U0587

Code

Generic U — Network/User

Invalid Data Received From With Radiator Anti Tamper Device

Brand: Generic

Type: U — Network/User

Views: UK: 20 EN: 23 RU: 24

AI status

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Page language: EN

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)

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

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)

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.