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Home / DTC / B0150 — Body Control Module Internal Fault

B0150 — Body Control Module Internal Fault

Detailed page for trouble code B0150.

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B0150

Generic B — Body

Body Control Module Internal Fault

Brand: Generic
Type: B — Body
Views: UK: 9 EN: 9 RU: 6
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Page language: EN

Causes

  • Internal BCM hardware failure (failed IC, solder joint, PCB trace)
  • Corrupted BCM software/firmware
  • Intermittent or low battery voltage / poor power supply
  • Poor ground or high resistance in ground circuit
  • Corroded or damaged connectors or wiring to BCM
  • Moisture/water intrusion or physical damage to module

Symptoms

  • Multiple body systems inoperative or intermittent (door locks, interior lights, exterior lights, wipers, HVAC controls)
  • One or more modules show communication loss with BCM on diagnostic tool
  • Erratic operation of convenience features (random relays switching, incorrect lighting behavior)
  • Parasitic battery drain when vehicle is off
  • Warning lamps or message center errors related to body systems
  • Vehicle may not enter keyless/remote functions or fail to sleep properly

What to check

  • Read DTCs and freeze frame data with a capable scan tool and save reports
  • Verify battery state-of-charge and resting voltage (12.4–12.8 V typical); check battery terminals and cable condition
  • Inspect fuses and BCM power/ignition circuits for blown fuses or fusible links
  • Visually inspect BCM connectors and wiring harness for corrosion, bent pins, water intrusion or physical damage
  • Check chassis ground(s) and measure voltage drop during cranking and at rest
  • Attempt to communicate with BCM using scan tool; note any intermittent responses or timeouts

Signal parameters

  • BCM supply voltage: nominal ~12 V with ignition off/on (should remain stable within vehicle spec)
  • Ground voltage drop: chassis ground to battery negative should be low (
  • CAN/LIN bus communication: module should respond to diagnostic requests; CAN recessive voltage ~2.5 V per bus line and differential present (verify with scope or CAN tester)
  • Wake/sleep control signals: BCM should detect and generate wake/sleep messages on network and control lines
  • Quiescent current: BCM sleep current typically very low (microamp to low milliamp range) — unusually high values indicate internal fault
  • Internal self-test status: module may report FAIL states or internal error counters via diagnostics

Diagnostic algorithm

  1. Retrieve all related DTCs and freeze frame; record module information (part number, software/calibration ID)
  2. Verify vehicle battery SOC and charging system; restore full battery voltage and retest to rule out low-voltage artifacts
  3. Inspect all BCM fuses, power feeds and ground connections; clean/repair/replace corroded connectors and retest communication
  4. Measure BCM supply and ground at the module connector while monitoring for voltage drops, spikes or intermittent loss
  5. Check CAN/LIN physical layer: measure bus voltages, verify termination resistances and continuity to other modules
  6. If module communication is intermittent, wiggle-test harness (with battery disconnected as needed) and inspect for damaged wiring
  7. Check for water intrusion or physical damage to the BCM housing; if present, repair wiring and consider module replacement
  8. Verify latest software/firmware level and apply manufacturer updates or reflashes per service procedure; perform module reset/relearn if permitted
  9. If all external circuits and software are verified good and fault remains, consider bench-testing/repair or replacing the BCM and program/configure with correct vehicle keys, VIN and options
  10. After repair or replacement, clear DTCs and perform full system checks and road test to confirm resolution

Likely causes

  • Battery voltage drop or unstable supply to BCM (low battery, bad battery cables, weak alternator)
  • Poor or corroded ground at BCM chassis ground point
  • Connector corrosion, bent pins or water damage at BCM housing
  • Software/firmware corruption or failed module self-test
  • Age-related internal component failure on BCM PCB

Fault status

⚠️ Status
BCM internal fault detected. Module self-test failed or internal error reported; may cause multiple body system malfunctions or loss of network communication.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

B0100 B0110 B0151 U0100 U0073
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