What it means
A receiving control module has detected invalid data from the Radio Transceiver. The code identifies the source of the data; it does not specify which values are invalid or why.
How it works
The radio transceiver sends information to other vehicle modules over the vehicle network. U0559 means a receiving module rejected data attributed to the transceiver as invalid; the code does not identify the particular data or the reason it failed.
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 record freeze-frame and communication details to identify the receiving module and any related radio or network faults.
- Check radio and transceiver functions for symptoms, such as loss of audio or other features tied to the vehicle's transceiver.
- Inspect the radio transceiver's connectors and harness for loose connections, corrosion, moisture or damage.
- Use a scan tool to review available transceiver data and network status while operating its affected functions.
- Check other modules for gateway or communication faults that could indicate message routing problems.
- If wiring and routing are sound, investigate an internal transceiver fault or software/configuration mismatch, particularly after replacement.
Common fixes
- Repair loose, damaged or corroded transceiver wiring and connectors.
- Restore a poor power or ground connection to the radio transceiver.
- Correct software or configuration following a transceiver replacement or update.
- Repair or replace the transceiver if its data remains invalid.
- Address gateway routing faults if other modules show related communication problems.
Can I keep driving?
If only radio or transceiver features are affected and there are no other warnings, driving is generally possible. Do not rely on any affected communication or vehicle feature that is needed for safe operation.
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.