U0018
Medium Speed CAN Communication Bus (-) shorted to Bus (+)
U0018 is an OBD-II diagnostic trouble code meaning: Medium Speed CAN Communication Bus (-) shorted to Bus (+). Common causes: damage to can bus wiring, corrosion of connectors. Estimated repair cost: $17–111.
Symptoms
- Unstable engine operation
- Failure of safety systems (ABS, ESP)
- The Check Engine light comes on
- Lost connection with diagnostic equipment
- Incorrect operation of the dashboard
Causes
- Damage to CAN bus wiring
- Corrosion of connectors
- Malfunction of one of the CAN network modules
- Mechanical damage to the wiring harness
- Moisture getting into connectors
How to Fix
- Visual inspection of CAN bus wiring and connectors
- Checking wiring integrity using a multimeter
- Disabling CAN network modules one by one to identify the faulty one
- Replacing damaged wires or connectors
- Repair or replacement of a faulty module
Related codes
Error U0018 by Vehicle Brand
FAQ
What does the U0018 code mean?
U0018 is an OBD-II diagnostic trouble code that indicates: Medium Speed CAN Communication Bus (-) shorted to Bus (+)
What causes a U0018 error code?
The most common causes of U0018 include: Damage to CAN bus wiring; Corrosion of connectors; Malfunction of one of the CAN network modules; Mechanical damage to the wiring harness.
How do I fix a U0018 diagnostic trouble code?
To fix U0018: Visual inspection of CAN bus wiring and connectors. Checking wiring integrity using a multimeter. Disabling CAN network modules one by one to identify the faulty one. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0018?
Do not drive — repair immediately
How much does it cost to fix U0018?
The estimated repair cost for U0018 is $17–111. Actual cost depends on your vehicle, location, and labor rates.
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