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Northwest Chapter
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Did you mess with the fan clutch? Thats the code for the PCM not seeing a signal from the fan clutch, if you've swapped it for efans then it should be on or your wiring harness is messed up.
 

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2002 chevy trailblazer_lt
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4 Posts
Trailblazer Fan Clutch and P1481/P1482

Did a lot of reading on this forum and spent several hours trying to solve my 2002 TB fan clutch issues and thought I'd share my experience.

First, I started out getting the high fan speed code, sorry don't recall the code number off the top of my head, but based on what I read I ordered a replacement fan clutch from ebay. Installed the new clutch fan and the high fan speed code was gone, but then I had P1481, no fan speed detection. Pulled the unit back off and checked all the wires and connectors, put it back on, same thing. Finally I took it off again and compared the wiring harness with the original one by tracing the wires from the connector on one end to the other. To my surprise, and much excitement I might add, found two of the wires on the after market unit were swapped at one of the connectors. Anyway, corrected that and put it back on, then I was getting P1482, *@&%!. Ended up pulling if off again, very frustrated at this point, didn't really see anything, so I unscrewed the sensor from the clutch assembly itself and swapped the original one for the replacement one and put it back on, still had P1482.

At this point I finally decided to look for other things and found the fuse was blown (No. 20 in the fuse box on the driver's fender well). Apparently, the instant I turned the vehicle on with the replacement unit, the one that had the wires swapped, it shorted the circuit and blew the fuse. So, all the other work I did was for nothing, it was the blown fuse due to the swapped wires. So, if you have a similar problem be sure to trace out the wires on your new unit and if you've already installed it, check the fuse! What an ordeal, but no light now and the fan works great!
 

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So I have a 02 trailblazer LT with the 4.2l i6 motor I have just scan my truck to find a p1482 code I have checked the fuse it's fan clutch recently replaced with another 02 fan clutch so wiring harness and all should be exactly the same the harness is in great condition wires intact no vision damage of chafing or dry rotting the relay is the only thing I haven't checked but my fan is not roaring so that from what I read is a sign that the control and speed are fine the fan follows the rpm as it should I do not have the tools or scanners to search down my cause for it all of this is vision physical and sound based the only thing I can think is causing this problem is the connectors between the fuse fan and radiation again dont think that's the cause do to the fact my fan is functioning as it should I'm thinking that this is probably a soft code that my obd2 scanner can pick up cause of have to codes for the catalyst both are exactly the same codes talking to a certified and retired mechanic he said one is a soft code and ones a hard code more then likely if there is something I have missed checking in the process please mention (anything regarding the catalyst my truck is straight pipe it has no catalytic converter or leak just encase someone mention the catalyst as my problem) so I just want to cover all my bases regarding the 1482 code I have never seen this code until today but my fan is not showing any functionality problems as of yet if no one can think of anything I will clear the codes and drive it to see if it was just a soft code or not
 

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Please , could you use punctuation ?
I got a couple lines in and quit . :(
It irks me too.... I bet there's a really good question somewhere inside that alphabet soup... and I'd like to help... but it's tedious to copy/paste the one-big-paragraph into legible and cohesive thoughts.

I give up on reading any questions without AT LEAST one period or capitolization .....somewhere....

Many times I break each sentence into a new paragraph to make my writing easier to comprehend.

I even use my trademark Triple Dots as commas ... just to break continuity.
 
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