U0526 indicates that a module on the vehicle's CAN network (usually the body control module) received invalid or unexpected data from the door window motor designated as 'D'. This typically points to a communication problem between the motor and its controlling module rather than a fault in the engine computer.
The motor’s internal position sensor or CAN transceiver is sending corrupted data, causing the receiving module to flag an invalid data error.
Open circuits, short‑to‑ground/short‑to‑power, or corroded pins in the harness/connector between motor D and the door/body control module can distort the CAN signal.
If the door has a dedicated module that processes motor data, a fault in that module can cause it to misinterpret or corrupt the CAN messages.
The BCM, which often receives window motor data, may have a defective CAN transceiver or software glitch that leads to false invalid‑data detection.
Although the powertrain control module is not normally involved in window motor communication, a severe CAN bus fault affecting multiple modules could theoretically trigger this code; however, PCM replacement is seldom the correct fix.
No. The powertrain control module is rarely involved in door window motor communication. Replacing the PCM/ECM usually does not resolve the code and is not recommended unless all other CAN‑bus and motor components have been verified as good.
A blown fuse that cuts power to the window motor or its module will typically set a different code (e.g., loss of communication or motor‑circuit fault). U0526 specifically points to invalid data, so while checking fuses is a good first step, a blown fuse alone is unlikely to be the sole cause.
Clearing the DTC with a scan tool after the repair is sufficient. Some vehicles may require a key‑on/key‑off cycle or a short drive for the BCM to re‑learn the motor’s position, but no special reset procedure is normally needed.