U0211: Lost Communication With Seat Control Module D

What it means

Communication with Seat Control Module D 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 D manages seat functions assigned to it by the vehicle and sends status messages over the vehicle network. This code is set when the reporting module stops receiving expected messages from module D; it does not specify which seat or functions are affected.

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. Record freeze-frame data and check all modules for communication codes to see whether the fault is isolated to Seat Control Module D.
2. Check battery condition and the fuses and grounds supplying module D.
3. Inspect module D's connectors and wiring for loose terminals, corrosion, moisture, or physical damage.
4. Use a capable scan tool to check whether module D responds and whether the gateway can route messages to it.
5. When several network modules are affected, test the relevant CAN wiring and termination against the manufacturer's specification.

Common fixes

• Secure or repair a loose, corroded power or ground connection at module D.
• Replace a blown fuse once its cause has been corrected.
• Repair damaged CAN wiring or connector terminals serving Seat Control Module D.
• Correct a gateway routing or CAN termination fault confirmed by testing.
• Replace module D only after confirming its supply and network path are sound.

Can I keep driving?

Driving may be possible if the seat is secure and adjusted to a safe position, but functions assigned to module D may be unavailable. Do not drive if you cannot secure the seat or maintain a safe seating position.