WHAT CAUSES A P0481 FAN#2 - 2000 Cadillac DeVille

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

Follow the links below. P0480 OBD II Trouble Code Cooling Fan 1 Control Circuit Malfunction...


P0481 Cooling Fan Relay 2 Control Circuit var ezzns2 1 10 504707 1 60...

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 p0481 refers to the engine coolant blower motor 2-circuit malfunction=== causes--- wiring--engine coolant blower motor---ecm check fans are not seized and there is current getting to them

Hi there:
DTC P0481 - Cooling Fan 2 Ctrl CKT Malfunction
The P0481 requires reprogramming the PCM at a Mazda dealership, see below TSB in THIS LINK:



DESCRIPTION
Some vehicles may exhibit DTC P0481 (Cooling fan relays malfunction) stored in the PCM.

The false DTC detection occurs when the A/C refrigerant pressure switch is ON but the cooling fan relay is turned OFF by the PCM because the coolant temperature is 108C degrees and under. The PCM stores DTC P0481 because the cooling fan is operating without PCM control command. This is due to improper PCM calibration.


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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

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

should be the one on drivers side will have a light blue and black wire \s going too it