U0516

Code

Generic U — Network/User

Invalid Data Received From Door Switch A

Brand: Generic

Type: U — Network/User

Views: UK: 34 EN: 67 RU: 35

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty door position/door switch A (stuck, shorted, or intermittent)
Damaged wiring harness (open, short to ground or battery, high resistance) between switch and control module
Poor connector contacts or corrosion at switch or module connector
Body Control Module (BCM) or other network module sending/receiving corrupted message
CAN/LIN bus noise, missing termination, or intermittent network communication
Incorrect module programming or software error after service or update

Symptoms

Door ajar indicator incorrect or flickering on dash
Interior lights behave incorrectly when doors open/close
Central locking or keyless entry may not operate for that door
Unable to arm/disarm alarm or inconsistent alarm triggers
Related control module stores communication/invalid-data DTCs
Inability for diagnostics to read consistent door-switch state in live data

What to check

Read all current and history DTCs and note freeze-frame or timestamp if available
Check live data for door-switch A state while opening/closing the door with a scanner
Inspect door switch connector and wiring at the door and hinge area for damage, corrosion, or pulling
Visually inspect BCM/gateway connectors and grounds related to door circuits
Check vehicle battery voltage and chassis ground integrity
If safe, wiggle harness and connectors while monitoring live data for intermittent changes

Signal parameters

Switch state: binary open/closed reported in module live data (expected stable transition when door is opened/closed)
Signal voltage at switch: typically near 0 V or battery voltage depending on circuit design — expect stable, distinct levels (not intermittent or between levels)
Message frequency: door state is usually sent on change or at low periodic rate; check for presence of CAN/LIN message ID associated with door module
Signal integrity: no repeated corrupted frames, checksum errors, or unusual bus errors logged by gateway/BCM

Diagnostic algorithm

Retrieve and record DTCs, freeze-frame and related U-codes. Note if code is stored or pending.
Verify battery voltage and good chassis ground. Low voltage can cause communication errors.
Observe live data for Door Switch A while operating the door — confirm if signal changes consistently.
Visually inspect the switch, connector and wiring at the door hinge for damage, corrosion, or pinched wires. Repair any obvious faults.
With ignition on, measure voltage at the switch connector while toggling the switch: compare to expected logic levels (0 V vs battery).
Perform a wiggle/strain test on the harness while monitoring live data to reveal intermittent faults.
If wiring and connector look good, disconnect switch and check continuity to the BCM/gateway pin; repair any opens/shorts.
Check vehicle network (CAN/LIN) for other errors. Use a scope or CAN tool to verify message presence and integrity for door-state messages.
If wiring and switch check good, substitute a known-good switch or connector to confirm component failure.
If new module or software work was recently done, verify correct programming and update module software if available.
After repairs replace/clear DTCs and validate repair by cycling door and re-checking for code return and correct behavior.

Likely causes

Corroded or loose connector at the door switch or BCM
Broken or pinched wire in door harness (high-strain area at hinge)
Faulty door switch (mechanical failure)
Intermittent ground or supply to the switch circuit
Network message checksum or formatting error from BCM or gateway

Fault status

⚠️ Status

Invalid or corrupted data received from Door Switch A — signal out of expected range or communication format unacceptable to receiving control module.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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