B1001: Option configuration error / module mismatch
Drive carefully. Get it checked within a week or two.
Can I drive with B1001?
Yes, but drive carefully and get it checked soon. Body computer is not configured to match the vehicle VIN or installed equipment. Meaning can vary by make and model.
What does B1001 mean?
B1001 stands for Option Configuration Error / SDM Mismatch.
Symptoms you may notice
- Interior electrical accessory malfunction (locks, wipers, or climate buttons)
- Battery voltage warning or rapid battery drain while parked
- Key chip not recognized warning chime
How much does it cost to fix?
Repair costs for code B1001 depend on the specific underlying root cause, ranging from simple DIY checks to component replacement. The table below lists the most common causes and rough price ranges in USD:
- Replacement module installed without VIN programming
- Corrupted configuration memory after dead battery
- Mismatched airbag or instrument cluster module
- Software calibration glitch
What to do next
- Have a dealership or locksmith reprogram module configuration with factory scan tool.
- Ensure battery is fully charged.
- Clear codes and test all body functions.
Last updated: October 2026
Related codes
General guidance only, not a professional diagnosis. If the check-engine light is flashing, or the car is running rough, overheating or losing power, stop driving and get help.
About this code
Code B1001 occurs when a body module or airbag module detects a mismatch between its internal settings and the vehicle VIN. It commonly appears after installing a used junkyard part without dealer re-programming. The car can be driven to a programming technician.