Code
ADSP_W039
TESLA
Tesla Alert
Anc Ping
AI status
Completed
Completed
100%
Causes
- Missing or late heartbeat message from an ancillary module
- Intermittent network communication on vehicle Ethernet/CAN bus
- Loose, corroded or damaged connectors/cables
- Insufficient or unstable module supply voltage
- Software/firmware mismatch or recent update
- Faulty ancillary module or ADSP hardware
Symptoms
- Driver display message or system warning related to ancillary functions
- Intermittent or total loss of the affected ancillary feature (audio, sensors, etc.)
- Features working after vehicle reboot then failing again
- Other network communication errors or related DTCs present
- Unusual latency or dropouts in dependent systems
What to check
- Read and save all vehicle fault codes and freeze frame data with a factory-level scanner
- Check for recent software updates or incomplete flashes
- Inspect connectors and harnesses for corrosion, bent pins, or damage
- Verify vehicle battery state-of-charge and module supply voltages at key connectors
- Check in-vehicle network components (Ethernet switch, CAN transceivers) for faults
- Reboot the system (soft reboot) and see if the ADSP_W039 clears or returns
Signal parameters
- Heartbeat/ping message frequency: typically periodic (example: 1 Hz) — verify expected rate for specific module
- Timeout threshold: number of missed pings before setting warning (manufacturer specific)
- Message type: heartbeat/keepalive on vehicle network (Ethernet/CAN) — message ID and payload structure are OEM-specific
- Supply voltage at affected module: nominal operating voltage (verify within spec during fault)
Diagnostic algorithm
- Record all related DTCs and timestamps using factory diagnostic tool; note any patterns (after start, during driving, on wake, etc.).
- Reboot vehicle/system to see if the code clears and whether the fault is persistent. If transient and does not recur, monitor for recurrence.
- Verify recent software/firmware history. If a recent update occurred, confirm successful flash and correct versions on ADSP and ancillary modules.
- Inspect physical connections: disconnect, inspect, clean and reseat connectors for ADSP and ancillary modules; check for damaged wiring or pins.
- Measure and record supply voltages at module power/ground while fault is present and during normal operation; look for drops or instability.
- If available, capture network traffic (Ethernet/CAN) and verify heartbeat messages are being sent and received at expected intervals; identify message loss or corruption.
- Swap or bypass suspect network components (Ethernet switch, gateway) if possible to isolate the failing path.
- If hardware fault suspected, test/replace the ancillary module or ADSP per manufacturer procedure. Re-run diagnostics and verify the issue is resolved.
- After repair or software changes, clear codes and perform a road/functional test to confirm stability.
Likely causes
- Loose connector or damaged harness between ADSP and ancillary module
- Module rebooting or stuck due to firmware issue
- Low battery/voltage drop at key module during operation
- Corrupted network packet path (failed Ethernet switch or bridge)
- Intermittent module hardware failure
Fault status
Status
Ancillary ping (heartbeat) not received by ADSP — communication timeout (ADSP_W039). Investigate network, power, connectors, and module software/hardware.
Repair difficulty: Medium
Diagnostic time: 1.5 - 3.0 hours
Similar codes
Repair manuals
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