U0028
Vehicle Communication Bus A
U0028 is an OBD-II diagnostic trouble code meaning: Vehicle Communication Bus A. Common causes: broken or damaged can bus wires, short circuit in can circuit. Estimated repair cost: $6–56.
Symptoms
- Check Engine light comes on
- Incorrect operation of various vehicle systems
- Lost connection with some modules
- Dashboard malfunctions
- Problems with diagnostics via OBD-II
Causes
- Broken or damaged CAN bus wires
- Short circuit in CAN circuit
- Fault in one of the connected modules
- Poor contact in bus connectors
- Problems with module power supply
How to Fix
- Check the integrity of the CAN bus wiring
- Inspect connectors and contacts for oxidation
- Check power supply of all connected modules
- Diagnose each connected module separately
- If necessary, replace damaged wiring sections
Related codes
Error U0028 by Vehicle Brand
FAQ
What does the U0028 code mean?
U0028 is an OBD-II diagnostic trouble code that indicates: Vehicle Communication Bus A
What causes a U0028 error code?
The most common causes of U0028 include: Broken or damaged CAN bus wires; Short circuit in CAN circuit; Fault in one of the connected modules; Poor contact in bus connectors.
How do I fix a U0028 diagnostic trouble code?
To fix U0028: Check the integrity of the CAN bus wiring. Inspect connectors and contacts for oxidation. Check power supply of all connected modules. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0028?
Yes, but get it checked soon
How much does it cost to fix U0028?
The estimated repair cost for U0028 is $6–56. Actual cost depends on your vehicle, location, and labor rates.
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