Code
ADSP_W027
TESLA
Tesla Alert
Eth Udp Err
AI status
Completed
Completed
100%
Causes
- Damaged or intermittent Ethernet cable, connector, or shield
- Faulty or poorly seated network switch/bridge or inline device
- Grounding or power quality issues causing bit errors
- ECU/module hardware failure (transceiver, PHY, or processor)
- Firmware/software bug or protocol/configuration mismatch (IP/port/MTU)
- Excessive network congestion or traffic storm
Symptoms
- Intermittent or persistent ADAS/autonomy feature degradation or unavailability
- Logged UDP/ Ethernet errors and repeated ADSP_W027 events in diagnostic log
- Increased latency between modules or timeouts for UDP-based services
- Module rebooting, falling back to a safe state, or degraded performance
- Loss of telemetry, sensor fusion errors, or partial data streams
What to check
- Retrieve full diagnostic log and event timestamps related to ADSP_W027
- Verify software/firmware versions on ADSP and communicating modules
- Visually inspect Ethernet connectors, pins, seals, and cable routing for damage, chafing, corrosion, or moisture
- Check physical layer with an Ethernet cable tester for continuity, pair integrity, and shield continuity
- Inspect/replace any inline switches, PoE injectors, or connectors and re-test
- Measure supply voltages and grounds at affected modules for stability
Signal parameters
- UDP packet loss rate (%) — expected near 0% on vehicle networks
- UDP checksum error count (counts per minute/hour)
- Average latency (ms) and jitter between ADSP and peer module
- Frame error/CRC error counts on Ethernet PHY (link statistics)
- Link speed/duplex mismatches (100/1000 Mbps, full/half) and negotiated parameters
- Port numbers and IP addresses involved (for targeted packet captures)
Diagnostic algorithm
- Record: Save the ADSP and network logs showing ADSP_W027 with timestamps and VIN.
- Reproduce: Attempt to reproduce under similar operating conditions (drive cycle or bench test with load).
- Firmware: Confirm all related modules run manufacturer-recommended firmware. If not, update per service instructions.
- Physical inspection: Inspect connectors, harness routing, and shields. Reseat connectors and check for corrosion or damage.
- Cable test: Use an Ethernet cable tester or continuity meter; replace suspect cables and retest for the fault.
- Isolate network: Temporarily bypass or replace inline switches/bridges; test direct point-to-point connection between ADSP and peer module.
- Packet capture: Perform a packet capture (PCAP) on the relevant link to identify UDP checksum failures, malformed packets, excessive retransmits, or unexpected ports/addresses.
- Power/ground: Check module supply voltages and ground continuity while reproducing the fault to detect noise or drops.
- Swap/replace: If physical layer and configuration appear OK, swap the ADSP or the peer module with a known-good unit if available, or replace the suspect module following workshop procedures.
- Confirm: Clear codes, perform the relevant functional test/road test, and verify no recurrence and correct network performance.
Likely causes
- Physical layer problem: damaged cable, bent pins, corroded connector, or shield broken
- Network device (switch, Ethernet PHY) failing intermittently
- Module firmware mismatch or regression causing malformed UDP packets
- Ground or supply noise causing transient packet corruption
- High traffic load causing packet loss or dropped UDP datagrams
Fault status
Status
UDP-layer Ethernet errors detected between ADSP and peer module — packet loss, checksum or malformed UDP frames. Inspect physical network, module firmware/configuration, and related hardware.
Repair difficulty: Medium
Diagnostic time: 1.5 - 4 hours
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