Code
B1152
Generic
B — Body
Body Control Module Communication Error
Views:
UK: 2
EN: 1
RU: 3
AI status
Completed
Completed
100%
Causes
- Loss of power or ground to the BCM (fuse, relay, battery, wiring)
- Damaged or corroded connectors at the BCM or other modules
- Open, shorted or high-resistance CAN/LIN wiring
- Failed BCM hardware
- Module in 'bus off' state due to repeated errors
- Incorrect or outdated software/calibration in BCM or other modules
Symptoms
- Warning lamp(s) related to body functions (doors, airbags, ABS) or generic communication warnings
- Loss or intermittent operation of central locking, lights, wipers, windows or instrument cluster
- No response from BCM-controlled features (remote key, interior lighting, HVAC controls)
- Multiple modules showing COMM or U-codes on scan tool
- Vehicle may go into limp/limited accessory mode
What to check
- Connect a capable scan tool and read all stored, pending and permanent codes across modules
- Note freeze-frame and time-of-occurrence conditions (battery voltage, ignition state)
- Check battery voltage and charging system; ensure good battery (≥12.2V resting, >12.6V running)
- Inspect BCM fuses, fusible links and relays; verify supply and ignition feeds at the BCM
- Visually inspect BCM and related harnesses/connectors for corrosion, water, damage or rodent chewing
- Check main ground(s) for BCM and body grounds for tightness and corrosion
Signal parameters
- CAN bus recessive level: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (both same)
- CAN bus dominant level: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ≈2.0 V)
- Termination resistance (both ends): ≈ 60 Ω between CAN_H and CAN_L
- Common CAN data rates: 250 kbps or 500 kbps (verify vehicle-specific rate)
- LIN or other serial lines (if used by BCM) typically idle at battery voltage through pull-up; verify per vehicle
Diagnostic algorithm
- Capture all module codes and network status with a full-system scan tool; record related U-codes.
- Check battery state and fuses/relays that feed the BCM; restore proper power if low or blown.
- Visually inspect BCM connector and harness for corrosion, bent pins, water, or rodent damage; repair as required.
- Verify primary and secondary grounds for BCM and associated body grounds; clean and tighten.
- With key ON, measure CAN_H and CAN_L at the BCM connector for proper idle voltages; compare to another module if available.
- Measure termination resistance across CAN lines; remove power and ensure ~60 Ω. If open or shorted, trace and repair wiring.
- Use a scope to view CAN waveforms while operating; look for missing messages, distorted edges, or stuck-dominant conditions.
- If a specific module is suspected to be flooding the bus, disconnect that module (or its connector) and re-check bus behavior and codes.
- Check for technical service bulletins (TSBs) or required software/calibration updates for the BCM or network modules; reflash if recommended.
- If wiring/power/grounds and other modules check OK and the BCM still fails to communicate, consider replacement of the BCM and program/configure per manufacturer procedure.
- After repair or module replacement, clear codes and verify normal operation of network and dependent systems; road-test and re-scan.
Likely causes
- Poor battery/ignition supply or weak battery causing intermittent comms
- Corroded or loose ground or BCM connector pins
- CAN bus short to voltage or ground, or missing termination resistor
- One failed module flooding the bus with errors (bus off possible)
- BCM internal fault (less common after wiring/power checks)
Fault status
Status
BCM communication fault recorded. Code may be active (current communication loss) or stored as history. Often accompanied by other U-codes indicating lost communications on the vehicle network. Verify power, ground, wiring and bus integrity before replacing the BCM.
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
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Code
B1152
HUMMER
B — Body
Data Area Full
Views:
UK: 6
EN: 18
RU: 11
AI status
Completed
Completed
100%
Causes
- Loss of power or ground to the BCM (fuse, relay, battery, wiring)
- Damaged or corroded connectors at the BCM or other modules
- Open, shorted or high-resistance CAN/LIN wiring
- Failed BCM hardware
- Module in 'bus off' state due to repeated errors
- Incorrect or outdated software/calibration in BCM or other modules
Symptoms
- Warning lamp(s) related to body functions (doors, airbags, ABS) or generic communication warnings
- Loss or intermittent operation of central locking, lights, wipers, windows or instrument cluster
- No response from BCM-controlled features (remote key, interior lighting, HVAC controls)
- Multiple modules showing COMM or U-codes on scan tool
- Vehicle may go into limp/limited accessory mode
What to check
- Connect a capable scan tool and read all stored, pending and permanent codes across modules
- Note freeze-frame and time-of-occurrence conditions (battery voltage, ignition state)
- Check battery voltage and charging system; ensure good battery (≥12.2V resting, >12.6V running)
- Inspect BCM fuses, fusible links and relays; verify supply and ignition feeds at the BCM
- Visually inspect BCM and related harnesses/connectors for corrosion, water, damage or rodent chewing
- Check main ground(s) for BCM and body grounds for tightness and corrosion
Signal parameters
- CAN bus recessive level: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (both same)
- CAN bus dominant level: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ≈2.0 V)
- Termination resistance (both ends): ≈ 60 Ω between CAN_H and CAN_L
- Common CAN data rates: 250 kbps or 500 kbps (verify vehicle-specific rate)
- LIN or other serial lines (if used by BCM) typically idle at battery voltage through pull-up; verify per vehicle
Diagnostic algorithm
- Capture all module codes and network status with a full-system scan tool; record related U-codes.
- Check battery state and fuses/relays that feed the BCM; restore proper power if low or blown.
- Visually inspect BCM connector and harness for corrosion, bent pins, water, or rodent damage; repair as required.
- Verify primary and secondary grounds for BCM and associated body grounds; clean and tighten.
- With key ON, measure CAN_H and CAN_L at the BCM connector for proper idle voltages; compare to another module if available.
- Measure termination resistance across CAN lines; remove power and ensure ~60 Ω. If open or shorted, trace and repair wiring.
- Use a scope to view CAN waveforms while operating; look for missing messages, distorted edges, or stuck-dominant conditions.
- If a specific module is suspected to be flooding the bus, disconnect that module (or its connector) and re-check bus behavior and codes.
- Check for technical service bulletins (TSBs) or required software/calibration updates for the BCM or network modules; reflash if recommended.
- If wiring/power/grounds and other modules check OK and the BCM still fails to communicate, consider replacement of the BCM and program/configure per manufacturer procedure.
- After repair or module replacement, clear codes and verify normal operation of network and dependent systems; road-test and re-scan.
Likely causes
- Poor battery/ignition supply or weak battery causing intermittent comms
- Corroded or loose ground or BCM connector pins
- CAN bus short to voltage or ground, or missing termination resistor
- One failed module flooding the bus with errors (bus off possible)
- BCM internal fault (less common after wiring/power checks)
Fault status
Status
BCM communication fault recorded. Code may be active (current communication loss) or stored as history. Often accompanied by other U-codes indicating lost communications on the vehicle network. Verify power, ground, wiring and bus integrity before replacing the BCM.
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
Similar codes
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