P0484Fan Circuit Current High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P0484 monitors the current drawn in the fan's load circuit: if it exceeds a threshold – blocked or stiff motor, shorted turns, a short in the load circuit – the code sets. This is only possible where the fan runs on a current-measuring semiconductor driver or fan module; plain relay circuits do not measure load current. Supplier patents (Bosch and others) describe current limiting or switch-off after a few seconds of overcurrent, ignoring the inrush current. No manufacturer table available to us lists P0484, so thresholds and warning-lamp behaviour remain open; CARB requires output components to be monitored.
- What you may notice
- Warning lamp (depending on the maker)
- Fan does not run, runs only briefly or at reduced power
- Humming or grinding at the fan, possibly blown fan fuse
- Overheating at standstill
- Likely causes
- LikelyFan motor stiff (bearing damage) or blocked (foreign object, ice, bent blade)
- PossibleShorted turns or worn brushes in the fan motor
- PossibleShort in the load circuit (pinched or chafed wire)
- RareFan control module faulty (wrong current measurement)
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €120 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.