Code
U0523
Generic
U — Network/User
Invalid Data Received From Door Window Motor A
Views:
UK: 17
EN: 24
RU: 12
AI status
Completed
Completed
100%
Causes
- Open, short, or intermittent wiring to the door window motor (power, ground, or data/feedback lines)
- Corroded or loose connectors at the motor, door harness, or body control module (BCM)
- Failed door window motor or integrated position sensor/encoder
- Faulty door window regulator causing binding or stall current
- Faulty door control module, window motor driver, or transceiver (LIN/CAN)
- Blown fuse, poor battery/ignition supply, or low battery voltage
Symptoms
- Window A inoperative, moves erratically, or stops mid-travel
- Slow window movement or unusual noise from motor/regulator
- One or more modules log related communication faults or multiple door/window codes
- Intermittent operation or functions work after door flexing/wiggling
- Illuminated dashboard/service indicator or stored U-codes
What to check
- Retrieve freeze frame and full list of stored codes; record exact conditions when code set
- Attempt to operate the affected window while watching live data for motor position, current, and message status
- Inspect door harness, grommet, and connectors for corrosion, pin damage, or water intrusion; perform wiggle test while monitoring codes
- Check battery voltage and relevant fuses/relays for window/door circuits
- Measure supply voltage at the motor connector (key on) and while operating the window
- Check ground integrity at motor and module (low resistance to chassis)
Signal parameters
- Motor supply voltage: approx. 10–14 V when battery/ignition present; should be near battery voltage under no-load
- Motor terminal behavior: one terminal should be at battery potential and the other switched to ground (polarity reverses to change direction) during drive
- Typical DC motor coil resistance (varies by design): often ~1–10 ohms; stall current can be several amps — expect higher current when stalled
- Position/feedback sensor: discrete pulse or voltage proportional to position (specs vary); should produce stable readable signal during travel
- LIN bus: single-wire idle to battery voltage (~12 V) with defined message frames (check for noise, missing frames, or invalid payloads)
- CAN bus: CAN_H ~2.5–3.5 V, CAN_L ~2.5–1.5 V differential; check for lost or malformed frames if CAN used
Diagnostic algorithm
- Read and record all stored codes and live data. Note which window(s) and under what conditions the code appears.
- Clear codes, then reproduce the failure by operating the affected window while monitoring live data and communication status.
- Visually inspect door wiring, grommet, connectors and the motor/regulator assembly for damage, corrosion, or water ingress. Repair any obvious issues.
- Verify battery voltage and check fuses/relays for the window circuit. Replace any blown fuses and retest.
- With ignition on, measure voltage at the motor power/ground pins and verify proper switching during operation. If no switching, investigate upstream driver/module.
- Check ground return resistance from motor housing to chassis (
Likely causes
- Damaged harness in the door jamb (pinch point) creating intermittent signal
- Motor internal encoder or Hall sensor failed and sending invalid position data
- Motor is drawing excessive current because regulator is seized, corrupting feedback
- LIN or CAN bus transceiver on the door module or BCM is failing
- Connector corrosion causing high resistance and false readings
Fault status
Status
Invalid data received from Door Window Motor A — communication or feedback out-of-range. Inspect wiring, power/ground, motor/regulator, and module communication.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Workshop Manuals
Available brands with manuals
2
AUDI 11
6-speed manual gearbox 0B1, front-wheel drive — Workshop Manual (Edition 05.2014)
Workshop ManualAudi A3 (1997) – 1.6L 4-cylinder (2‑valve) Engine Mechanical Components Service Manual (AEH, AKL, APF) – Edition 07.2002
Workshop ManualAUDI A3 (2004) Workshop Manual — 2.0L FSI Turbo (4‑cyl, 4‑valve) Engine, Mechanics — Edition 03.2017
Workshop ManualAudi A3 2004 — Electrical System (Workshop Manual, Edition 02.2018)
Workshop ManualAudi A4 / A4 Cabriolet – 4.2 l V8 (5‑valve, timing chains) – Workshop Manual (Mechanics) – Edition 04.2007
Workshop ManualAudi A4 / A4 Cabriolet — Auxiliary Heater Workshop Manual (Edition 08.2004)
Workshop ManualAudi A4 / A4 Cabriolet (1.8T 4‑cyl turbo) — Motronic Injection & Ignition System Service Manual (Edition 01.2015)
Workshop ManualAudi A8 (2003) — Electrical System Workshop Manual (Edition 08.2014)
Workshop ManualAudi Q4 e-tron (Type F4) - Self-study Programme SSP 685
Workshop ManualAudi Q8 (2018) — Electrical System Workshop Manual (Edition 05.2019)
Workshop ManualAudi Servicing Manual — 7‑Speed Dual Clutch Transmission 0CJ / 0CL / 0CK / 0DN / 0DP / 0HL (Edition 05.2018)
Workshop ManualLAND ROVER 3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualLand Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualLand Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop ManualYour 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
Code
U0523
HYUNDAI
U — Network/User
Invalid Data Received From “Door Window Motor A”
Views:
UK: 13
EN: 15
RU: 15
AI status
Completed
Completed
100%
Causes
- Open, short, or intermittent wiring to the door window motor (power, ground, or data/feedback lines)
- Corroded or loose connectors at the motor, door harness, or body control module (BCM)
- Failed door window motor or integrated position sensor/encoder
- Faulty door window regulator causing binding or stall current
- Faulty door control module, window motor driver, or transceiver (LIN/CAN)
- Blown fuse, poor battery/ignition supply, or low battery voltage
Symptoms
- Window A inoperative, moves erratically, or stops mid-travel
- Slow window movement or unusual noise from motor/regulator
- One or more modules log related communication faults or multiple door/window codes
- Intermittent operation or functions work after door flexing/wiggling
- Illuminated dashboard/service indicator or stored U-codes
What to check
- Retrieve freeze frame and full list of stored codes; record exact conditions when code set
- Attempt to operate the affected window while watching live data for motor position, current, and message status
- Inspect door harness, grommet, and connectors for corrosion, pin damage, or water intrusion; perform wiggle test while monitoring codes
- Check battery voltage and relevant fuses/relays for window/door circuits
- Measure supply voltage at the motor connector (key on) and while operating the window
- Check ground integrity at motor and module (low resistance to chassis)
Signal parameters
- Motor supply voltage: approx. 10–14 V when battery/ignition present; should be near battery voltage under no-load
- Motor terminal behavior: one terminal should be at battery potential and the other switched to ground (polarity reverses to change direction) during drive
- Typical DC motor coil resistance (varies by design): often ~1–10 ohms; stall current can be several amps — expect higher current when stalled
- Position/feedback sensor: discrete pulse or voltage proportional to position (specs vary); should produce stable readable signal during travel
- LIN bus: single-wire idle to battery voltage (~12 V) with defined message frames (check for noise, missing frames, or invalid payloads)
- CAN bus: CAN_H ~2.5–3.5 V, CAN_L ~2.5–1.5 V differential; check for lost or malformed frames if CAN used
Diagnostic algorithm
- Read and record all stored codes and live data. Note which window(s) and under what conditions the code appears.
- Clear codes, then reproduce the failure by operating the affected window while monitoring live data and communication status.
- Visually inspect door wiring, grommet, connectors and the motor/regulator assembly for damage, corrosion, or water ingress. Repair any obvious issues.
- Verify battery voltage and check fuses/relays for the window circuit. Replace any blown fuses and retest.
- With ignition on, measure voltage at the motor power/ground pins and verify proper switching during operation. If no switching, investigate upstream driver/module.
- Check ground return resistance from motor housing to chassis (
Likely causes
- Damaged harness in the door jamb (pinch point) creating intermittent signal
- Motor internal encoder or Hall sensor failed and sending invalid position data
- Motor is drawing excessive current because regulator is seized, corrupting feedback
- LIN or CAN bus transceiver on the door module or BCM is failing
- Connector corrosion causing high resistance and false readings
Fault status
Status
Invalid data received from Door Window Motor A — communication or feedback out-of-range. Inspect wiring, power/ground, motor/regulator, and module communication.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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