U0517

Code

Generic U — Network/User

Invalid Data Received From Door Switch B

Brand: Generic

Type: U — Network/User

Views: UK: 18 EN: 31 RU: 25

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty Door Switch B (stuck, intermittent, or electrically failed)
Damaged wiring or poor connector at the door switch (corrosion, bent pins, broken conductor)
Short to power or ground in the switch circuit
Faulty Body Control Module (BCM), door module or other control module that reads the switch
Corrupted or noisy messages on vehicle data bus (CAN/LIN) due to bad termination, interference or wiring fault
Software anomaly or calibration mismatch in the BCM or gateway module

Symptoms

Door ajar or door open indicator may behave incorrectly (stays on, flickers, or does not illuminate)
Power door lock/unlock or auto-lock features may not operate correctly for that door
Interior lighting may remain on or fail to turn on when door is opened/closed
False alarm or central locking misbehavior
One or more modules may report related network communication errors; in some vehicles MIL may not illuminate

What to check

Read all stored, pending and freeze-frame codes from all modules with a capable scan tool; look for related U-codes and BCM or door module codes
Use a scan tool to monitor the live state of Door Switch B while opening/closing the door and actuating the switch
Visually inspect door switch, harness, and connector for corrosion, bent pins, water intrusion or physical damage
Wiggle test wiring and connector while watching live data for intermittent changes
Measure voltage and resistance at the switch connector with ignition on (check for expected open/closed values)
Check module power and ground circuits for proper voltage and low resistance to chassis ground

Signal parameters

Door switch logic: typically a discrete input — closed = near 0 V (or near battery voltage depending on pull-up/pull-down design); open = opposite state
Expected idle CAN bus voltages: CAN_H ≈ 2.5 V (recessive), CAN_L ≈ 2.5 V; dominant states typically move CAN_H toward ~3.5 V and CAN_L toward ~1.5 V (differential ≈ 2 V)
Module supply voltage: nominal battery voltage (11–14.5 V) with ignition on
Switch continuity: near 0 Ω when closed, very high resistance/open when open (values depend on switch design)

Diagnostic algorithm

Connect a manufacturer-capable scan tool. Read and record all codes from all modules. Note freeze frame and any correlated U-codes.
Clear codes and attempt to reproduce. Monitor Door Switch B status in live data while operating the door to see if readings correspond to physical position.
Visually inspect the door switch, switch actuator, connector and wiring for corrosion, water damage, pin damage or broken wires. Repair or secure as needed.
Perform a wiggle test on the harness and connector while observing the switch input on the scan tool. If the signal changes intermittently, repair the harness/connector or replace the switch.
With ignition on, measure the switch connector: verify reference voltage (pull-up/pull-down), signal voltage states for open/closed, and switch continuity. Compare to expected values.
Check power and ground at the controlling module (BCM/door module). Verify proper supply voltage and good ground connections.
Inspect CAN/LIN bus health: use a scan tool to check for bus errors and an oscilloscope to verify waveform integrity and termination if available. Repair any bus wiring faults or replace bad termination resistors.
If wiring and switch test good, perform an input/output test or swap a known-good door switch (or door module, if serviceable) to isolate module vs. sensor failure.
If module is suspected, check for software updates or known technical service bulletins (TSBs). Reflash or reprogram module per manufacturer procedures before replacement.
After repairs, clear DTCs and perform full functional test and road/test cycle to ensure the fault does not return.

Likely causes

Wiring/connectors between Door Switch B and its controlling module are damaged or intermittent (most common)
Door Switch B has failed electrically (open, short, or unstable contact)
Local module (door module/BCM) input circuit fault or internal failure
CAN/LIN communication fault causing corrupted data frames

Fault status

⚠️ Status

Invalid or corrupted data frames received from the Door Switch B circuit/module on the vehicle bus. Fault may be stored as current or intermittent; may not always illuminate the MIL but can cause incorrect door-related functions.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

Repair manuals

Brands with available manuals

6,838

The library contains 6,838 repair and diagnostic manuals. Choose a brand to open the full manual tree by year, model and trim.

1,160

207

138

371

320

166

856

296

406

136

2,042

131

139

221

Your experience will help others

+100 karma for a short comment :)

Was this AI description helpful?

Your feedback helps improve AI descriptions.

👍 Like 0 👎 Dislike 0

Send to email