Faulty door switch D (the switch itself may be stuck, corroded, or internally shorted).; Damaged or corroded wiring harness at the door hinge area, where flexing occurs.; Poor electrical connection at the door switch connector or body control module (BCM) connector.; Water intrusion into the door switch or connector causing intermittent shorts.; Failed body control module (BCM) or door control module that processes the switch signal.; Communication network issue (e.g., CAN bus) affecting data transmission from the door module.; Aftermarket accessories (e.g., alarm, remote start) improperly tapped into door switch wiring.

DTC codes / U05xx · Network communication / U0519

U0519Invalid Data Received From Door Switch D

Q: What does code U0519 mean?

Invalid Data Received From Door Switch D. U0519 is a communication fault indicating that a control module received invalid or missing data from the door switch D circuit, which typically monitors a specific door's open/closed status. The computer detected a message that did not match expected values or was absent when required, often due to a wiring issue, faulty switch, or network communication error.

U0519 is a communication fault indicating that a control module received invalid or missing data from the door switch D circuit, which typically monitors a specific door's open/closed status. The computer detected a message that did not match expected values or was absent when required, often due to a wiring issue, faulty switch, or network communication error.

SystemNetwork

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaNetwork communication

Symptoms you may notice

Illumination of the malfunction indicator lamp (MIL) or a body control module warning light.
Often no symptoms besides the warning light, as the vehicle may still operate normally.
Intermittent or persistent door ajar warnings on the dashboard, even when doors are closed.
Failure of interior lights, power locks, or keyless entry to respond correctly to that door.
Remote start or alarm system may not arm or disarm properly if the door status is misread.

Common causes, most likely first

Faulty door switch D (the switch itself may be stuck, corroded, or internally shorted).
Damaged or corroded wiring harness at the door hinge area, where flexing occurs.
Poor electrical connection at the door switch connector or body control module (BCM) connector.
Water intrusion into the door switch or connector causing intermittent shorts.
Failed body control module (BCM) or door control module that processes the switch signal.
Communication network issue (e.g., CAN bus) affecting data transmission from the door module.
Aftermarket accessories (e.g., alarm, remote start) improperly tapped into door switch wiring.

How to diagnose and fix it

Use a scan tool to read all codes and verify U0519 is current; clear the code and test-drive to see if it returns.
Visually inspect the door switch D and its wiring for obvious damage, corrosion, or loose connections.
Check the door switch operation with a multimeter: verify continuity changes when the door is opened and closed.
Inspect the wiring harness between the door and body for chafing or broken wires, especially at the hinge boot.
Test the communication bus for proper voltage and resistance if other modules also show communication codes.
If the switch and wiring are good, check for faulty BCM or door module by substituting with a known-good unit.
Repair or replace the faulty component (switch, wiring, or module) and clear codes to confirm the fix.

Door switch D faults often misdiagnosed

A door switch D fault can be set by a weak or dying battery, as low voltage causes modules to send erratic data.
The code may appear only in cold or wet weather if the switch or connector is intermittently failing due to temperature or moisture.
Aftermarket remote starters or alarm systems that tap into door switch wiring are a common cause of invalid data codes.
A faulty door switch can cause parasitic battery drain if it falsely signals the door is open, keeping modules awake.
U0519 can be stored alongside U0140 (Lost Communication With Body Control Module) if the BCM itself is failing.

Can I keep driving with U0519?

The vehicle is generally safe to drive because the fault typically affects convenience features rather than engine or safety systems. Avoid relying on the affected door's central locking or alarm functions until repaired, and address the issue promptly to prevent battery drain or security system malfunctions.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.