U0043
Vehicle Communication Bus B (-) Low
U0043 is an OBD-II diagnostic trouble code meaning: Vehicle Communication Bus B (-) Low. Common causes: broken or damaged communication bus wires, short circuit in the communication bus circuit. Estimated repair cost: $17–56.
Symptoms
- Check Engine light comes on
- Malfunction of vehicle electronic systems
- Problems with diagnostics via OBD-II
- Unstable operation of the dashboard
Causes
- Broken or damaged communication bus wires
- Short circuit in the communication bus circuit
- Malfunction of one of the electronic modules
- Poor contact in communication bus connectors
- Problems with power supply of electronic modules
How to Fix
- Check the integrity of the communication bus wires
- Check connections and connectors of the communication bus
- Diagnose electronic modules for faults
- Check power supply of electronic modules
- Repair only from an authorized dealer
Related codes
Error U0043 by Vehicle Brand
FAQ
What does the U0043 code mean?
U0043 is an OBD-II diagnostic trouble code that indicates: Vehicle Communication Bus B (-) Low
What causes a U0043 error code?
The most common causes of U0043 include: Broken or damaged communication bus wires; Short circuit in the communication bus circuit; Malfunction of one of the electronic modules; Poor contact in communication bus connectors.
How do I fix a U0043 diagnostic trouble code?
To fix U0043: Check the integrity of the communication bus wires. Check connections and connectors of the communication bus. Diagnose electronic modules for faults. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0043?
Yes, but get it checked soon
How much does it cost to fix U0043?
The estimated repair cost for U0043 is $17–56. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat