Code
APP_W036
TESLA
Tesla Alert
Bdy Mia
Views:
UK: 14
EN: 18
RU: 14
AI status
Completed
Completed
100%
Causes
- Module powered down or no ground
- Damaged wiring or connector between module and CAN/LIN bus
- Bus short or open on CAN/LIN network
- Blown fuse or disabled power distribution to the module
- Module internal failure or firmware crash
- Recent module replacement or software update left module offline
Symptoms
- Warning or fault message on instrument cluster or infotainment
- One or more body systems inoperative (doors, lights, climate, locks, windows)
- No heartbeat/telemetry from body module in diagnostic tool
- Intermittent or permanent loss of features controlled by the body module
What to check
- Read full vehicle event and communication logs with factory-level diagnostic tool
- Confirm related fuse(s) and main power relays for the body module
- Visually inspect module connector(s) for corrosion, damage or loose pins
- Verify vehicle battery voltage is within normal range and connections are clean/tight
- Check recent software updates or repairs that may have affected module commissioning
- Scan other modules for related U-/B-codes to identify bus-wide issues
Signal parameters
- Module should present periodic heartbeat/keepalive messages on vehicle network (verify message ID and expected周期)
- CAN/LIN bus idle voltages: verify expected vehicle-specific nominal levels on CAN_H and CAN_L with key on
- Signal integrity: check for excessive bus error frames or fault counters in gateway/module logs
- Supply voltage to module (key-on and cranking) and ground resistance to chassis
Diagnostic algorithm
- Retrieve all codes and network logs from vehicle using Tesla/diagnostic tool; note timestamps and correlated events.
- Verify battery voltage and main power to body module; check and measure relevant fuses/relays. Replace or repair any blown/failed items.
- Perform visual inspection of module connector, harness and pins; repair corrosion/damage and reseat connector.
- With diagnostics connected, monitor CAN/LIN traffic; confirm whether the body module transmits its heartbeat and whether bus error frames are present.
- If no traffic from module but power/ground present, check continuity between module ground and chassis and measure supply voltage under load.
- If wiring and power are good, attempt a soft reset or wake/reboot procedure per manufacturer guidance; if available, reflash or re-apply firmware following Tesla service instructions.
- If module remains unresponsive after software procedures and wiring/power verified, consider swapping with a known-good module (if allowed) or replacing the module. Document configuration and pairing steps required after replacement.
- After repair, clear codes, verify restored communication and perform function tests for affected systems.
Likely causes
- Faulty module power/ground (fuse, connector, wiring)
- Intermittent or open communication on CAN/LIN bus (broken shield, corrosion, short)
- Module firmware hung or incompatible after update
- Failed or intermittent module
Fault status
Status
Body module not detected or not responding on vehicle communication network (lost/absent heartbeat).
Repair difficulty: Medium
Diagnostic time: 1.5 - 4.0 hours
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