I've been getting a "check 4 Wheel Drive" light for a few weeks now. Don't know what to check. The 2 wheel indicator light keeps going off at times and I have to keep pushing the button to get it to come back on. Truck turns stiff as if it is in 4 high. Tried going to 4 Auto and 4 High. Liked to never got it to change back to 2 High in both cases. Any suggestions?
Not true that GM dealer is the only one that can fix it . There are other independent repair shops that can, Transmission repair shops like AAMCO . You could too if you had access to a scan tool that can read DTC'S - diagnostic trouble codes for the 4X4 system . There is a 4X4 control module that can store DTC'S when problems happen . When a warning like check 4 Wheel Drive light's up ,it's not meant for you to do anything except take it to the dealer ,well ,that's what the dealer would like .
Would need to know which 4X4 transfer case your's has ? Two speed manual , two speed selectable , two speed automatic ?
Their are a few different one's
Transfer Case - BW 4401 (Two Speed Manual)
Transfer Case - BW 4470 (Two Speed Manual)
Transfer Case - NVG 241-NP2 (Two Speed Manual)
Transfer Case - NVG 243-NP1 (Two Speed Selectable)
Transfer Case - NVG 246-NP8 (Two Speed Automatic)
Two speed Automatic system can set a number of codes
DTC B0768 Service Indicator Circuit High
DTC B2725 ATC Mode Switch Circuit Malfunction
DTC C0300 Rear Speed Sensor Malfunction
DTC C0305 Front Speed Sensor Malfunction
DTC C0308 Motor A/B Circuit Low
DTC C0309 Motor A/B Circuit High
DTC C0310 Motor A/B Circuit Open
DTC C0315 Motor Ground Circuit Open
DTC C0323 T-Case Lock Circuit Low
DTC C0324 T-Case Lock Circuit High
DTC C0327 Encoder Circuit Malfunction
DTC C0357 Park Switch Circuit High
DTC C0362 4LO Discrete Output Circuit High
DTC C0367 Front Axle Control Circuit High
DTC C0374 General System Malfunction
DTC C0376 Front/Rear Shaft Speed Mismatch
DTC C0387 Unable to Perform Shift
DTC C0550 ECU Malfunction
DTC C0611 VIN Information Error
Without having this info you could go round an round an never find the problem .
SOURCE: 4 wheel low works but 4 wheel high does not.
sounds like the encoder on the side of the trans on the drivers side
SOURCE: when you push the 4
a lot of 4wd you have to back up for a few feet to disengage the hubs after you tourn them back to 2wd
SOURCE: 4 wheel drive on my jimmy won't engage
try disconecting the battery to reset service light may not solve the problem but should allow u to put truck into 4 wheel
SOURCE: Front drive, 4 Wheel drive won't engage
Check the switch on the transfercase remove the vacume lines if there is oil in them the switch has to be replaced and the lines should be cleaned out you should also check under the battery tray to make sure the boot is not ripped that controls the leaver to engage the front axel
SOURCE: 4x4 will not engage in 96 gmc yukon
I just fixed a friend of mines 96 yukon...shift to neutral press 4H and u can hear the actuator make noise (we even replaced it with a new one his idea and the same thing happen as old one), so as he hit the switch for 4H i layed under it (on 4 jack stands) and I could hear the motor on the transfer case make a loud noise (well thats working) and before all this I asked him did u check all your fuses (he said guarnteed to be all good) one night it was bothering me so i looked through the owner manual for the yukon and in the fuse box on driver side by the door there are (2) fuse for the 4wheel drive unit,pull one of the fuses good...pulled the other one and it was blown put in a new fuse and it works like brand new..pull fuse for anything that has to do with 4 wheel drive componants,
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I have a 2003 Suburban. When I start my suburban, it will be in 4L or 4H or the red light N, or no indication at all. My Service 4WD light will come on after a while. Other times it will already be set in 4 wheel low. Sometimes it works fine. What to do?
I have a 2003 Suburban. When I start my suburban, it will be in 4L or 4H or the red light N, or no indication at all. My Service 4WD light will come on after a while. Other times it will already be set in 4 wheel low. Sometimes it works fine. What to do?
i have 2000 chevy 1500 four wheel drive got same problem as other guy jdemaree's light keeps coming on i switch two four wheel drive have hard time getting back in two wheel drive
The "service 4 wheel drive" light keeps coming on. I am told only a GMC dealer can fix it an if is not fixed it may not be able to switch to 4 wheel drive.
Any suggestions?
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