U0033 — Vehicle Communication Bus A (-) Open

What Does U0033 Mean?

U0033 is a diagnostic trouble code indicating: Vehicle Communication Bus A (-) Open. This code relates to the network communication system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

What To Do Next

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

Related Codes

U0028 Vehicle Communication Bus A U0029 Vehicle Communication Bus A Performance U0030 Vehicle Communication Bus A (+) Open U0031 Vehicle Communication Bus A (+) Low U0032 Vehicle Communication Bus A (+) High U0034 Vehicle Communication Bus A (-) Low U0035 Vehicle Communication Bus A (-) High U0036 Vehicle Communication Bus A (-) shorted to Bus A (+)