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DTC codes / U05xx · Network communication / U0524

U0524Invalid Data Received From Door Window Motor B

U0524 is a communication fault indicating that a control module on the vehicle's network received invalid or corrupted data from the door window motor on the passenger side, often referred to as Door Window Motor B. The computer detected a message from that motor that did not match the expected format or contained implausible values, so it flagged the data as invalid rather than treating it as a valid status update.

SystemNetwork
Code typeGeneric (all makes)
SeverityLow
Fix difficultyIntermediate
AreaNetwork communication

Symptoms you may notice

  • The window on the affected door may not operate at all, or may move erratically or only in one direction.
  • The window may stop midway or reverse direction unexpectedly during operation.
  • A warning light or message on the dashboard indicating a body control or communication fault.
  • Often no symptoms besides the warning light, especially if the motor still functions but its data messages are intermittently corrupted.
  • Other body-related features on the same door, such as the door lock or mirror, may behave oddly if they share the same network segment.

Common causes, most likely first

  1. A failing door window motor module that is sending corrupted or out-of-range data onto the network.
  2. Damaged or chafed wiring in the door jamb harness, which is a common wear point for the network wires feeding the window motor.
  3. Corroded or loose electrical connectors at the window motor or at the body control module, causing intermittent data transmission.
  4. Low battery voltage or a weak charging system that causes modules to behave erratically and send invalid data frames.
  5. A software or calibration issue in the window motor module or the receiving control module, requiring a reflash or update.
  6. Water intrusion into the door cavity or the motor connector, leading to short circuits or signal degradation.
  7. A faulty body control module (BCM) or gateway module that misinterprets valid data from the window motor as invalid.

How to diagnose and fix it

  1. Perform a full scan of all modules to confirm U0524 is current and check for related communication codes in other modules.
  2. Inspect the door jamb wiring harness for chafing, broken wires, or corrosion, and repair any damaged sections.
  3. Disconnect and inspect the window motor connector for corrosion, water intrusion, or loose pins, then clean and reseat it.
  4. Test the battery and charging system to ensure stable voltage, as low voltage can cause invalid data messages.
  5. Check for technical service bulletins (TSBs) or software updates for the window motor module or body control module.
  6. If wiring and power are good, substitute a known-good window motor module to see if the code clears and stays away.
  7. As a last step, diagnose the body control module or gateway for internal faults that could corrupt or misinterpret network data.

What most technicians overlook on U0524

  • A door jamb wire harness that looks fine from the outside can have internal strand breaks that only show up when the door is opened and closed, so wiggle-testing the harness while watching live data is essential.
  • The window motor can still operate perfectly while sending invalid data, so a working window does not rule out the motor as the source of the code.
  • Low battery voltage or a weak alternator often sets communication codes like U0524 across multiple modules, so always verify charging system health before replacing parts.
  • Water leaks into the door cavity are a frequent hidden cause, and the motor connector may show green corrosion even when the window works normally.
  • Some vehicles require a relearn or calibration procedure after replacing the window motor, and skipping it can cause the new motor to send data the module rejects.

Can I keep driving with U0524?

The vehicle is generally safe to drive because the fault affects a convenience system, but avoid operating the affected window until the cause is repaired to prevent further damage or a stuck window. If the window is stuck open, cover it to keep weather out and have the fault diagnosed promptly.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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