OBD2 Code U0519: Invalid Data from Door Switch D
The U0519 diagnostic trouble code indicates that a control module, typically the Body Control Module (BCM), has received invalid, corrupt, or out-of-range data from the door switch identified as 'D' via the CAN communication bus. This is a network communication code (U0000-U1000), meaning the issue is not necessarily with the mechanical switch itself but with the integrity of the data signal it transmits. The receiving module detects that the information does not conform to the expected format or values per the protocol, which can be due to transmission errors, electrical interference, or a fault in the transmitting module.
1. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.
2. Most Common Causes
- Faulty door switch module D (switch integrated into the latch or handle)
- Damaged CAN bus wiring (short circuit, open circuit, or abnormal resistance)
- Corroded, oxidized, or bent pins in the door switch D connector or terminal
- Faulty BCM or body control module (receiver)
- Electromagnetic interference affecting data transmission
- Incorrect termination resistance on the CAN bus
- Corrupted software or calibration in the control module
3. Symptoms You Will Notice
- Door ajar warning light stays on or behaves erratically
- Interior lights may not operate correctly when the door opens or closes
- Power door locks may malfunction or fail to respond
- Possible communication errors with other modules
4. Step-by-Step Diagnosis
Scan the vehicle for all stored codes and freeze frame data
Inspect the door switch D connector and wiring for corrosion, damage, or loose pins
Test the CAN bus wiring for shorts, opens, and proper resistance (typically 60 ohms)
Check for electromagnetic interference sources near the CAN bus
Verify the door switch D module operation using a multimeter or scan tool
If wiring and switch check out, suspect a faulty BCM or corrupted software
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is generally safe to drive with code U0519, but you may experience minor electrical issues like a false door ajar warning or interior light problems. It is recommended to diagnose and repair the issue soon to prevent potential battery drain or further communication faults.
How much does it cost to fix?▼
The cost to fix code U0519 typically ranges from $100 to $400, depending on the root cause. A simple switch replacement or wiring repair may cost $100-$200, while a BCM replacement or reprogramming can run $300-$600 or more.