What Does U0261 Mean?
Communication has been lost with Seat Control Switch Module 'B', usually the passenger seat control module. The body control network cannot communicate with this module to receive seat adjustment commands.
Common Causes
40%
Failed passenger seat control switch module
25%
Corroded or disconnected connector at passenger seat module
20%
Damaged wiring harness under passenger seat
10%
Blown fuse or open power circuit to seat module
5%
Network communication circuit fault
Diagnostic Steps
1
Step 1: Access passenger seat control module by moving seat fully forward; inspect connector for security, corrosion, and pin damage
2
Step 2: Verify power and ground circuits at the seat control module using a digital multimeter
3
Step 3: Check for physical damage to wiring harness caused by seat rail movement or objects under the seat
4
Step 4: Test communication circuits (CAN High/Low if applicable) for proper voltage and continuity
5
Step 5: Replace passenger seat control module if all wiring and power circuits test within specification
Estimated Repair Cost
$200 - $700
Parts + labor, varies by vehicle and location
Communication has been lost with Seat Control Switch Module 'B', usually the passenger seat control module. The body control network cannot communicate with this module to receive seat adjustment commands.
The most common cause of U0261 (Lost Communication With Seat Control Switch Module "B") is: Failed passenger seat control switch module
Typical repair costs for U0261 range from $200 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
No direct safety concern. Results in loss of powered passenger seat adjustment but does not affect vehicle operation or driver controls.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0261 to identify the root cause.
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Quick Info
Category
Network
System
Seat Control and Comfort Systems
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
