What does it mean?
P1482 is a Powertrain (engine, transmission, fuel system) fault code. It indicates: Cooling Fan Control Circuit Improper Voltage .
Symptoms
- MIL on
- Fan runs at the wrong speed, or cuts in and out erratically
- Coolant temperature swings more than it should
- A/C cooling varies with road speed and engine load
- Fan noise changes suddenly while driving
Likely causes
- High resistance from corroded terminals and connectors in the fan control circuit
- Fan control wire partially shorted to another circuit and picking up stray voltage
- Failing fan relay or solid state fan control module with an unstable output
- Poor ground causing a voltage offset on the control line
- Fan motor with worn brushes producing erratic current draw
- Damaged harness with broken strands inside intact insulation
- Charging system voltage out of range, which distorts the whole circuit
How to fix it
- Check charging system voltage first and confirm it is within the normal range
- Measure the actual voltage on the fan control circuit while commanding the fan on and off
- Perform voltage drop tests on both the feed and ground sides of the fan circuit
- Inspect and clean every connector in the fan circuit, including body ground points
- Test the fan module or relay output with the fan connected and then disconnected
- Measure fan motor current draw and compare it with specification
- Replace the failed relay, fan module or motor once the wiring is proven sound