OBD-II Code · Cooling
P0480
Cooling Fan 1 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.
Primary cooling 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 in traffic
Likely causes
- Failed fanMost common
- Blown fuse
- Wiring
Read the full diagnostic procedureP0480 sets when the PCM detects a fault in the control circuit for cooling fan relay 1 -- either the relay coil is open, the PCM ground-side driver c…
P0480 sets when the PCM detects a fault in the control circuit for cooling fan relay 1 -- either the relay coil is open, the PCM ground-side driver cannot pull the coil low, the 12V coil feed is missing, or the relay is shorted. On most modern vehicles the PCM grounds the relay coil to energize it, while a constant 12V feed (usually from an ignition-switched fuse) sits on the other coil terminal.
Cheapest first, and this is the cheapest of all the cooling fan codes
- pull relay 1 from the underhood fuse box / TIPM / PDC, inspect the terminals for heat damage or pin push-out, and swap it with a known-identical relay (horn or A/C compressor relay is usually the same Bosch/Hella micro-relay part number).
- Clear codes and retest -- if the code stays gone, you spent $0 and 10 minutes.
- If swapping the relay doesn't clear it, key-on and back-probe the two coil pins at the relay socket: one should have 12V (the feed), the other should sit at 12V at rest and pulse to near 0V when the PCM commands fan on (you can force fan-on with a bidirectional scan tool, or by raising commanded ECT).
- If the 12V feed is missing, trace the fuse and the splice.
- If the feed is present but the PCM-side ground-control pin never pulls low, the PCM driver is failing or the wire to PCM is open.
- Caveat: cooling fan circuits are the single most common false-failure on GM TIPM-style fuse boxes (Chrysler/Dodge) and on integrated GM underhood bussed electrical centers -- techs replace fans and motors for $400+ when the actual fault was a $25 relay or a corroded fuse box socket.
Vehicle-specific patterns2008-2014 Dodge Grand Caravan / Chrysler Town & Country 3.6L Pentastar -- TIPM internal fan relay solder joint cracks, Chrysler TSB 08-001-15, recall…
- 2008-2014Dodge Grand Caravan / Chrysler Town & Country 3.6L Pentastar -- TIPM internal fan relay solder joint cracks, Chrysler TSB 08-001-15, recall later issued for repeat failures.
- 2007-2013GMC Acadia / Buick Enclave / Chevy Traverse 3.6L LY7 -- underhood bussed electrical center (BEC) fan relay socket overheats and discolors the plastic, GM bulletin PIP4946.
- 2006-2011Jeep Grand Cherokee WK 3.7L -- TIPM cooling fan low-speed driver fails internally, full TIPM replacement only.
- 2010-2015Chevy Equinox 2.4L LAF -- fan relay control wire backed out of X50A PCM connector pin 44, GM PIC5784.
Estimated repair$25 to $620.
Look up another code
P0480 — frequently asked
What does a P0480 code mean?
Primary cooling fan circuit fault.
What causes a P0480 code?
Common causes: Failed fan; Blown fuse; Wiring.
What are the symptoms of a P0480 code?
Typical symptoms: Check engine light; Overheating in traffic.
Is it safe to drive with a P0480 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 P0480 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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