OBD · Communication network
U0073 Control module communication bus off
What this code means
U0073 is a generic OBD code shared by all manufacturers since 2001 for petrol and 2004 for diesel. It relates to: communication network. The code tells you what the ECU measured as abnormal, not necessarily which part to replace.
Most common causes
This code has too many model-specific causes to rank reliably. A scan with your symptoms narrows it down.
How to read this code
An OBD scanner plugged into the 16-pin socket under the steering wheel reads and clears codes. Bluetooth models cost £20 to £40. Clearing a code without fixing the fault is pointless: it comes back.
Frequently asked questions
What does code U0073 mean?
U0073: Control module communication bus off. U0073 is a generic OBD code shared by all manufacturers since 2001 for petrol and 2004 for diesel. It relates to: communication network. The code tells you what the ECU measured as abnormal, not necessarily which part to replace.
Can I drive with code U0073?
Fix soon. Drive gently and as little as possible. The fault can get worse and damage other parts.
How to read this code
An OBD scanner plugged into the 16-pin socket under the steering wheel reads and clears codes. Bluetooth models cost £20 to £40. Clearing a code without fixing the fault is pointless: it comes back.