Code P0481 Check engine light came on, code P0481. I changed both radiator fan relays and cleared the codes but it came back within the hour. Car is not overheating but since it's winter in the northeast that's no indication that the fans are working correctly. If I turn on the A/C, both fans come on.... What should I check next??

Question edited for clarity.
Question moved to model category

Well the first thing that leapt of the page was that you said you had two batteries and you undid the clamps to both, but then I realised to meant you undid both clamps to one battery. That is actually the worst thing to do because now you have to reset the security system and engine immobilizer.

Make sure your battery clamps and posts are cleaned with a wire brush, wipe with Vaseline or Dielectric Grease and then make sure the clamps are tight. Then put the battery on to charge. This says you have low voltage.

DTC P0480 registers when the PCM doesn't receive the proper amount of voltage from the cooling fan control circuit that should indicate that the fan works properly. This code can be caused by a faulty cooling fan relay, a bad cooling fan, damaged wiring, or a bad coolant temperature sensor.
Jan 19, 2024

P0480 Code: Fan 1 Control Circuit - CarParts.com

I have a 2005 Chevy Equinox and the check engine light is ...

JustAnswer https://www.justanswer.com > Chevrolet Repair
May 6, 2010 - P0480 is for the low speed cooling fan relay control circuit. · A short to ground · DTC P0480 Cooling Fan Relay 1 Control Circuit · The ignition is ...

1 answer · Top answer: DTC P0480 or P0481 Circuit Description • P0480 is for the low speed cooling fan relay ...

v..it Everything is fine but check engine code p0480 comes

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Dec 2, 2011 - 2006 chevy: v..it Everything is fine but check engine code p0480 comes... · FC relay connector is damaged (check pins for damage, and for moisture) ...

1 answer · Top answer: Here is a picture of relay you need to replace so start with that..If code comes back on ...

P0480 OBD-II Trouble Code: Cooling Fan 1 Control Circuit ...

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P0480 is a general OBD2 trouble code that refers to the a malfunction within the cooling fan control circuit. This code is similar to P0481 and P0482 codes.

PLEASE HELP!!!!! ' Page 2 ' GMC Terrain, Equinox, and SRX ...

terrainforum.net https://www.terrainforum.net > threads > page-2
Sep 8, 2020 - Haynes manual says test fan motors check fuse check relay check all wiring and connectors to fans and if that don't work take it in.

But you may need an auto electrician

https://www.google.com/search?q=auto+electrician+near+me

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check wiring connection and harness ------https://www.yourmechanic.com/article/p0481-obd-ii-trouble-code-cooling-fan-2-control-circuit-malfunction-by-ian-swan

It sounds like you have a control problem , The ECM or PCM energize the relay by supplying a ground or power depending on the manufacturer ! What make , year model vehicle ! P0481 Cooling Fan 2 Control Circuit Malfunction

THis should help
P0481 Cooling Fan 2 Control Circuit Malfunction

Many of these forums are a good resource:
P0481 GM Forum Buick Cadillac Chev Olds GMC Pontiac chat


If you have changed the relays, it could be a fan or wiring problem.

code P0481 high speed number 2 fan relay control circuit. check for faulty fan 2 relay blowed fuse. code P0340 no camshaft position sensor circuit failure.possible causes camshaft sensor has failed or crankshaft sensor failed both sensor work together to control fuel timing and ignition timing.PCM has failed many things will cause that code.check sensor wiring connector for shorts or damaged.

code p 0481 refers to coolant temp fans --circuit malfunction===causes-- wiring--- , fan--ECM
fix the fan not working --fuses wiring fan motor
codes p 0132 and 137 and p 0141 refer to the heated oxygen sensors in the exhaust manifolds , both banks before the cat converters
replace those sensors and it will fix those codes

Radiator cooling fan 2, control system malfunction. Check fuses under hood & in fuse panel under dash. If all are good check for power & ground to radiator fan motors. Verify motors work by powering up with jumper wires. If they work may have bad relay. If they dont work will need to replace motor.

That fault indicates a problem in the electronic cooling fan circuit. More specificly the output driver in the onboard computer has detected a problem with the control circuit of the electronic fans. First inspect for correct operation of both radiator mounted fans.

Not familiar with the code but I would say, take it to a trusted mechanic who can identify the code, this will tell you which sensor is sending the code. It may be the 02 sensor and can be reset when the mechanic checks and resets your codes.

Looked it up in Chilton's, confirmed in http://www.obd-codes.com/trouble_codes/

P0481 Cooling Fan 2 Control Circuit Malfunction

Each fan will throw a different code. See 3 fans listed for your model. Here's a link for the wiring schematic: http://www.chiltonlibrary.com/content/images/WD/GM/014/WD_GM_014788.pdf


Best of luck.
Greg