Question about 2000 Chevrolet Blazer

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Shifts to 4lo sometimes when I start engine. Dealer says I need new 4WD control module? $850.00 ?? any thoughts?

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It's certainly possible. I've put in my fair share of modules in these but I've also put in about an equal number of transfer case encoder motors [the part that does the shifting and reports back on what gear the transfer case is in] and shift select switches [the part that tells the transfer case module what gear you want to be in]. If you're uncomfortable with the dealers diagnosis it wouldn't hurt to check at another place to see what they think. If you decide to go with the dealers diagnosis just ask for the old parts back which would be proof that they replaced what was wrong and that it repaired the problem and you should be ok. The modules are very expensive on these so it is a bit of a sticker shock when replacing one. Good luck, hope it all works out for you.

Posted on Jul 29, 2010

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1 Answer

How do I fix my 99 blazer the dome lights won't turn on and the 4 who drive won't light up or work


In the instrument panel fuse box fuse # 8 CTSY LP 10A ,that's for the dome lights, fuse panel is left side of IP. What are you talking about 4 who drive won't light up or work ? 4 wheel drive ? Do you have two speed automatic or two speed selectable ?
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Circuit Description

The indicator lamps circuits consist of 5 individual lamps contained inside the mode/range switch assembly, they are AUTO, 4WD, 2HI, 4HI, 4LO and NEUTRAL. The AUTO, 4WD, 2HI, 4HI, and 4LO lamps are contained inside their respective range button. When the ignition is ON, the transfer case shift control module illuminates the indicator lamp that corresponds to the current ATC gear position by providing a ground through a current limiting driver.
The transfer case shift control module flashes each indicator lamp after a shift has been requested and will continue to flash until the transfer case shift control module can complete the shift. After a shift to AUTO, 4WD, 2HI, 4HI, or 4LO is made, the transfer case shift control module will flash that indicator lamp until the transfer case shift control module receives a high voltage signal on CKT 1695 from the front axle switch.
A solid state circuit located inside the switch supplies ignition voltage to the lamps. The solid state circuit also receives voltage whenever the headlamp switch is in park or headlamp position. When the solid state circuit receives voltage from the headlamp switch it will reduce the voltage that it supplies to the indicator lamps, dimming the lamps when the headlamps are ON.

Feb 07, 2015 | Cars & Trucks

1 Answer

Which fuse is the one for the 4/4 switch on the 2001 ranger xlt


All fuses supply power to the four wheel drive control module , the control module supplies power to mode select switch . The 4WD control module accomplishes shifts by interpreting inputs from the following:
  • mode select switch (MSS)
  • vehicle speed signal
  • encoder plate position
  • brake pedal switch
  • digital transmission range (TR) sensor
  • ignition switch
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  • Based on these inputs, the 4WD control module controls the shifts into 2WD, 4WD HIGH or 4WD LOW with the following outputs:
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  • Central junction box (CJB) fuse:
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    • If the concern remains after the inspection, connect the diagnostic tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the diagnostic tool menu.

Jan 02, 2015 | Cars & Trucks

1 Answer

Co326


.DTC C0326 08: Transfer Case Lock System Performance Signal Invalid.
The transfer case shift control module controls the transfer case lock solenoid. The transfer case lock solenoid is released by being energized. This is accomplished by grounding the lock solenoid control circuit during gears shifts, and in the AUTO 4WD mode. Locking action is applied when power or ground are taken away from the lock solenoid, the transfer case motor is prevented from moving. The system is capable of providing a 2HI, 4HI and 4LO lock-up without the need of additional vehicle power to hold the transfer case in these positions. This DTC detects a lock solenoid that is mechanically unable to hold when in the locked state.

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My 2005 Yukon will not switch out of 4wd low.


I'm assuming you have operated your 4WD before, and you know the tranny has to be shifted into neutral to engage and disengage 4LO (I'd try that first). Other than that they are bad for the 4wd Switches failing, (but usually one or more lights are flashing) and if its locked in 4LO you probably have a TCCM (Transfer case control module) problem. For the record there is no need to ever use 4LO, unless you are extremely stuck in the bush somewhere, there is no advantage on the street.

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1 Answer

04 Trailblazer LS won't go into 4WD. Front hubs don't engage with switch in cab. It will gear down to 4wd Lo but front wheels won't engage. Please help. Can't afford the dealer!


What do the lights on the 4x4 selector switch do when you switch to A4WD or $HI or 4LO positions? Do they blink and revert to previous selection? Has the Transfer Case fluid been changed at 50K intervals?
There are actuators on the Transfer Case and Front Differential that control the application of power to the front wheels. These actuators are controlled by the TCCM (Transfer Case Control Module). It takes a qualified 4 wheel drive technician to diagnose these systems.

Jan 09, 2011 | 2005 Chevrolet TrailBlazer

1 Answer

Something is wrong with the 4WD. Will engage in neutral to 4WD Lo which means the vaccum is probably working but 4WD Hi will not engage. I have tried resetting the control module as described in the owners...


what you are most likely feeling is in 4lo the transfer case drops the gear ratio and 4hi just locks the front differential in. do you know if the front axle is locking in in 4lo? i suspect you have a vacuum issue to the front actuator and this is why. there is a vacuum switch on top of transfer case that will stick and cause problems and sometimes the vacuum lines will pop off of this switch.check and see if you are getting vacuum to the actuator if not follow lines be sure one is not broken if you are then actuator is bad

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3 Answers

4WD LO will not disengage what can cause this.


@ 2000 gmc: Exactly right.

asker: Also, it helps if you're rolling at about 2 mph with the steering wheels straight.
You cannot shift into 4LO with the wheels turned or when in a drive
gear. Also, it may be that you need the electric shift unit serviced.
It is not recommended to drive on dry pavement while in 4LO.

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the transfer case module is bad it is bolted to transfer case above front drive shaft

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You need to get it scanned for codes, if you have a B2725 then you have a 4WD switch problem, otherwise the fault is probably in the transfer case control module.

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2 Answers

Service 4wd


If you had the switch and encoder motor replaced 5 months ago, then you have warranty. You need to return to the dealer and have them pull codes to see if it is the C0327 again. Some of these trucks also had grounding issues for the 4wd module. If it is the same c0327 code stay on them and make them confirm their original diagnosis.

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