U0045
Vehicle Communication Bus B (-) shorted to Bus B (+)
U0045 is an OBD-II diagnostic trouble code meaning: Vehicle Communication Bus B (-) shorted to Bus B (+). Common causes: damage to the can bus wiring harness, short circuit in one of the modules. Estimated repair cost: $6–56.
Symptoms
- Unstable engine operation
- Failure of various vehicle systems
- Check Engine Light Is On
- Problems starting the engine
- Lost connection with diagnostic equipment
Causes
- Damage to the CAN bus wiring harness
- Short circuit in one of the modules
- Corrosion of connector contacts
- Mechanical damage to wiring
- Control unit malfunction
How to Fix
- Visual inspection of the CAN bus wiring harness
- Checking the resistance between CAN B+ and CAN B- lines
- Disabling modules one by one to identify faults
- Replacing damaged wires or connectors
- Repair or replacement of a faulty module
Related codes
Error U0045 by Vehicle Brand
FAQ
What does the U0045 code mean?
U0045 is an OBD-II diagnostic trouble code that indicates: Vehicle Communication Bus B (-) shorted to Bus B (+)
What causes a U0045 error code?
The most common causes of U0045 include: Damage to the CAN bus wiring harness; Short circuit in one of the modules; Corrosion of connector contacts; Mechanical damage to wiring.
How do I fix a U0045 diagnostic trouble code?
To fix U0045: Visual inspection of the CAN bus wiring harness. Checking the resistance between CAN B+ and CAN B- lines. Disabling modules one by one to identify faults. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0045?
Do not drive — repair immediately
How much does it cost to fix U0045?
The estimated repair cost for U0045 is $6–56. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat