U0046
Vehicle Communication Bus C
U0046 is an OBD-II diagnostic trouble code meaning: Vehicle Communication Bus C. Common causes: open or short circuit in the communication bus circuit, wiring harness damage. Estimated repair cost: $6–56.
Symptoms
- Check Engine light comes on
- Malfunctions in the operation of various vehicle systems
- Problems with data transfer between modules
- Reduced engine performance
- Errors in the operation of electronic systems
Causes
- Open or short circuit in the communication bus circuit
- Wiring harness damage
- Fault in one of the modules connected to the bus
- Problems with contacts in connectors
- Corrosion or oxidation of contacts
How to Fix
- Check the integrity of the communication bus wiring harness
- Inspect and clean the contacts in the connectors
- Check the functionality of the modules connected to the bus
- Scan all modules for errors
- Replace damaged components if necessary
Related codes
Error U0046 by Vehicle Brand
FAQ
What does the U0046 code mean?
U0046 is an OBD-II diagnostic trouble code that indicates: Vehicle Communication Bus C
What causes a U0046 error code?
The most common causes of U0046 include: Open or short circuit in the communication bus circuit; Wiring harness damage; Fault in one of the modules connected to the bus; Problems with contacts in connectors.
How do I fix a U0046 diagnostic trouble code?
To fix U0046: Check the integrity of the communication bus wiring harness. Inspect and clean the contacts in the connectors. Check the functionality of the modules connected to the bus. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0046?
Limited driving only, diagnose soon
How much does it cost to fix U0046?
The estimated repair cost for U0046 is $6–56. Actual cost depends on your vehicle, location, and labor rates.
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