B1000: Electronic control unit (ECU) internal performance
Drive carefully. Get it checked within a week or two.
Can I drive with B1000?
Yes, but drive carefully and get it checked soon. Body control module internal error; interior lights, wipers, or locks may misbehave. Meaning can vary by make and model.
What does B1000 mean?
B1000 stands for Electronic Control Unit (ECU) Internal Performance (Body Module).
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 B1000 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:
- Body Control Module (BCM) internal memory error
- Low battery voltage or jump-start power spike
- Poor BCM ground or corroded module connector
- Water damage from windshield/sunroof drain leak
What to do next
- Check 12V battery health and charge level.
- Disconnect battery for 15 minutes to reset the body computer.
- Check interior fuse box area for signs of water leakage.
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 B1000 means the Body Control Module (BCM) has suffered an internal self-check failure. The BCM operates door locks, turn signals, power windows, and interior lighting. The vehicle usually remains drivable, though interior accessories may behave erratically.