U0027 — Low Speed CAN Communication Bus (-) shorted to Bus (+)

What Does U0027 Mean?

U0027 is a diagnostic trouble code indicating: Low Speed CAN Communication Bus (-) shorted to Bus (+). 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

U0022 Low Speed CAN Communication Bus (+) Low U0023 Low Speed CAN Communication Bus (+) High U0024 Low Speed CAN Communication Bus (-) Open U0025 Low Speed CAN Communication Bus (-) Low U0026 Low Speed CAN Communication Bus (-) High U0028 Vehicle Communication Bus A U0029 Vehicle Communication Bus A Performance U0030 Vehicle Communication Bus A (+) Open