U0331
Software Incompatibility With Body Control Module A
Network / communication
Generic OBD-II
Medium
What it means
U0331 means body control module A is running software that doesn't match the rest of the network — usually after a module swap or an interrupted reflash. Because the BCM manages lighting, locks, wipers, and other body electronics, several features may misbehave at once. The car generally still drives, but affected exterior lighting is a safety concern, so fix it promptly.
Medium
Can I keep driving? Usually yes, but expect glitches — the BCM runs lighting, locks, wipers, and more, so several convenience features may fail until the software mismatch is fixed.
Common symptoms
What you'll notice
- Multiple body-electrical faults: lighting, locks, wipers, windows, or interior features
- Warning lights on and other modules reporting lost communication with the BCM
- Intermittent or non-functioning convenience features
- Immobilizer or security behaving oddly if routed through the BCM
Common causes
Most likely first
- Body control module software doesn't match the network software levelLikely
- Replacement or used BCM installed without being programmed to the vehicleCommon
- Interrupted reflash or incomplete BCM configurationCommon
- Coding out of sync after another module was reprogrammedLess often
How to diagnose & fix
Work through it in order
- Scan all modules and confirm which software/part numbers are mismatched.
- Verify the BCM part number is correct for this VIN and options.
- Reflash or recode the BCM to the manufacturer-approved software level.
- Program the BCM to the vehicle if it was replaced, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with U0331?+
Usually yes, but the BCM controls many electrical features — lights, locks, wipers — so some may not work. If exterior lighting is affected, that's a safety concern; fix it promptly.
Can I just clear U0331?+
It returns until the software versions match. The BCM must be reprogrammed and configured to the vehicle to clear it for good.
Related codes
Often seen with U0331
Read & clear U0331 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX