U0009
High Speed CAN Communication Bus (-) shorted to Bus (+)
U0009 is an OBD-II diagnostic trouble code meaning: High Speed CAN Communication Bus (-) shorted to Bus (+). Common causes: damage to the can bus wiring harness, short circuit in one of the connected modules. Estimated repair cost: $6–56.
Symptoms
- Unstable engine operation
- Failure of individual vehicle systems
- The Check Engine light comes on
- Problems with data transfer between modules
Causes
- Damage to the CAN bus wiring harness
- Short circuit in one of the connected modules
- Mechanical damage to wiring
- Corrosion of contacts in connectors
How to Fix
- Visual inspection of the CAN bus wiring harness
- Checking wiring integrity with a multimeter
- Disabling modules one by one to find the faulty one
- Repair or replacement of damaged wires
Related codes
Error U0009 by Vehicle Brand
FAQ
What does the U0009 code mean?
U0009 is an OBD-II diagnostic trouble code that indicates: High Speed CAN Communication Bus (-) shorted to Bus (+)
What causes a U0009 error code?
The most common causes of U0009 include: Damage to the CAN bus wiring harness; Short circuit in one of the connected modules; Mechanical damage to wiring; Corrosion of contacts in connectors.
How do I fix a U0009 diagnostic trouble code?
To fix U0009: Visual inspection of the CAN bus wiring harness. Checking wiring integrity with a multimeter. Disabling modules one by one to find the faulty one. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0009?
Do not drive — repair immediately
How much does it cost to fix U0009?
The estimated repair cost for U0009 is $6–56. Actual cost depends on your vehicle, location, and labor rates.
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