Code
B2780
Generic
B — Body
Body Control Module — Configuration/Memory Error
Views:
UK: 24
EN: 26
RU: 27
AI status
Completed
Completed
100%
Causes
- Corrupted BCM software or calibration data
- Failed or interrupted module programming/update (power loss during reflash)
- Internal BCM memory or processor failure
- Low or unstable vehicle battery/charging system during programming
- Poor electrical connections, damaged wiring, or corroded BCM connectors
- Water intrusion or physical damage to BCM
Symptoms
- BCM-related functions inoperative or intermittent (door locks, lights, wipers, interior lamps, power windows, etc.)
- Multiple body/network module warnings or error messages on dash
- Settings (clock, radio presets, user preferences) reset or missing
- Remote keyless entry or immobilizer faults
- Battery drain or parasitic draw in some cases
- Related communication DTCs (CAN/lin bus) may also be present
What to check
- Read all stored DTCs and freeze frame data from the BCM and other modules (scan tool with manufacturer-level access recommended)
- Check battery voltage and charging system (stable 12.6V+ at rest; >13.5V when running). Verify battery was not discharged during last programming attempt
- Inspect BCM connectors for corrosion, bent pins, water damage, or loose retainers
- Check fuses and power/ground circuits to BCM for proper continuity and secure grounds
- Scan the vehicle network for missing or non-responsive modules (U0xxx codes)
- Review vehicle service history for recent BCM replacement or software updates
Signal parameters
- Battery/supply voltage to BCM (key off and key on)
- Ground continuity and resistance at BCM ground pins
- CAN high/low bus voltages and differential signal activity during cranking and normal operation
- Presence of expected module addresses on network scan and responses to diagnostic requests
- Status of BCM internal counters/flash memory errors if available from OEM scan tool
Diagnostic algorithm
- Connect a full-function scan tool and read all modules; record B2780 and any related U0xxx/B1xxx codes. Clear codes and see if B2780 returns.
- Verify battery state-of-charge and charging system. If low, charge or replace battery and retest. Do not attempt programming with low battery.
- Inspect BCM physical condition and harness: check for corrosion, water ingress, damaged pins, loose connectors, and secure grounds. Repair any wiring issues found.
- Check for aftermarket accessories on the CAN bus (alarms, remote starters). Temporarily disconnect them and re-scan.
- Verify power and ground circuits to BCM with meter. Repair poor connections or replace blown fuses.
- Use scanner to check CAN bus topology and module responses. If BCM does not respond or shows memory errors, attempt to re-establish communication with OEM tool.
- If configuration data corrupted and hardware responsive, attempt official reprogramming/reflashing of BCM software/config using manufacturer-approved tool and files. Follow battery maintenance/recommended power supply procedures during reflash.
- If reflash fails or BCM reports persistent internal memory errors, replace BCM with correct part number. Perform required module coding/personalization and reinitialize vehicle settings (key re-learn, immobilizer sync, user preferences) per manufacturer procedure.
- After repair/programming, clear codes and perform network scan. Road test and monitor for reappearance of B2780 and related faults.
Likely causes
- Battery was low or disconnected during a recent software update or module replacement
- Aftermarket accessory or alarm interfering with the CAN bus or BCM configuration
- BCM connector pins corroded or damaged causing intermittent memory write errors
- BCM hardware failure (flash memory corruption) after an electrical event
- Incomplete or incorrect module programming/calibration after replacement
Fault status
Status
BCM reports configuration or memory integrity error. Module either holds corrupted configuration data or cannot retain/verify calibration. May result in disabled or unpredictable body control features and related communication faults.
Repair difficulty: Medium
Diagnostic time: 1.5-4.0 hours
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Code
B2780
HUMMER
B — Body
Wrong Resistor Before Good
Views:
UK: 31
EN: 33
RU: 29
AI status
Completed
Completed
100%
Causes
- Corrupted BCM software or calibration data
- Failed or interrupted module programming/update (power loss during reflash)
- Internal BCM memory or processor failure
- Low or unstable vehicle battery/charging system during programming
- Poor electrical connections, damaged wiring, or corroded BCM connectors
- Water intrusion or physical damage to BCM
Symptoms
- BCM-related functions inoperative or intermittent (door locks, lights, wipers, interior lamps, power windows, etc.)
- Multiple body/network module warnings or error messages on dash
- Settings (clock, radio presets, user preferences) reset or missing
- Remote keyless entry or immobilizer faults
- Battery drain or parasitic draw in some cases
- Related communication DTCs (CAN/lin bus) may also be present
What to check
- Read all stored DTCs and freeze frame data from the BCM and other modules (scan tool with manufacturer-level access recommended)
- Check battery voltage and charging system (stable 12.6V+ at rest; >13.5V when running). Verify battery was not discharged during last programming attempt
- Inspect BCM connectors for corrosion, bent pins, water damage, or loose retainers
- Check fuses and power/ground circuits to BCM for proper continuity and secure grounds
- Scan the vehicle network for missing or non-responsive modules (U0xxx codes)
- Review vehicle service history for recent BCM replacement or software updates
Signal parameters
- Battery/supply voltage to BCM (key off and key on)
- Ground continuity and resistance at BCM ground pins
- CAN high/low bus voltages and differential signal activity during cranking and normal operation
- Presence of expected module addresses on network scan and responses to diagnostic requests
- Status of BCM internal counters/flash memory errors if available from OEM scan tool
Diagnostic algorithm
- Connect a full-function scan tool and read all modules; record B2780 and any related U0xxx/B1xxx codes. Clear codes and see if B2780 returns.
- Verify battery state-of-charge and charging system. If low, charge or replace battery and retest. Do not attempt programming with low battery.
- Inspect BCM physical condition and harness: check for corrosion, water ingress, damaged pins, loose connectors, and secure grounds. Repair any wiring issues found.
- Check for aftermarket accessories on the CAN bus (alarms, remote starters). Temporarily disconnect them and re-scan.
- Verify power and ground circuits to BCM with meter. Repair poor connections or replace blown fuses.
- Use scanner to check CAN bus topology and module responses. If BCM does not respond or shows memory errors, attempt to re-establish communication with OEM tool.
- If configuration data corrupted and hardware responsive, attempt official reprogramming/reflashing of BCM software/config using manufacturer-approved tool and files. Follow battery maintenance/recommended power supply procedures during reflash.
- If reflash fails or BCM reports persistent internal memory errors, replace BCM with correct part number. Perform required module coding/personalization and reinitialize vehicle settings (key re-learn, immobilizer sync, user preferences) per manufacturer procedure.
- After repair/programming, clear codes and perform network scan. Road test and monitor for reappearance of B2780 and related faults.
Likely causes
- Battery was low or disconnected during a recent software update or module replacement
- Aftermarket accessory or alarm interfering with the CAN bus or BCM configuration
- BCM connector pins corroded or damaged causing intermittent memory write errors
- BCM hardware failure (flash memory corruption) after an electrical event
- Incomplete or incorrect module programming/calibration after replacement
Fault status
Status
BCM reports configuration or memory integrity error. Module either holds corrupted configuration data or cannot retain/verify calibration. May result in disabled or unpredictable body control features and related communication faults.
Repair difficulty: Medium
Diagnostic time: 1.5-4.0 hours
Similar codes
Repair manuals
Manual library for HUMMER
69
Browse 69 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
HUMMER
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