U0012
Medium Speed CAN Communication Bus (+) Open
U0012 is an OBD-II diagnostic trouble code meaning: Medium Speed CAN Communication Bus (+) Open. Common causes: wire break in the positive line of the can bus, connector damage or corrosion. Estimated repair cost: $6–33.
Symptoms
- Malfunctions in the operation of various vehicle systems
- Check Engine Light Is On
- Lost connection with some modules
- Unstable operation of the dashboard
Causes
- Wire break in the positive line of the CAN bus
- Connector damage or corrosion
- Problems with modules connected to the CAN bus
- Wiring harness fault
- Power or grounding problems
How to Fix
- Check the integrity of the positive line of the CAN bus
- Inspect connectors and contacts for damage or corrosion
- Check modules connected to the CAN bus
- Check wiring harness for damage
- Check power supply and grounding of modules
Related codes
Error U0012 by Vehicle Brand
FAQ
What does the U0012 code mean?
U0012 is an OBD-II diagnostic trouble code that indicates: Medium Speed CAN Communication Bus (+) Open
What causes a U0012 error code?
The most common causes of U0012 include: Wire break in the positive line of the CAN bus; Connector damage or corrosion; Problems with modules connected to the CAN bus; Wiring harness fault.
How do I fix a U0012 diagnostic trouble code?
To fix U0012: Check the integrity of the positive line of the CAN bus. Inspect connectors and contacts for damage or corrosion. Check modules connected to the CAN bus. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0012?
Yes, but get it checked soon
How much does it cost to fix U0012?
The estimated repair cost for U0012 is $6–33. Actual cost depends on your vehicle, location, and labor rates.
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