U0504

Code

Generic U — Network/User

Invalid Data Received From Door Control Module E

Brand: Generic

Type: U — Network/User

Views: UK: 22 EN: 45 RU: 27

AI status

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Page language: EN

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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