Code
U0559
Generic
U — Network/User
Invalid Data Received From Radio Transceiver
AI status
Completed
Completed
100%
Causes
- Faulty radio transceiver (internal electronics or firmware)
- Corroded, loose, or damaged connector at the radio transceiver
- Power supply or ground problem to the radio transceiver (intermittent or low voltage)
- CAN/LIN/MOST bus wiring damage, short, open, or poor termination
- Bus interference or signal integrity issues (noise, missing termination)
- Software mismatch or corrupted module flash after update
Symptoms
- Stored U0559 DTC present on scan tool
- Intermittent or total loss of radio, Bluetooth, or telematics functions
- Other modules reporting communication errors or U-codes
- Audio dropouts, distorted audio, or loss of infotainment features
- Possible warning or message on instrument cluster related to communications
What to check
- Read all stored codes and freeze frame data with a capable scan tool; note any related U-codes
- Verify battery voltage is within specification before and during tests
- Visually inspect connector(s) and wiring to the radio transceiver for corrosion, bent pins, or damage
- Backprobe or measure power and ground at the radio transceiver connector
- Scan the vehicle network topology to identify which bus (CAN/LIN/MOST) the transceiver uses and look for bus-off or high error counts
- Measure CANH/CANL voltages with a multimeter at the transceiver connector (compare to a healthy node)
Signal parameters
- High-speed CAN typical idle voltages: CANH ≈ 2.5 V, CANL ≈ 2.5 V (recessive); dominant levels CANH ≈ 3.5 V and CANL ≈ 1.5 V (differential ≈ 2 V)
- Termination resistance for two-wire high-speed CAN: approximately 60 ohms (two 120 Ω terminators in parallel)
- Message timing: transceiver heartbeat or periodic messages commonly repeat every 100–1000 ms (vehicle-specific — verify expected periodicity)
- Error counters: rising CAN error counters or bus-off state indicate a signal integrity problem
- If using LIN or MOST, check manufacturer-specific idle voltages and signal characteristics
Diagnostic algorithm
- Connect a full-function scan tool and document DTCs, freeze frame, and live data. Note related U-codes and affected bus.
- Clear codes and reproduce the fault (if safe) to confirm it returns. Record conditions when it sets (key on, engine running, after sleep/wake).
- Verify battery and charging system voltages; test with engine running and accessories on to reproduce load conditions.
- Inspect radio transceiver connectors, wiring harness, and antenna/ground connections. Repair any corrosion, damage, or loose terminals.
- Verify proper power and ground at the transceiver. Wiggle harness while monitoring live data for intermittent changes.
- Check the vehicle network: measure CANH/CANL at the transceiver and at a known-good node. Verify termination resistance and look for shorts to battery or ground.
- Use an oscilloscope or bus analyzer to capture traffic and look for malformed frames, missing expected IDs, excessive retries, or noise. Compare with a healthy capture if available.
- Isolate the transceiver: disconnect the transceiver (if safe) and observe whether the bus stabilizes or other modules stop reporting errors. Reconnect and retest.
- Check software/firmware: verify module part number and calibration match factory specs. Re-flash or update module software only when confirmed and per manufacturer procedure.
- If hardware fault is confirmed (failed module, internal transceiver), replace the radio transceiver and perform any required module coding or programming. Re-test the network and clear codes.
- After repair, road test and monitor for recurrence of U0559 and related codes. If intermittent, consider harness replacement or additional shielding for noise sources.
Likely causes
- Radio transceiver module hardware failure
- Poor power or ground at the radio transceiver
- Damaged connector or wiring between radio transceiver and gateway/CAN
- Incorrect or corrupted firmware in the radio transceiver
- CAN bus termination or wiring fault causing corrupted messages
Fault status
Status
Invalid data received from radio transceiver — message contents, format, or timing failed validation resulting in communication fault.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Similar codes
Repair manuals
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Code
U0559
HYUNDAI
U — Network/User
Invalid Data Received From Radio Transceiver
AI status
Completed
Completed
100%
Causes
- Faulty radio transceiver (internal electronics or firmware)
- Corroded, loose, or damaged connector at the radio transceiver
- Power supply or ground problem to the radio transceiver (intermittent or low voltage)
- CAN/LIN/MOST bus wiring damage, short, open, or poor termination
- Bus interference or signal integrity issues (noise, missing termination)
- Software mismatch or corrupted module flash after update
Symptoms
- Stored U0559 DTC present on scan tool
- Intermittent or total loss of radio, Bluetooth, or telematics functions
- Other modules reporting communication errors or U-codes
- Audio dropouts, distorted audio, or loss of infotainment features
- Possible warning or message on instrument cluster related to communications
What to check
- Read all stored codes and freeze frame data with a capable scan tool; note any related U-codes
- Verify battery voltage is within specification before and during tests
- Visually inspect connector(s) and wiring to the radio transceiver for corrosion, bent pins, or damage
- Backprobe or measure power and ground at the radio transceiver connector
- Scan the vehicle network topology to identify which bus (CAN/LIN/MOST) the transceiver uses and look for bus-off or high error counts
- Measure CANH/CANL voltages with a multimeter at the transceiver connector (compare to a healthy node)
Signal parameters
- High-speed CAN typical idle voltages: CANH ≈ 2.5 V, CANL ≈ 2.5 V (recessive); dominant levels CANH ≈ 3.5 V and CANL ≈ 1.5 V (differential ≈ 2 V)
- Termination resistance for two-wire high-speed CAN: approximately 60 ohms (two 120 Ω terminators in parallel)
- Message timing: transceiver heartbeat or periodic messages commonly repeat every 100–1000 ms (vehicle-specific — verify expected periodicity)
- Error counters: rising CAN error counters or bus-off state indicate a signal integrity problem
- If using LIN or MOST, check manufacturer-specific idle voltages and signal characteristics
Diagnostic algorithm
- Connect a full-function scan tool and document DTCs, freeze frame, and live data. Note related U-codes and affected bus.
- Clear codes and reproduce the fault (if safe) to confirm it returns. Record conditions when it sets (key on, engine running, after sleep/wake).
- Verify battery and charging system voltages; test with engine running and accessories on to reproduce load conditions.
- Inspect radio transceiver connectors, wiring harness, and antenna/ground connections. Repair any corrosion, damage, or loose terminals.
- Verify proper power and ground at the transceiver. Wiggle harness while monitoring live data for intermittent changes.
- Check the vehicle network: measure CANH/CANL at the transceiver and at a known-good node. Verify termination resistance and look for shorts to battery or ground.
- Use an oscilloscope or bus analyzer to capture traffic and look for malformed frames, missing expected IDs, excessive retries, or noise. Compare with a healthy capture if available.
- Isolate the transceiver: disconnect the transceiver (if safe) and observe whether the bus stabilizes or other modules stop reporting errors. Reconnect and retest.
- Check software/firmware: verify module part number and calibration match factory specs. Re-flash or update module software only when confirmed and per manufacturer procedure.
- If hardware fault is confirmed (failed module, internal transceiver), replace the radio transceiver and perform any required module coding or programming. Re-test the network and clear codes.
- After repair, road test and monitor for recurrence of U0559 and related codes. If intermittent, consider harness replacement or additional shielding for noise sources.
Likely causes
- Radio transceiver module hardware failure
- Poor power or ground at the radio transceiver
- Damaged connector or wiring between radio transceiver and gateway/CAN
- Incorrect or corrupted firmware in the radio transceiver
- CAN bus termination or wiring fault causing corrupted messages
Fault status
Status
Invalid data received from radio transceiver — message contents, format, or timing failed validation resulting in communication fault.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Similar codes
Repair manuals
Manual library for HYUNDAI
371
Browse 371 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
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