The body control module (BCM) has detected an internal fault and may need to be replaced.
Low severity. Can I keep driving?You can normally keep driving. If it affects the lights or visibility, get it repaired before driving at night or in the rain.
Symptoms
- Warning light or symbol related to the affected system
- Comfort or safety function impaired
Most likely causes
- BCM internal hardware fault
- Voltage spike damage from jump-start
- Water intrusion at module
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: hard
What each character of B0990 means
- B: Body
- 0: Generic code: same on every make
- 9: Subsystem depends on the code range
- 90: Specific fault in that system
Frequently asked questions
Can I keep driving with code B0990?
You can normally keep driving. If it affects the lights or visibility, get it repaired before driving at night or in the rain.
What causes code B0990?
The most common causes are: bCM internal hardware fault; voltage spike damage from jump-start; water intrusion at module.
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.