U0036
Vehicle Communication Bus A (-) shorted to Bus A (+)
U0036 is an OBD-II diagnostic trouble code meaning: Vehicle Communication Bus A (-) shorted to Bus A (+). Common causes: damage to the can bus wiring harness, short circuit in one of the ecus. Estimated repair cost: $6–56.
Symptoms
- Various vehicle systems do not work or work incorrectly
- Check Engine light comes on
- Problems starting the engine
- Lost connection with diagnostic equipment
Causes
- Damage to the CAN bus wiring harness
- Short circuit in one of the ECUs
- Corrosion or oxidation of contacts
- Mechanical damage to wiring
How to Fix
- Visual inspection of the CAN bus wiring harness for damage
- Checking the resistance between lines CAN-A+ and CAN-A-
- Turning off the ECU one by one to find the faulty module
- Repair or replacement of damaged wires
- Cleaning contacts from corrosion
Related codes
Error U0036 by Vehicle Brand
FAQ
What does the U0036 code mean?
U0036 is an OBD-II diagnostic trouble code that indicates: Vehicle Communication Bus A (-) shorted to Bus A (+)
What causes a U0036 error code?
The most common causes of U0036 include: Damage to the CAN bus wiring harness; Short circuit in one of the ECUs; Corrosion or oxidation of contacts; Mechanical damage to wiring.
How do I fix a U0036 diagnostic trouble code?
To fix U0036: Visual inspection of the CAN bus wiring harness for damage. Checking the resistance between lines CAN-A+ and CAN-A-. Turning off the ECU one by one to find the faulty module. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0036?
Do not drive — repair immediately
How much does it cost to fix U0036?
The estimated repair cost for U0036 is $6–56. Actual cost depends on your vehicle, location, and labor rates.
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