, intermittent)
- Faulty CAN transceiver on the door module
- Incorrect or incompatible replacement module (not programmed or wrong calibration)
Symptoms
- Door-specific functions fail or act erratically (power locks, power windows, mirror fold, courtesy lights)
- Door ajar / door open indications or chime on dash when door is closed
- Intermittent or permanent loss of features for the affected door(s)
- Other modules report communication-related DTCs or multiple U-codes on the same CAN network
- Unable to communicate with Door Control Module using diagnostic tool or incorrect/garbled data displayed
What to check
- Scan all modules with a capable diagnostic tool and store all U-codes and related DTCs (check for other U05xx and U01xx codes)
- Identify which physical door corresponds to “Module E” from wiring diagram/service manual
- Check for Technical Service Bulletins (TSBs) or software updates for the door module or body control systems
- Visually inspect door harness, connectors and module for corrosion, water intrusion, physical damage, or repairs
- Verify battery voltage and module supply at the module connector (key on, engine off and cranking if required)
- Check module grounds for tightness and corrosion; measure voltage drop while exercising door functions
Signal parameters
- CAN bus: CAN_H ~2.5V (recessive ~2.5V, dominant ~3.5V), CAN_L ~2.5V (dominant ~1.5V); verify differential waveform looks normal
- Typical update rate for door module status messages: 5–20 Hz (varies by manufacturer)
- Message identifiers: manufacturer-specific IDs for door status (ID varies by vehicle); payload commonly contains: lock/unlock bit, latch/ajar bit, window position byte, switch input bits, diagnostic/status byte
- Power supply to module: nominal 9–16 V (verify no undervoltage during operation)
- Expected response to diagnostic request: module address present on bus and responds to functional and/or physical requests with valid PID/parameter bytes
Diagnostic algorithm
- Record freeze frame, current and pending codes from all modules using a capable scan tool; note module addressing and any U-codes present
- Confirm which door is 'Module E' using service documentation or by checking module addresses on the network
- Visually inspect door wire harness, connectors and module for damage, water, corrosion, or crushed wiring at hinge points
- Check fuses and power feed to the door control module; measure battery voltage at module connector with key ON
- Verify ground integrity: remove paint from grounding point if required and measure voltage drop while exercising door functions
- Using a scan tool, attempt to communicate with the door module; if no response, try waking the module (open/close door, cycle ignition) and re-attempt
- Backprobe CAN_H and CAN_L at the door module connector; verify idle voltages and differential using a multimeter and oscilloscope; look for noise, frequent error frames, or stuck-dominant state
- If CAN signals are abnormal, isolate the short by disconnecting sections or connectors in the door harness and re-check bus integrity and message presence
- If CAN signals look normal but data values are invalid, check for software/calibration mismatch — confirm module part number and software level; reprogram/update as required per OEM instructions
- If wiring and bus look correct and module still reports invalid data or does not respond, substitute a known-good, correctly programmed door control module (or bench test if available) to verify module failure before replacement
- After repair or replacement, clear DTCs, exercise affected functions, and re-scan to confirm no recurrence; road test and verify proper operation and network stability
Likely causes
- Intermittent/low battery voltage or poor ground at door control module
- Bent/missing/misaligned pins at door harness connector causing intermittent CAN comms
- Failed CAN transceiver inside the door module
- Module software mismatch after replacement or reflash error
- Short to battery or ground on CAN High or CAN Low in the door harness (usually near a hinge area)
Fault status
Status
Invalid data received from Door Control Module E — communication or data integrity fault with the door module (out-of-range, corrupted, or missing CAN messages).
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
Similar codes
Your experience will help others
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Was this AI description helpful?
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