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Discussion Starter #1 (Edited)
I have a 2007 Colorado 2.9L Manual Transmission. I changed the front axle actuator today, and searched the forums, with vague results. Sorry in advance if this is a repeat thread, but we are about to get hammered with snow this weekend.

Now my truck, when trying to shift into 4 high, makes a clicking and solenoid movement sound. The three lights on the dash for the 4WD, will blink when you push them, but then go back to 2WD shortly after. This happens for both 4 high and 4 low.

Please help with any suggestions or potential fixes. Thanks!
 

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Hello,
My name is Jason and I'm new to this site. I have a 2004 GMC Canyon and I am having similar problems. When I place the truck in park or neutral and push my 4wd indicator either on low or high it blinks and you can hear a grinding noise then a click. But once that happens the light shows it being in 4wd but only the power of the back wheels are engaged. Trust me we got 3 inches of snow this evening and was none to pleased with my ride home! Thanks for any suggestions or info thanks!
 

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I have a 2007 Colorado 2.9L Manual Transmission. I changed the front axle actuator today, and searched the forums, with vague results. Sorry in advance if this is a repeat thread, but we are about to get hammered with snow this weekend.

Now my truck, when trying to shift into 4 high, makes a clicking and solenoid movement sound. The three lights on the dash for the 4WD, will blink when you push them, but then go back to 2WD shortly after. This happens for both 4 high and 4 low.

Please help with any suggestions or potential fixes. Thanks!
If you are sure the actuator is working then you really only have the solenoid at the transfer case and control module under the seat. I had the control module go on mine, but it flashed and neither the actuator or solenoid did anything.

Hello,
My name is Jason and I'm new to this site. I have a 2004 GMC Canyon and I am having similar problems. When I place the truck in park or neutral and push my 4wd indicator either on low or high it blinks and you can hear a grinding noise then a click. But once that happens the light shows it being in 4wd but only the power of the back wheels are engaged. Trust me we got 3 inches of snow this evening and was none to pleased with my ride home! Thanks for any suggestions or info thanks!
If you put it in 4 low do you feel the gear reduction in the back tires? if so it's the front actuator. If it doesn't then it's likely the solenoid on the transfer case.
 

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Mine has a similar issue, and I have narrowed it down to one of the two sensors on the transfer case that detect shift position. Here is my situation:

When you push the 4x4 button, it flashes, truck stays in 2wd, even though you can hear the clicking and hear the solenoid move. However, if you put the truck in neutral or park and shut the truck off, when you restart it, the truck will be in 4x4, and the indicator shows 4x4 but flashes. I have been able to use the truck in 4x4 for some time this way, and since I don't have a garage and don't want to work outside in the snow, I will swap out the sensors when it warms up.

Try yours to see if it does the same - it may at least get you through the worst of the snow. A friends 2004 Colorado has the same issue, so I don't think it is all that uncommon.
 

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Discussion Starter #5
Where can I find the transfer case solenoid and the transfer case position sensors?

When I went to change the front axle actuator, I was not too pleased to find that it was broken off nearly to the threads. This truck was my wife's ex husbands, and apparently he didn't take much care of it.
 

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Discussion Starter #7 (Edited)

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The unit under the seat is the TCCM (Transfer Case Control Module). Check it to make sure it is dry and not corroded.
 

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I put mine in neutral and engage 4 high. You can hear it switch engage and then nothing. Dash lights on 4wd both blink and stay blinking. You can't feel it really do anything. I'm putting it in the garage this week to see what's going on. I will let you guys know. Thanks.
 

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I have a similar headache.

4cyl, manual, 4x4.

When I press the 4wd button, I can hear the transfer case motor going, the light blinks, then all lights go out and I get a service 4wd message on the cluster.

At first I thought for sure it was the TCCM, bought a new one, and it does the same thing. After some research on here I decided it must be the front axle actuator. I confirmed that after pressing the button and checking that the front drive shaft does engage, so it must be at the actuator. I Installed the new actuator and still no change. I even tried pressing the button with the actuator plugged in but not screwed in to the housing and confirmed nothing is happening at the actuator.

So its not the TCCM, its not the actuator, not the TCCM or frtaxle fuse. Im thinking it must be a ground, broken wire, or transfer case solenoid and the transfer case position sensors. Anything else it could be? Anyone else have the same symptoms? It seems like most people get blinking lights and nothing happening. My lights are going out and the service 4wd light is coming on
 

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Have a 2008 Colorado . Replaced actuator when the shaft turns it does not engage the front axle it just makes a grinding sound
 

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I had the same problem on my '04. I had to replace the bearings in the driver's side axle tube. There's a splined shaft in there and a collar that slides over it to lock the 2 front wheels together. When the bearing wears out that splined shaft no longer lines up correctly and the actuator attempts to slide the collar on to that shaft, but can't because it's not lined up correctly. Parts are cheap bearing for the axle tube and a new seal for the end where the CV axle slides in. Here's a video of how to do it:
 

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I tried parts_guy's approach pushing the 4wd hi button while in neutral (or park), light on 4wd hi button keeps flashing and it doesn't go into 4wd. Then I shut the key off. When I restarted I found it was in 4wd hi. First time I tried it went back into 2wd OK when I pushed that button. However, on second try, I had a heck of a time getting it to return to 2wd. It took several tries, a little driving around, a little back and forth, more pushing of the 2wd button, maybe even another restart, but finally 4wd disengaged.
 

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So I disconnected the wiring and took the front axle actuator out. The plunger is retracted. Then I plugged the actuator back in and pushed the 4WD button, nothing happened with the actuator. I want to test it to see if the actuator is at fault, or if the problem lies with it not getting signal or power. The connector has green, black. black/white and reddish-orange leads. Which are the power wires that I could connect directly to 12 volt to see it it's working, and/or I could connect a test light to the connector and see it it's got power to it when the button is pushed?
 

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I don't think it's the actuator, which is the first thing most people seem to blame. Strange that I don't recall anyone posting back that after replacing the actuator the problem was fixed.Your issue sounds like a failed 2/4 transfer case switch.
 

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I don't think it's the actuator, which is the first thing most people seem to blame. Strange that I don't recall anyone posting back that after replacing the actuator the problem was fixed.Your issue sounds like a failed 2/4 transfer case switch.
Yes, it does, but when I connect 12v. directly to the removed actuator, nothing happens. Even tried grounding in a couple of different locations.
 

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I don't think it's the actuator, which is the first thing most people seem to blame. Strange that I don't recall anyone posting back that after replacing the actuator the problem was fixed.Your issue sounds like a failed 2/4 transfer case switch.
It doesn't shift into 4Lo. Wouldn't it shift into 4Lo even if the transfer case switch were bad?
 

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It doesn't shift into 4Lo. Wouldn't it shift into 4Lo even if the transfer case switch were bad?
When my truck had the similar issue that you describe I never got as far as diagnosing the actuator because I first tried testing the 2/4 switch. I tried the following.
With truck in drive creep forward and push 4 High.
Come to a complete stop in DRIVE , shut off ignition.
Shift to park or neutral , restart engine.
Drive forward and attempt to turn in either direction. If you fell the grab of 4 wheel drive I would strongly believe the 2/4 switch is bad. Note , even if you feel the 4 wheel drive the light will not be on solid.
When I went to the dealership for the switch I explained to them what was going on and they agreed it was the switch and not the actuator. I think you are on the right path to testing the actuator but I believe you need the following.
A 12v lead, ground , and a third ground for the switch.
 

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Did a bit more digging and I believe this is how to test the actuator. If your actuator has 5 pins , and you already know which is the 12 volt and the ground , the center pin is the second ground . Remove the actuator and hook up a 12 volt source and a ground as you did before and then make contact between the center pin and ground. If the actuator is good you should see movement when the center pin is touched to the ground.
340405
 

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Did a bit more digging and I believe this is how to test the actuator. If your actuator has 5 pins , and you already know which is the 12 volt and the ground , the center pin is the second ground . Remove the actuator and hook up a 12 volt source and a ground as you did before and then make contact between the center pin and ground. If the actuator is good you should see movement when the center pin is touched to the ground. View attachment 340405
In your photo, the connector pin at the lower right, though in my actuator too, is connected to nothing. That pin location is empty in the connector on the end of the wires that go to the actuator. Does that in any away change the diagnosis perocedure you outlined above?
 
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