U0272 indicates that the vehicle's communication network can no longer exchange data with the seat control switch module designated as "D". The loss of communication prevents the module from receiving commands or reporting its status, which can affect seat adjustment functions.
Internal circuitry or transceiver failure inside the module stops it from transmitting or receiving on the bus.
Open circuits, shorted wires, or oxidized pins interrupt the CAN/LIN signals to the module.
A blown fuse, faulty relay, or poor ground connection prevents the module from powering up.
Incorrect termination resistance or a break in the bus wiring can isolate the module from the network.
An outdated calibration or incorrect module ID can cause the network to ignore the seat module.
Only considered after all wiring, power, and module checks are verified; the main controller may have a defective communication driver.
No. The PCM is rarely responsible; the fault is almost always in the seat module, its wiring, power/ground, or the shared bus.
If the fuse supplying power to the seat module is blown, replacing it can restore communication, but the underlying cause of the blown fuse must be identified.
Many vehicles require a calibration or initialization procedure after a new seat module is installed; consult the service information for the specific vehicle.
Clearing the code only removes the stored fault; the communication loss will return until the physical or electrical issue is corrected.