U0208: Lost Communication With Seat Control Module A

What it means

Communication with Seat Control Module A 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 A exchanges seat status and control messages with other vehicle modules; A is a module label and does not identify which seat it serves. U0208 sets when expected valid messages from this specific seat module are missing for the calibrated time.

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 details and scan all modules for communication codes to find out whether U0208 is isolated or part of a broader network fault.
2. Use a capable scan tool to check whether Seat Control Module A responds and whether other modules report A as unavailable.
3. Identify Module A from vehicle-specific wiring information and inspect its connector, harness, and grounds for damage, corrosion, moisture, or loose connections.
4. Test the module’s power and ground circuits under the manufacturer’s specified conditions before considering module failure.
5. If supplies are correct, test the relevant CAN wiring and termination to specification and check gateway routing if other modules are missing too.

Common fixes

• Repair a loose, damaged, or corroded Module A connector or harness.
• Restore a failed power feed or ground to Seat Control Module A.
• Repair a confirmed CAN wiring or termination fault.
• Correct gateway routing if network evidence indicates a routing problem.

Can I keep driving?

Seat adjustment or related features may be unavailable, so set the seat in a safe driving position before moving and do not adjust it while driving. If the seat cannot be secured or positioned safely, do not drive until that is resolved.