OBD-II Code · Cooling
P0481
Cooling Fan 2 Control Circuit
Severity
high
Left alone, this one tends to take other parts with it.
Can you drive it
Not for long
Driving on this one risks further damage. Get it to a shop rather than carrying on with it.
Indicative cost (USD)
$150–$600
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
Secondary fan circuit fault.
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
- Overheating under load
Likely causes
- Failed fanMost common
- Wiring
Read the full diagnostic procedureP0481 sets on the cooling fan relay 2 control circuit -- on dual-fan systems this is typically the high-speed relay or the second fan motor's relay (…
P0481 sets on the cooling fan relay 2 control circuit -- on dual-fan systems this is typically the high-speed relay or the second fan motor's relay (depending on platform, some use one fan with low/high relays, others use two separate fans). Diagnostic approach is identical to P0480 but applies to the second relay in the circuit.
Cheapest first
- pull relay 2 from the underhood power distribution center and swap with an identical-part-number relay (verify by reading the relay label, not by socket position).
- Many platforms intentionally use the same micro-relay for fan low, fan high, A/C compressor clutch, horn, and fuel pump precisely so you can swap and isolate in 60 seconds.
- Clear codes, command fan high via scan tool, and observe.
- If swapping doesn't fix it, back-probe the coil pins: 12V feed should be present whenever the ignition is on, ground-control side should pulse to near 0V when commanded high-speed fan.
- If the relay clicks but the fan doesn't spin on high, the fault is downstream in the fan motor or the high-side power wire, not in the control circuit -- P0481 is specifically the control circuit code, so motor failures throw separate codes.
- Caveat: dual-relay fan systems often have a sequencing logic where relay 2 only energizes above a specific ECT (220F+) or with A/C high-pressure refrigerant demand -- if you can't get the system to command relay 2 on, you can't test it, and the code will keep returning because the underlying fault is intermittent.
Vehicle-specific patterns2007-2010 Chrysler Sebring / Dodge Avenger 2.4L -- TIPM high-speed fan relay solder fatigue, very common, Chrysler TSB 08-001-15 and downstream class…
- 2007-2010Chrysler Sebring / Dodge Avenger 2.4L -- TIPM high-speed fan relay solder fatigue, very common, Chrysler TSB 08-001-15 and downstream class action settlement covers TIPM replacement on some VINs.
- 2008-2013Cadillac CTS 3.6L LLT -- bussed electrical center fan high relay socket carbonizes from sustained track-day use, requires connector pin replacement plus relay.
- 2006-2012Mercedes-Benz C-Class W204 M272 -- SAM (Signal Acquisition Module) fan output stage fails, SAM replacement required.
- 2009-2014Ford Flex 3.5L Duratec -- fan controller module (not a discrete relay -- a solid-state PWM module behind the left headlight) fails internally and trips P0481, common at 70-100k miles.
Estimated repair$25 to $720.
Look up another code
P0481 — frequently asked
What does a P0481 code mean?
Secondary fan circuit fault.
What causes a P0481 code?
Common causes: Failed fan; Wiring.
What are the symptoms of a P0481 code?
Typical symptoms: Check engine light; Overheating under load.
Is it safe to drive with a P0481 code?
Not for long. Driving on this one risks further damage. Get it to a shop rather than carrying on with it. Estimated repair: $150-$600.
How do I diagnose a P0481 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.
More free tools