Code U0260 indicates that the vehicle's communication network has lost contact with the seat control switch module. This module manages power seat adjustments and memory functions, and it communicates with other control units via the CAN bus. When the network cannot exchange data with this module, seat functions become inoperative and the code is set.
Damaged, corroded, or disconnected wiring between the seat control switch module and the CAN bus harness is the most frequent cause.
Internal failure of the module itself can prevent it from transmitting or receiving data on the network.
Loose, bent, or contaminated terminals at the module connector or the gateway/body control module connector interrupt communication.
A blown fuse, open power feed, or missing ground prevents the module from powering up and joining the network.
Incorrect bus termination resistance or a fault on the shared CAN circuit can isolate the seat module from the rest of the network.
A failure in the gateway or body control module that routes messages to the seat module can mimic a lost-communication condition; this is less common than wiring or module issues.
No. U0260 is a communication loss with a peripheral module; the root cause is almost always wiring, connectors, power/ground, or the seat module itself. Replacing the PCM or BCM is rarely justified and should only be considered after all other causes are eliminated.
Yes. Low system voltage can cause modules to drop off the CAN bus temporarily. Clear the code after charging or replacing the battery and verify it does not return.
Intermittent operation usually indicates a loose connector, a wiring break that makes contact in certain positions, or an internal module fault that worsens with temperature or vibration.
The vehicle is drivable, but power seat adjustment and memory functions will be unavailable. If the driver's seat position cannot be set safely, the vehicle should not be operated until repaired.