What it means
A receiving module detected implausible data from side obstacle detection module C (corner radar). Distance/closing-speed values fail plausibility checks and are rejected; blind-spot warning may be inhibited.
How it works
Side obstacle detection control module C, a corner radar, reports detected-object distance and closing-speed information over the vehicle network. Receiving modules check these values for plausibility; U054F sets when a module rejects data attributed to radar C, which can inhibit blind-spot warnings.
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 U054F, related driver-assistance codes, and freeze-frame details to identify which module rejected radar C's data and when.
- Check live data for radar C's communication status and whether its distance and closing-speed readings are plausible when nearby objects move past that side of the vehicle.
- Inspect radar C's mounting area for dirt, damage, misalignment, or obstruction, and check its connector and wiring for corrosion or impact damage.
- Check whether body repairs, a bumper replacement, or module or software replacement preceded the fault, and verify the radar's configuration and alignment requirements from the manufacturer.
- If the installation and wiring are sound, use the manufacturer's network diagnostics to check radar messages and gateway routing.
Common fixes
- Clean an obstructed radar C sensing area and remove anything blocking it.
- Repair a loose, corroded, or damaged connector or wiring to radar C.
- Restore the radar's correct mounting and alignment after verifying the manufacturer's procedure.
- Correct an incompatible module configuration or software mismatch after replacement.
- Repair or replace radar C if its data remains implausible with sound wiring, mounting, and configuration.
Can I keep driving?
You can generally drive, but blind-spot alerts that depend on radar C may be unavailable or unreliable. Check mirrors and blind spots directly, and do not rely on the warning system until it is repaired.
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.