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How do i turn off 4wd service light - 2001 Chevrolet Blazer

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It's one of two things


The Service 4wd indicator illuminates when there is a problem with the 4wd system (its the "check engine light" for your 4wd system)
There will be a diagnostic trouble code stored
Most likely scenario...the module is bad (that]s the switch on the dash) but have it diagnosed before throwing a part at it.

The problem is, in order for the parts to be properly lubricated, you must use it occasionally. Try running it around for a bit in all ranges and the problem should disappear. What happens is that the sensors inside the t-case show that no lubricant is present and just needs a cycle of use to read correctly. Try that before any dealer or shop...just my $.02 Hope it helps!

Posted on Oct 04, 2010

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Posted on Jan 02, 2017

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1 Answer

My service 4wd light keeps coming on in my 2000 cadillac escalade what should i do and what should it cost me??


when the 4WD light comes on you more likely have problems in the 4WD low switch circuit.well this is a dealership fix.because your 4WD is pcm controlled.when 4WD light turn on pcm detected the transfer case ratio was 0.8 - 1.2 or during condition 2 with the 4WD low switch not in 4WD low, transfer case in 4WD low,tcc commanded on, tcc slip speed from 100 to 3000 rpm, the pcm detected the transfer case ratio was 2.5 - 2.9 all conditions met for 10 seconds.see dealership has to check.many things will cause your 4WD light to turn on.dealership has to hook up diagnostic equipment to find your problem and fix it.hate to tell you.they will charge $100.00 or more to trouble shoot.then charge for labor and new part.call around and get a price check.it will be good if your vechicle has a extended warranty.

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Service 4wd light on when switched to 4wd hi mode


This means theres a problem with the 4wd, you will need to scan the computer to the trany to see whats going on, may be a soleniod problem or a switch, when ever the computer sees a problem and turns on a service light it stores a code in memory telling you what the problem is, a scan tool is needed to retrive the codes.

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4wd service came on and won't go off


I Had this same problem a while ago. the 4WD setup in the cars computer is set to send out this service light after so long. what i did to solve the problem was, I Pulled the fuse to the 4WD system. than i ran the car for 5 to 10 min's and than replaced the fuse. it reset the computer and turned off the light. another thing you could do is rent a automotive computer diagnostic code reader and remove all error codes which would also turn off the light

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