U0210: Lost Communication With Seat Control Module C

What it means

Communication with Seat Control Module C was not received as expected. The code does not identify which seat or functions the module controls.

At a glance

• Usually lights the warning light of the system that lost communication

How it works

Seat Control Module C controls seat-related functions assigned to it by the vehicle and communicates its status over the network. This code is set when the reporting module does not receive expected messages from module C; the code alone does not identify which seat or functions it controls.

Common causes

Most likely first.

1. Module unpowered
2. Gateway module routing CAN messages incorrectly
3. CAN terminating resistor (120 Ω) drifted out of spec

Symptoms

• Multiple warning lights may illuminate
• Affected modules may go into limp mode or shut down
• Specific functions inoperative depending on module
• Diagnostic tools may show communication faults

How to diagnose it

1. Save freeze-frame data and scan all modules for communication faults to establish whether module C alone is missing or the network has broader problems.
2. Check the battery condition, then inspect the fuses and grounds supplying Seat Control Module C.
3. Inspect module C's connectors and wiring for damage, corrosion, moisture, or loose terminals.
4. Use a capable scan tool to see whether module C responds and whether the gateway shows a communication path to it.
5. If other modules also fail to communicate, test the relevant CAN wiring and termination against the manufacturer's specification.

Common fixes

• Clean and secure a corroded or loose power, ground, or connector connection at module C.
• Replace a blown module fuse after addressing the cause.
• Repair damaged network wiring or connector terminals to Seat Control Module C.
• Repair a confirmed gateway routing or CAN termination fault.
• Replace Seat Control Module C only after its supply and network connections pass testing.

Can I keep driving?

The vehicle may remain drivable, but seat functions assigned to module C may not work or may not adjust as expected. Set the seat securely before driving and avoid driving if your seating position cannot be made safe.