OBD-II Code · Powertrain
P0482
Cooling Fan Relay 3 Control Circuit
Severity
medium
Worth booking. It costs fuel, emissions or comfort until it is fixed.
Can you drive it
Only if running normally
A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety.
Indicative cost (USD)
$80–$400
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
Fault in cooling fan relay 3 control circuit.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then work the likely-causes list in the order shown.
That order is what a shop checks first for this code — wiring and connections before the component they run to, because a connector costs nothing to inspect and is a common answer.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Check engine light
- Fan staying on or off
- Possible overheating
Likely causes
- Failed fan relayMost common
- Wiring
- Failed PCM driver
Read the full diagnostic procedureP0482 sets on cooling fan relay 3 control circuit -- only present on vehicles with three-stage fan control (low/medium/high) or on dual-fan setups wh…
P0482 sets on cooling fan relay 3 control circuit -- only present on vehicles with three-stage fan control (low/medium/high) or on dual-fan setups where a third relay handles series/parallel switching for variable fan speed. These three-relay systems are most common on European platforms, Chrysler/Jeep TIPM-equipped vehicles, and some GM trucks with heavy-duty cooling packages.
Cheapest first, same as P0480/P0481
- identify relay 3 in the under-hood fuse box (the diagram on the lid labels them, or the FSM wiring section will), pull it, inspect for melted terminals or burnt smell, and swap with an identical-part-number relay.
- The micro-relay used for fan stages is almost always cross-compatible with the horn relay and the A/C clutch relay on the same vehicle -- you can isolate which side of the circuit is faulty in 5 minutes with no parts purchase.
- If swap doesn't clear, back-probe the relay socket coil pins for 12V feed and PCM-side switching.
- Caveat: three-stage fan systems usually employ a dropping resistor pack (or a series/parallel coil configuration on some Chrysler/Mercedes platforms) and that resistor pack burns out before the relays do -- a code that points at relay 3 sometimes points at the upstream resistor pack that feeds relay 3's load circuit, so verify the resistor pack is intact before condemning the relay or the PCM driver.
Vehicle-specific patterns2005-2010 Chrysler 300 / Dodge Charger 5.7L Hemi -- TIPM internal fan relay 3 driver fails along with the entire fan control section, Chrysler TSB 08…
- 2005-2010Chrysler 300 / Dodge Charger 5.7L Hemi -- TIPM internal fan relay 3 driver fails along with the entire fan control section, Chrysler TSB 08-001-15 covers TIPM replacement.
- 2006-2011Mercedes-Benz E-Class W211 M272 -- fan resistor pack (series resistor on the fan motor) burns open, sets P0482 even though the relay itself is fine.
- 2007-2013Jeep Wrangler JK 3.8L -- TIPM cooling fan stage 3 control fails, mopar reman TIPM is the only listed fix.
- 2008-2014BMW 3-Series E90 N52 -- electric fan module (integrated controller and motor) internal MOSFET fails, sets P0482 on stage 3 command, full fan-and-controller assembly replacement.
Estimated repair$25 to $850.
Look up another code
P0482 — frequently asked
What does a P0482 code mean?
Fault in cooling fan relay 3 control circuit.
What causes a P0482 code?
Common causes: Failed fan relay; Wiring; Failed PCM driver.
What are the symptoms of a P0482 code?
Typical symptoms: Check engine light; Fan staying on or off; Possible overheating.
Is it safe to drive with a P0482 code?
Only if running normally. A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety. Estimated repair: $80-$400.
How do I diagnose a P0482 code?
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed. 1. Note every code that is set, not just this one. 2. Read the freeze frame — the conditions the fault was recorded under. 3. Confirm the fault is current rather than history. 4. Then work the likely-causes list in the order shown.
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