Code
APP_W051
TESLA
Tesla Alert
Radc Ecu Issue
AI status
Completed
Completed
100%
Causes
- ECU internal fault or corrupted firmware.
- Loss of CAN/LIN communication to the RADC module.
- Low or missing power supply or poor ground to the ECU.
- Blown fuse or faulty power distribution to the module.
- Intermittent or corroded connector or wiring (water ingress, pin corrosion).
- Related sensor or peripheral fault causing the ECU to enter a fail-safe state.
Symptoms
- Warning message or indicator related to RADC/ECU present on dash or center display.
- Loss or degradation of functions controlled by the RADC module (depending on module role).
- Related modules reporting communication timeouts or multiple network faults.
- Stored DTC(s) referencing RADC or network communication issues.
- Intermittent operation that may return after vehicle power-cycle or battery disconnect.
What to check
- Read all stored and pending fault codes with manufacturer diagnostic tool; save logs and freeze-frame data.
- Check for additional network codes (U-codes) that indicate CAN/LIN loss.
- Visually inspect RADC ECU connector for corrosion, bent pins, moisture, or foreign debris.
- Verify fuses/relays related to the RADC power feed; measure continuity and correct fuse values.
- Measure supply voltage at the ECU power pins with ignition in required state (expected ~11–15 V for 12V systems).
- Measure ground integrity at ECU ground pins (low resistance to chassis).
Signal parameters
- Supply voltage at ECU pins (expected ~11–15 V for 12V systems).
- Ground resistance (expected low ohms to chassis).
- CAN high/low idle voltages (approx. CAN idle differential; bus dominant/recessive behavior).
- CAN message rate/IDs for the RADC module (should be present and stable).
- Module wake/sleep signal status and wake-up timing.
- Diagnostic session response (UDS/Service availability, positive response codes).
Diagnostic algorithm
- Capture full fault list and vehicle logs using Tesla diagnostic tools; note time stamps and correlated events.
- Check for related U- and B-codes to determine if issue is isolated or network-wide.
- Visually inspect ECU harness and connector for water damage, corrosion, or mechanical damage; repair as needed.
- Verify fuses/relays and measure battery/ignition supply at the ECU with connector connected and ignition in required state.
- Measure ground continuity from module ground pin to chassis and battery negative.
- Check CAN bus physical layer: verify voltages on CAN_H/CAN_L, message presence with a scope or bus analyzer, and correct termination resistances.
- If wiring and power/ground are good, attempt a manufacturer-approved ECU software reflash or configuration restore.
- If ECU still faults after verified power, ground, network and correct firmware, consider ECU replacement following OEM procedures and programming.
- After any repair or replacement clear codes, perform full system re-check and road test to confirm fault does not return.
- Document findings, parts replaced, and confirm software levels match vehicle configuration.
Likely causes
- Corroded or loose connector at the RADC ECU.
- Interrupted CAN bus (open, short, or termination fault).
- Low vehicle 12V supply or bad ground at the module.
- ECU internal hardware or firmware fault requiring reflash or replacement.
- Blown fuse or faulty power relay feeding the ECU.
Fault status
Status
RADC ECU reported an internal fault or failed communication. Check power, ground, connectors, CAN network and firmware before considering replacement.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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