U0003
High Speed CAN Communication Bus (+) Open
Severity: HIGH
Symptoms
- Check Engine light comes on
- Incorrect operation of various vehicle systems
- Lost connection with some modules
- Problems starting the engine
- Dashboard malfunctions
Causes
- Broken wire in the CAN bus (+)
- Corrosion of contacts in connectors
- Wiring harness damage
- Fault in one of the modules connected to the bus
- Problems with CAN bus power supply
How to Fix
- Check the integrity of the CAN bus wires (+)
- Inspect connectors for corrosion or damage
- Check resistance and continuity
- Diagnose the operation of modules connected to the bus
- If necessary, replace damaged wires or connectors