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Home / DTC / U0145 — Lost Communication With Body Control Module E

U0145 — Lost Communication With Body Control Module E

Detailed page for trouble code U0145.

32,685codes
59brands
10,228generic
22,457specific
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Code

U0145

Generic U — Network/User

Lost Communication With Body Control Module E

Brand: Generic
Type: U — Network/User
Views: UK: 13 EN: 19 RU: 13
AI status
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Page language: EN

Causes

  • BCM E internal failure
  • Loss of BCM power or ground (blown fuse, poor ground, open/short)
  • Damaged or corroded BCM connector or pins
  • Open, shorted or crossed CAN / data-bus wiring
  • Bus driven to a dominant state by another module (bus-off condition)
  • Aftermarket accessories or recent repairs that disturbed the network

Symptoms

  • Warning message(s) on cluster: “No Communication With BCM” or similar
  • Loss or erratic operation of body functions (door locks, lights, wipers, interior lights, keyless entry)
  • Security/immobilizer or remote functions not working
  • Multiple network-related DTCs present
  • Possible battery drain if BCM stuck in an abnormal state

What to check

  • Connect a professional scan tool and confirm U0145 is current or historic; capture freeze frame and related network codes
  • Check battery voltage and charging system condition
  • Inspect fuses/relay for BCM power and accessory feeds
  • Visually inspect BCM connector for corrosion, bent pins, water intrusion
  • Verify proper ground(s) at BCM with low-resistance test
  • Measure CAN_H and CAN_L voltages at BCM connector with ignition on

Signal parameters

  • CAN recessive voltage: both CAN_H and CAN_L roughly 2.5 V (each) at idle
  • CAN dominant voltages: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V during dominant bits
  • Typical bus baud rates: 125 kbps, 250 kbps, 500 kbps or 1 Mbps (vehicle-specific)
  • BCM heartbeat/keepalive message: periodic broadcast (comm interval commonly 100–1000 ms; exact ID/manufacturer-specific)
  • Expected low RX/TX error counters; high CRC/frame error counts or bus-off state indicate network faults

Diagnostic algorithm

  1. Use a scan tool to attempt communication with BCM E and note related codes/time stamps.
  2. Check battery voltage (should be >12.4 V at rest) and verify charging system. Low voltage can corrupt communications.
  3. Inspect BCM power/ground fuses and relays; verify fused feeds are present at BCM pins with ignition ON and OFF as required.
  4. Visually inspect the BCM connector for damage, corrosion, bent pins or water intrusion; repair connector issues before further diagnosis.
  5. With ignition ON, measure DC voltage at BCM power and ground terminals and verify within factory spec (usually battery voltage at power pin, near 0 Ω to chassis at ground).
  6. Measure CAN_H and CAN_L at the BCM connector and at another known-good node. Compare readings. Look for recessive ~2.5 V on both lines and correct dominant voltages when active.
  7. Use an oscilloscope or CAN bus analyzer to observe message traffic and error frames. Look for bus-off state, repeated dominant bits, or one line shorted to voltage/ground.
  8. If one module is causing the bus fault, disconnect suspected modules (starting with aftermarket devices) one at a time and re-check bus behavior and communication.
  9. If wiring and power/ground are good but no comms, try re-initializing or reflashing BCM software per manufacturer procedures; confirm correct part number and calibration.
  10. If BCM is confirmed failed after elimination of wiring/power and other modules, replace BCM and program/configure with OEM tool. Clear codes and retest all body functions and network health.
  11. After repair, road test and re-scan to ensure code does not return and that no related network codes are present.

Likely causes

  • Loose/poor ground or fused power to the BCM
  • Short to ground or battery on CAN_H or CAN_L at or near BCM
  • Failed BCM (intermittent or permanent)
  • Other module on same bus causing bus-off or heavy errors
  • Connector corrosion or bent pins at BCM

Fault status

⚠️ Status
U0145 - Lost Communication With Body Control Module E: BCM E not responding on data bus. Check BCM power/ground, connector, and CAN bus for faults.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours
Workshop Manuals

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