What it means
A receiving module detected implausible data from seat control module C. Seat position, memory recall or heating/ventilation values fail plausibility checks and are rejected.
How it works
Seat control module C sends seat position and supported memory or comfort-function data to other vehicle modules. This code sets when a receiving module rejects data from module C as implausible; the exact seat and functions assigned to C vary by vehicle.
Common causes
Most likely first.
- Module internal fault or sensor input drift
- Software version mismatch after replacement
- Gateway module routing CAN messages incorrectly
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
- Scan all modules and save freeze-frame data to determine which module reported U0511 and whether seat or network codes accompany it.
- Identify the seat and functions assigned to module C, then check which adjustment, memory, heating, or ventilation functions fail if fitted.
- Inspect module C's connector and accessible under-seat wiring for looseness, corrosion, damage, or pinching during seat travel.
- Check module C's power and ground using the manufacturer's procedure, particularly if multiple seat functions are inoperative.
- Compare live position and status values with actual seat behavior, then check network messages and module configuration using vehicle-specific service information.
Common fixes
- Reconnect or clean a loose or corroded connector at seat control module C.
- Repair pinched or damaged wiring or restore a poor power or ground connection.
- Correct module C's configuration or software if the fault began after replacement or programming.
- Replace seat control module C if its supply, wiring, and configuration are correct but it continues to send implausible data.
Can I keep driving?
Driving is generally possible if the affected seat is securely locked in a safe position. Do not drive if it moves unexpectedly or cannot be secured.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.