Code
B3060
HUMMER
B — Body
Security System Sensor Data Incorrect but Valid
AI status
Completed
Completed
100%
Causes
- Intermittent or corroded wiring/connectors between sensors and the security module
- Faulty security sensor (door/hood/trunk latch, motion sensor, tilt sensor, keyless entry receiver)
- Poor or intermittent ground at the security/BCM module
- Low vehicle battery voltage or weak key fob battery affecting transmissions
- Software/firmware mismatch or module memory error
- Radio frequency (RF) interference or conflicting aftermarket devices (alarms, remote starters)
Symptoms
- Security/anti-theft warning lamp illuminated or flashing
- Alarm arms/disarms unpredictably or will not arm
- Keyless entry or remote start does not work reliably
- Vehicle may crank but not start (immobilizer active) or starting prevented intermittently
- Stored intermittent DTCs related to security sensors or modules
What to check
- Read DTCs and freeze frame with a capable scan tool; record all related B- and U- codes
- Check vehicle and key fob battery voltages
- Inspect connectors and wiring at door/hood/trunk sensors and security/BCM module for corrosion, bent pins, water intrusion
- Verify good ground at module chassis ground point
- Check for recent aftermarket installations (alarms, remote starters) and disconnect for test
- Attempt to reproduce fault while monitoring live data for sensor states and CAN messages
Signal parameters
- Sensor supply voltage: typically 5 V (0-5 V analog ranges expected)
- Digital sensor states: open/closed, 0 or 1 logic levels reported over CAN
- CAN bus data: security module status messages and sensor flags (monitor for dropped/invalid frames)
- Key fob RF: rolling code ID present and stable when button pressed (no excessive repeats)
- Ground continuity: low ohms between module ground and battery negative
Diagnostic algorithm
- Retrieve all stored and pending codes from all modules; note freeze-frame and occurrence counts. Do not clear yet.
- Check battery voltage (engine off and cranking) and key fob battery; confirm within nominal range. Charge or replace as needed.
- Visually inspect connectors and harnesses for the security sensors and module; repair any corrosion, damage, or loose pins.
- Using a scan tool, monitor the specific sensor data/flags while operating the related component (open/close door, hood, trunk, press key fob). Confirm sensor transitions are clean and match physical state.
- Check module grounds and power feeds for continuity and proper voltage under load. Repair poor grounds.
- If a sensor shows noisy or borderline analog values, measure the sensor circuit with a multimeter/oscilloscope to confirm correct voltage ranges and absence of noise.
- Disconnect aftermarket devices to rule out interference. If present, test vehicle without them installed.
- If wiring and sensors test good, try clearing codes and performing any required relearn procedures (key relearn, BCM/module initialization) per manufacturer instructions; then attempt to reproduce.
- If fault remains intermittent and all wiring/sensors are good, consider reprogramming or replacing the security/BCM module per dealer guidance.
- After repairs, clear codes and perform a full system test over several ignition cycles and real-world use to confirm no recurrence.
Likely causes
- Damaged harness or pin pushed out at the security module connector
- Failed door latch or lock position sensor giving noisy/unstable data
- Weak vehicle battery causing sporadic CAN or module resets
- Key fob transmitter low battery or faulty receiver module
- Recent battery replacement or module reprogramming not completed (missing relearn)
Fault status
Status
Security system reported sensor data inconsistent with internal validation checks. Data values are within range but flagged as invalid or out-of-sequence. May cause alarm, entry, or immobilizer malfunctions.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Similar codes
Repair manuals
Manual library for HUMMER
138
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