U0027
Low Speed CAN Communication Bus (-) shorted to Bus (+)
U0027 is an OBD-II diagnostic trouble code meaning: Low Speed CAN Communication Bus (-) shorted to Bus (+). Common causes: damage to the can bus wiring harness, short circuit in one of the modules. Estimated repair cost: $6–56.
Symptoms
- Unstable operation of the vehicle's electronic systems
- Malfunction indicator light comes on
- Lost connection with some modules
- Inability to diagnose via OBD-II connector
Causes
- Damage to the CAN bus wiring harness
- Short circuit in one of the modules
- Corrosion of contacts in connectors
- Mechanical damage to wiring
- Incorrect connection of additional equipment
How to Fix
- Visual inspection of the CAN bus wiring harness
- Checking the integrity of wires using a multimeter
- Disabling modules one by one to identify the faulty one
- Replacing damaged wires or connectors
- Checking that additional equipment is connected correctly
Related codes
Error U0027 by Vehicle Brand
FAQ
What does the U0027 code mean?
U0027 is an OBD-II diagnostic trouble code that indicates: Low Speed CAN Communication Bus (-) shorted to Bus (+)
What causes a U0027 error code?
The most common causes of U0027 include: Damage to the CAN bus wiring harness; Short circuit in one of the modules; Corrosion of contacts in connectors; Mechanical damage to wiring.
How do I fix a U0027 diagnostic trouble code?
To fix U0027: Visual inspection of the CAN bus wiring harness. Checking the integrity of wires using a multimeter. Disabling modules one by one to identify the faulty one. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0027?
Limited driving only, diagnose soon
How much does it cost to fix U0027?
The estimated repair cost for U0027 is $6–56. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat