P0503
12V Current Short Circuit
12V / Low-voltage · Powertrain
medium
What does this code mean?
A short circuit has been detected in the relevant circuit.
This is a generic OBD-II / UDS code — the meaning is standardized across manufacturers.
Possible symptoms
Blown fuse
Warning light
System shutting down
Possible causes
- 1.Pinched wire
- 2.Insulation damage
- 3.Water ingress
- 4.Failed component
These are possible causes — a professional inspection is required to confirm.
Diagnostic procedure & recommended checks
- Find the short with a multimeter
- Inspect the harness for damage
- Check for moisture
Recommended actions
- Repair the short
- Replace the damaged harness
Can I drive?
Yes, after charging the 12V battery
When to contact a professional
If a new 12V battery does not fix it, have the charging and DC-DC system inspected.
Related Fix & Solve guides
Diagnostic information is provided for informational purposes and does not replace professional inspection. High-voltage systems must only be serviced by qualified personnel.