Question about 2003 Chevrolet TrailBlazer

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Service engine soon light - Diagnostic codes P1481, P1482

I need to know the definitions of OBD II codes P1481, P1482 for 2003 Trailblazer. I just replaced the fan clutch, and am now getting these codes.

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  • Kokoko22 May 02, 2009

    Code 1481..... Engine soon light on, RPH high, fan clutch, water pump and fuel filter recently installed. Wasting too much fuel.......



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Read this. Fan.

Posted on Dec 18, 2008


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Code p1484

Help with a P1484 [Archive] - Chevy TrailBlazer, TrailBlazer SS ... > ... > 02-09 Vortec 4.2L I-6 Engine and Drivetrain

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Took the truck to Autozone and had the code read. The truck code came back as aP1484. Something dealing with the fan. Any help greatly ... Bad fan clutch?
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More results from

19179140 P1481 p1484 fault codes? - No-IP

Dec 28, 2015 | Cars & Trucks

1 Answer


P1481 definition is coolant fan speed,The wire on this sensor tends to chaff through the plastic it is routed through,this is very common, the fix is to replace thhe harness remove the harness from the plastic guide,and repair for opens, or chaff,

Dec 09, 2012 | Cars & Trucks

1 Answer

2003 chevrolet trailblazer 4.2 problem code p1481

See attached picture for location of temp. sensor, but that code has nothing to do with temp sensor. The speed of the fan does not agree with the commanded speed, you may have another bad fan clutch.


Oct 04, 2012 | 2002 Chevrolet TrailBlazer

1 Answer

2002 trailblazer 4wheel - scan code p1484/p1481. Spent days researching these 2 codes on many web sites and forums> cooling fan speed signal lost only sometimes mostly in city not freeway. The car is...

Sounds like the fan clutch is going bad, these had a reputation for failing. The fan clutch is controlled by the computer and if the fan speed does not match what the computer has set, an error code is set. A fan clutch costs in the area of $120 - $200, and the labor to replace it is probably another equal amount.

Jul 07, 2011 | 2004 Chevrolet TrailBlazer

1 Answer

Service engine light came on and we put in on a computer and it gave the code p1481 what does this mean

This is almost always the fan clutch. Years 2002-2004 are prone to fan clutch failure. Also a good idea to check out the harness for any frayed wiring.

Feb 06, 2011 | 2003 Chevrolet Trailblazer Ext

1 Answer

2003 Trailblazer L6 running very sluggish. The only code the ECU is throwing is a P1481 code which upon some quick searches is the fan clutch. That shouldnt have anything to do with the poor performance...

Code P1481 - Cooling Fan Speed Sensor Circuit

Several owners repair this sensor and connections, but the problem come on again; I suggest replace the sensor; this is built into the fan clutch.

Hope helps.

Jul 09, 2010 | 2003 Chevrolet TrailBlazer

1 Answer

I replace the fan clutch and i still have the code p1481 what does that mean? 2002 chevrolet Trailblazer 4.2 Thanks You! Arthur Tyler

TSB#05-06-02-012B: Service Engine Soon (SES) or Check Engine Light On, DTC P0480, P0526/P1481/P1484 Set (Replace Engine Cooling Fan Wiring Harness) - (Oct 19, 2006)
Service Engine Soon (SES) or Check Engine Light On,
DTC P0480/P0526/P1481/P1484 Set (Replace Engine Cooling Fan Wiring Harness)
Some customers may comment that the Service Engine Soon (SES) or Check Engine light is illuminated. This condition may be intermittent and upon investigation, the technician may find either DTC P0480, P0526, P1481 or P1484 set.

This condition may be caused by the cooling fan harness chaffing against the plastic guide it routes through. This
contact may damage the insulation of the wires enclosed in that harness.

Replace the engine cooling fan harness using the procedure listed below.

1. Remove the cooling fan. Refer to the Cooling Fan and Shroud Replacement procedure in the Engine Cooling sub-section of SI.

2. Place the cooling fan assembly on a bench.
Disconnect the harness electrical connector from the cooling fan clutch.

3. Remove the harness from the plastic guide while feeding the wires out of the slot.

4. Before installing the new harness, wrap the affected area on the wires with electrical tape to keep the protective sleeve in place. Be sure to keep the tape approximately 25 mm (1 in) away from the connector so the wires can be fed into the slot.

5. Feed the wires into the slot and install the harness to the plastic guide.

6. Connect the harness electrical connector to the cooling fan clutch.

7. Install the cooling fan. Refer to the Cooling Fan and Shroud Replacement procedure in the Engine Cooling sub-section of SI.

Part Number 89024920

Harness Assembly, Engine Cooling Fan Wiring
Thank you for using fixya.

Apr 29, 2010 | 2003 Chevrolet TrailBlazer

2 Answers

Code 1481 and1271

your code P1481 is for the cooling fan speed the problem is often the wires and connector that go to that unit ... removing and replugging the connector sometimes fixes it ... also check the fan clutch and fan (not as often the trouble) .. there is a techniical bulliten out for this trouble .. (tsb050605012) .. sometimes the wire harness is replaced for the fan ...

your trouble code p1271 is associated with the accelerator pedal position sensor (APP) (right above the gas pedal) .. again check the wiring and connector going to the APP .. if the APP turns out to be bad then its not hard to change and requires no computer changes ... when you get an APP alarm then your car may go into a "reduced speed mode" ...
here is a list of the service bullitins on your trailblazer....

Apr 15, 2010 | 2002 Chevrolet TrailBlazer

1 Answer

Where is the cooling fan speed sensor on my 2002 trailblazer?

The cooling fan speed sensor is built in inside the fan clutch.
If you have a code p1481 or similar , pointing at the cooling fan speed sensor, often you have to fix or replace the wiring , rather that the sensor.
Check that wiring has continuity, the wire to sensor must have +5V. Here an interesting website on trailblazer fan system.

Oct 03, 2009 | Chevrolet TrailBlazer Cars & Trucks

1 Answer

2003 chevy trailblazer....idlind at 600-750 rpms, when i engage the a/c it drops to 500rpms then stalls. also have two codes, p1481 and p1482. whats wrong?

The coolant fan clutch or the electric connections to the fan clutch is code1482.

Code 1481 is associated with the coolant fan problem but concerns the PCM having an error.

This error is why your car is stalling. The fan clutch is variable. When it is fully engaged the fan has more resistance and pulls down the rpm. The PCM is suppose to respond to this and raise the rpm for a steady idle. It is not doing it and needs a software upgrade.

The Chevy dealer may have a service note on this problem. The upgrade may be free.

Aug 24, 2009 | 2003 Chevrolet TrailBlazer

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