U0035
Vehicle Communication Bus A (-) High
U0035 is an OBD-II diagnostic trouble code meaning: Vehicle Communication Bus A (-) High. Common causes: open or short circuit in the can-a high line, poor contact in can bus connectors. Estimated repair cost: $6–56.
Symptoms
- Check Engine light comes on
- Incorrect operation of electronic systems
- Lost connection with some modules
- Problems with diagnostics via OBD-II
Causes
- Open or short circuit in the CAN-A High line
- Poor contact in CAN bus connectors
- Malfunction of one of the electronic modules
- Wiring harness damage
- Contact corrosion
How to Fix
- Check the integrity of the CAN bus wires
- Inspect connectors for oxidation or damage
- Check the resistance of the CAN bus (should be about 60 ohms)
- Disable the modules one by one to find the faulty one.
- If necessary, replace damaged wires or connectors
Related codes
Error U0035 by Vehicle Brand
FAQ
What does the U0035 code mean?
U0035 is an OBD-II diagnostic trouble code that indicates: Vehicle Communication Bus A (-) High
What causes a U0035 error code?
The most common causes of U0035 include: Open or short circuit in the CAN-A High line; Poor contact in CAN bus connectors; Malfunction of one of the electronic modules; Wiring harness damage.
How do I fix a U0035 diagnostic trouble code?
To fix U0035: Check the integrity of the CAN bus wires. Inspect connectors for oxidation or damage. Check the resistance of the CAN bus (should be about 60 ohms). For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0035?
Yes, but get it checked soon
How much does it cost to fix U0035?
The estimated repair cost for U0035 is $6–56. Actual cost depends on your vehicle, location, and labor rates.
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