Code
B1557
HUMMER
B — Body
EEPROM Calibration Error
AI status
Completed
Completed
100%
Causes
- Corrupted EEPROM/calibration data inside the control module
- Interrupted or failed programming/flash operation (power loss during reflash)
- Low or unstable battery voltage during programming or normal operation
- Damaged wiring, poor power or ground to the affected module
- Water intrusion or physical damage to the module circuit board
- Software mismatch (wrong calibration file loaded) or incomplete dealer reflash
Symptoms
- One or more body systems fail to operate or behave erratically
- Related warning lights or DTCs for module communication
- Loss of saved settings (seat/mirror/memory), radio presets, or calibration items
- Vehicle may not complete certain relearns or immobilizer/pairing procedures
- Intermittent or permanent loss of CAN/bus communication to the module
What to check
- Read all stored DTCs and freeze frame data from all modules with a capable scan tool
- Verify battery state-of-charge and charging system health (>=12.4 V at rest; >=13.5–14.5 V running)
- Inspect power/ground pins and wiring at the module for corrosion, damage, or loose terminals
- Check for water intrusion or physical damage to the module housing/PCB
- Confirm recent service events (reflash/program) and whether programming completed successfully
- Verify VIN/calibration part numbers and software levels against factory data
Signal parameters
- Module supply voltage (VBATT) — should be stable during checks and programming
- Module ground continuity (near 0 ohms to chassis ground)
- CAN/LIN bus activity and ID presence for the affected module
- EEPROM/Calibration file checksum or CRC value reported by dealer tool (if available)
- Module wake/sleep state and ignition condition during reflash attempts
- Programming session status flags from factory tool (success/failure codes)
Diagnostic algorithm
- Record code(s) and complete vehicle history. Check for other related DTCs (communication or power faults).
- Verify battery is fully charged and the charging system is healthy. Use a battery conditioner if needed before programming.
- Inspect module connectors and harness for corrosion, bent pins, water damage or loose fasteners; repair as needed.
- Verify module power and ground circuits with a multimeter. Repair any open/poor connections.
- Use a factory-level scan tool to read module info: software/calibration IDs, EEPROM status, and any programming fault logs.
- Attempt to clear the code and cycle ignition. If code returns immediately, suspect persistent EEPROM corruption or hardware fault.
- If wiring/power/ground and bus are good, attempt controlled reflash/reprogram of the module using manufacturer software and correct calibration file. Follow vehicle-specific programming procedure (stable battery, battery maintainer, correct tool, proper ignition state).
- If reprogramming fails or reports EEPROM errors, attempt full module recover/restore procedure as specified by manufacturer (may include special erase/load steps).
- If recovery/programming cannot correct the EEPROM/calibration error, replace the affected control module with a new or reconditioned unit and program it with correct VIN/calibrations. Complete any required relearns (immobilizer, keys, sensors).
- After repair or reflash, clear codes, verify module communication and functionality, and perform a test drive or functional checks. Re-scan to confirm code does not return.
Likely causes
- Failed reprogramming attempt left EEPROM data invalid
- Weak battery or charging system problem during a previous service event
- Corroded/loose connector at the module causing intermittent power
- Module internal hardware fault (EEPROM chip failure)
Fault status
Status
EEPROM calibration data invalid or missing for the specified control module — module may be uncalibrated, corrupted, or require reprogramming/replacement.
Repair difficulty: Hard
Diagnostic time: 1-4 hours
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