A failing or contaminated door switch B or its connector at the door latch; Chafed, corroded or water-damaged wiring in the door-to-body harness boot; A poor ground or loose connector at the door module or body control module; A failing door module or body control module that misreads or misreports the switch signal; Low battery voltage or charging system problems causing network message corruption; A software or configuration mismatch after module replacement or reprogramming; Network bus faults, such as a shorted or open data line, corrupting the message

DTC codes / U05xx · Network communication / U0517

U0517Invalid Data Received From Door Switch B

Q: What does code U0517 mean?

Invalid Data Received From Door Switch B. U0517 is a communication fault that means the module receiving data from Door Switch B considers that data invalid or implausible. The computer is not reporting a failed switch itself; it is reporting that the signal it received over the network did not match expected values, so it flagged the message as untrustworthy.

U0517 is a communication fault that means the module receiving data from Door Switch B considers that data invalid or implausible. The computer is not reporting a failed switch itself; it is reporting that the signal it received over the network did not match expected values, so it flagged the message as untrustworthy.

SystemNetwork

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaNetwork communication

Symptoms you may notice

A door ajar or courtesy light warning that stays on when the door is clearly shut
Interior lights, puddle lamps or door chimes behaving erratically
A body control or door module that refuses to respond to the door switch input
Remote keyless entry or auto-lock features that stop working correctly
Often no symptoms besides the warning light, especially if the fault is intermittent
Related body systems such as window or mirror controls acting inconsistently

Common causes, most likely first

A failing or contaminated door switch B or its connector at the door latch
Chafed, corroded or water-damaged wiring in the door-to-body harness boot
A poor ground or loose connector at the door module or body control module
A failing door module or body control module that misreads or misreports the switch signal
Low battery voltage or charging system problems causing network message corruption
A software or configuration mismatch after module replacement or reprogramming
Network bus faults, such as a shorted or open data line, corrupting the message

How to diagnose and fix it

Scan all modules for stored and pending codes and record the full network fault picture before clearing anything
Verify battery voltage and charging system health, since low voltage corrupts network messages
Inspect the door switch B connector, latch assembly and the door-to-body harness boot for corrosion, water intrusion and chafing
Check and clean the ground points and connectors at the door module and body control module
Test the door switch B signal directly with a multimeter or scan tool live data while opening and closing the door
Check the communication bus for shorts or opens if other modules also report network faults
Repair or replace the faulty switch, harness or module, then clear codes and confirm the fault does not return

Why door switch data goes invalid

U0517 rarely means the switch is dead; it means the receiving module rejected the data, so a healthy switch can still trigger this code through a wiring or bus problem
Water intrusion in the door or the harness boot is a frequent hidden cause that only shows up after rain or a car wash
A weak battery or failing alternator can set this code because corrupted network messages look like invalid data to the receiving module
Replacing the door switch without checking the bus and grounds often leaves the code present and wastes the part
Other body codes stored alongside U0517 usually point to the shared harness or module rather than the switch itself

Can I keep driving with U0517?

The vehicle remains safe to drive because this fault affects body convenience functions rather than engine, braking or steering control. Avoid ignoring repeated warnings, and have the circuit inspected soon if door ajar warnings, interior lights or locking behavior become unreliable.

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.