Code
U0587
Generic
U — Network/User
Invalid Data Received From With Radiator Anti Tamper Device
AI status
Completed
Completed
100%
Causes
- Faulty Radiator Anti‑Tamper Device (module failure)
- Intermittent or open/shorted wiring between RATD and network
- Poor connector contact or corrosion at the RATD module
- CAN/LIN bus communication errors (noise, missing termination, shorts)
- Software incompatibility or corrupted module flash
- Aftermarket device or incorrect module replacement
Symptoms
- MIL/VCI warning may be illuminated or manufacturer message stored
- Related systems that depend on RATD data may show faults or limited functionality
- Intermittent or permanent communication warnings in networked modules
- Freeze frame may show unexpected values from RATD or bus errors
- Possible loss of functionality tied to radiator security features (manufacturer dependent)
What to check
- Read all network U‑codes and related module DTCs; record freeze frame and ignition history
- Verify battery voltage (should be stable near 12.6 V at key OFF, 13.5–14.8 V while running)
- Visually inspect RATD harness and connectors for damage, corrosion, or loose pins
- Use a scan tool to confirm the RATD module is present on the network and responding
- Check for recent repairs, module replacements, or aftermarket devices on the cooling system or vehicle bus
- Scan for CAN/LIN bus error counters and active bus faults
Signal parameters
- Typical CAN bus idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V
- CAN dominant state: CAN_H ≈ 3.5–3.9 V, CAN_L ≈ 0.9–1.5 V (exacts vary by vehicle)
- Common CAN bitrates: 125 kbps, 250 kbps, 500 kbps (verify vehicle spec)
- Expected message frequency: periodic messages often 1–100 Hz depending on signal
- Bus termination: 2 × 120 Ω at ends of CAN network (check for 60 Ω across CAN_H/CAN_L if fully connected)
Diagnostic algorithm
- Retrieve all codes and freeze frame data from every network module. Note any other U‑codes or errors.
- Clear U0587 and related codes, then cycle ignition and test-drive to see if code returns and under what conditions.
- Verify vehicle battery and charging system voltage and stability; charge or replace battery if low.
- Inspect RATD physical connectors and harness: repair damaged wires, clean corroded terminals, reseat connectors.
- With a capable scan tool, confirm the RATD module appears on the bus, read its software/calibration IDs and compare to factory spec.
- Check for aftermarket modules or splices on the vehicle data bus and remove or isolate them for testing.
Likely causes
- Bad or intermittent connector/wiring to the Radiator Anti‑Tamper Device
- Radiator Anti‑Tamper Device producing corrupted or out‑of‑range messages
- Bus errors caused by poor termination, shorted CAN/LIN, or electrical noise
- Software mismatch or corrupted configuration in RATD or receiving module
- Low/unstable vehicle supply voltage affecting module communications
- Aftermarket accessories or recent repairs altering bus topology
Fault status
Status
Invalid data received from Radiator Anti‑Tamper Device — message format/checksum or timing/ID mismatch detected on vehicle data bus.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Repair manuals
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Code
U0587
HYUNDAI
U — Network/User
Invalid Data Received From With Radiator Anti Tamper Device
AI status
Completed
Completed
100%
Causes
- Faulty Radiator Anti‑Tamper Device (module failure)
- Intermittent or open/shorted wiring between RATD and network
- Poor connector contact or corrosion at the RATD module
- CAN/LIN bus communication errors (noise, missing termination, shorts)
- Software incompatibility or corrupted module flash
- Aftermarket device or incorrect module replacement
Symptoms
- MIL/VCI warning may be illuminated or manufacturer message stored
- Related systems that depend on RATD data may show faults or limited functionality
- Intermittent or permanent communication warnings in networked modules
- Freeze frame may show unexpected values from RATD or bus errors
- Possible loss of functionality tied to radiator security features (manufacturer dependent)
What to check
- Read all network U‑codes and related module DTCs; record freeze frame and ignition history
- Verify battery voltage (should be stable near 12.6 V at key OFF, 13.5–14.8 V while running)
- Visually inspect RATD harness and connectors for damage, corrosion, or loose pins
- Use a scan tool to confirm the RATD module is present on the network and responding
- Check for recent repairs, module replacements, or aftermarket devices on the cooling system or vehicle bus
- Scan for CAN/LIN bus error counters and active bus faults
Signal parameters
- Typical CAN bus idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V
- CAN dominant state: CAN_H ≈ 3.5–3.9 V, CAN_L ≈ 0.9–1.5 V (exacts vary by vehicle)
- Common CAN bitrates: 125 kbps, 250 kbps, 500 kbps (verify vehicle spec)
- Expected message frequency: periodic messages often 1–100 Hz depending on signal
- Bus termination: 2 × 120 Ω at ends of CAN network (check for 60 Ω across CAN_H/CAN_L if fully connected)
Diagnostic algorithm
- Retrieve all codes and freeze frame data from every network module. Note any other U‑codes or errors.
- Clear U0587 and related codes, then cycle ignition and test-drive to see if code returns and under what conditions.
- Verify vehicle battery and charging system voltage and stability; charge or replace battery if low.
- Inspect RATD physical connectors and harness: repair damaged wires, clean corroded terminals, reseat connectors.
- With a capable scan tool, confirm the RATD module appears on the bus, read its software/calibration IDs and compare to factory spec.
- Check for aftermarket modules or splices on the vehicle data bus and remove or isolate them for testing.
Likely causes
- Bad or intermittent connector/wiring to the Radiator Anti‑Tamper Device
- Radiator Anti‑Tamper Device producing corrupted or out‑of‑range messages
- Bus errors caused by poor termination, shorted CAN/LIN, or electrical noise
- Software mismatch or corrupted configuration in RATD or receiving module
- Low/unstable vehicle supply voltage affecting module communications
- Aftermarket accessories or recent repairs altering bus topology
Fault status
Status
Invalid data received from Radiator Anti‑Tamper Device — message format/checksum or timing/ID mismatch detected on vehicle data bus.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 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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