Question about 1999 GMC Jimmy

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Jimmy wont lock in four wheel drive.

My 1999 jimmy will not shift into four wheel drive. It will not lock in 4hi 4lo or auto. the light will blink and blink for about a minute and then return to 2hi. What is the problem?

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  • thebasement1 Jan 07, 2009

    Our garage told us it is the transfer case control module, which is not grounding the vacuum control switch. Confused yet? Yeah, me too. In any case they said I had to take it to a GM dealer because the TCCM needed to be reprogrammed.

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My 01 blazer is doing the same thing have you found out what is doing it

Posted on Nov 27, 2013

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You need to see if the transfer case engagement motor is defective.

Posted on Nov 21, 2008

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1 Answer

4 wheel drive won't engage


Which do you have ?
Transfer Case - NVG 236 (Two Speed Automatic)
Transfer Case - NVG 233-NP1 (Two Speed Selectable)
The NV236 transfer case is an automatic transfer case with three drive ranges. Shifting from rear wheel drive to four wheel drive is done automatically when the transfer case shift control module receives wheel rotating slip information from the speed sensors. The transfer case shift control module then engages the transfer case motor/encoder to position the transfer case from rear to four wheel drive. When the transfer case shift control module receives information that the wheel rotation is the same on both axles, the transfer case shift control module sends position information to the motor/encoder to put the transfer case back into rear wheel drive. The three drive ranges are 2HI, 4HI, and 4LO. The 2HI position is for normal driving with the rear wheels pushing the vehicle. The 4HI, position is for driving through sand, snow, mud, gravel, or heavy rain at normal or slightly below normal speeds. The 4HI engages the front axle to allow for four wheel drive. The front axle is pulling the vehicle, and the rear axle is pushing the vehicle. The 4LO range is used for off road driving, heavy snow, deep mud, or shallow fording. The 4LO is similar to the 4HI except that the gearing in the transfer case is set for low speed and high torque. The NV236 is manufactured at Syracuse New York by New Venture Gear a division of New Process Gear for General Motors.
Is the switch light on or flashing ? If you have automatic 4x4 there are several DTC'S that can set >
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 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

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when deactivating youre four wheel drive make sure youre rig is in nautral this helps with the gears lining up. whan youre 2-hi light flashes hit a second time. Ive had this problem befor.

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Not locking in 4 high when light is on tell you that it is in four high so front wheel not turning and wont shift into four low or back


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