DTC codes / U05xx · Network communication / U0527
U0527 is a network communication code indicating that a control module on the vehicle's Controller Area Network (CAN) bus has received invalid or corrupted data from the door window motor designated as 'E'. The computer detected a message from that motor that failed its internal validity check, such as a missing checksum, out-of-range value, or incorrect message length, so the receiving module flagged the data as untrustworthy.
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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