Cooling Fan Circuit Over Current
The P0484 code indicates that the powertrain control module (PCM) has detected an excessive current draw in the cooling fan circuit. This typically occurs when the fan motor is drawing more amperage than specified, often due to a failing motor, seized bearings, or a short circuit. The PCM monitors the current flow and sets this code when it exceeds a calibrated threshold, which can lead to overheating if not addressed.
01. Most Common Causes
- Faulty cooling fan motor drawing excessive current
- Short circuit in the fan wiring or connector
- Seized fan motor bearings causing high resistance
- Failed fan relay or control module
02. Symptoms You Will Notice
- Engine overheating, especially at idle or low speeds
- Check Engine Light illuminated
- Cooling fan running continuously or not at all
- Blown fuse for the cooling fan circuit
03. Step-by-Step Diagnosis
Step 1: Visually inspect the cooling fan, wiring, and connector for damage, corrosion, or debris.
Step 2: Use a multimeter to measure current draw of the fan motor; compare to manufacturer specs.
Step 3: Check for short circuits by testing resistance between fan power and ground.
Step 4: Test the fan relay and control circuit for proper operation.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The cooling fan may not operate correctly, leading to engine overheating and potential damage. Have it diagnosed and repaired promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on whether the fan motor, relay, or wiring needs replacement.