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Won’t go in reverse…..

ncbowhunter

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ncbowhunter Enthusiast

ncbowhunter

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Won’t go in reverse…..

 

Long story so here it goes….. I have a 2006 Chevrolet Silverado Crew Cab 4x4 (5.3l / Auto transmission / electronic 4x4 – Auto, 2wd, 4L, 4H) with 120k miles.

I’m driving my truck (2wd mode) and I pull up to my house, get out and go inside with the truck still running. I get back in my truck and put in reverse and it’s like my truck is in neutral. I put it back in park, then back to reverse, I hear a grinding noise, but again it acts like it’s still in neutral. I speak with a couple mechanics thinking I have a transmission problem. Sure enough unanimous everyone is pointing to the transmission.

 

I take it to a reputable tranny guy and he says most likely the shell is broke. He drops the tranny pulls it apart…. Says there’s minimal wear, no broke shell, but rebuilds it anyway since he has it apart. After the tranny is rebuilt he too cannot get the truck in reverse (2wd mode), so basically at this point I’m $1100 in the hole and still have the problem. He plays around and put the truck in “Auto mode” and suddenly the reverse starts working… all is good. He recommends the issue being a broke tooth in the transfer case…. Says its terminal but all fluids were full in the TC, etc…..

 

While in Auto mode I have the need to drive through a ditch… thinking I will get stuck… I feel the 4wd lock in and I drive right through it. Fast forward since… I’ve drove on the beach 2 times in Auto mode (loose sand not Daytona) and both times the 4wd locked in and drove without issues.

 

I’ve been driving in auto mode for about 2 months. I take it to a mechanic today and he replaces the 4wd electronic switch with no luck. He tries to read the code but for some reason there’s no power to my code cord?? He’s now leaning to a computer issue or the actuator motors….. ANY HELP WOULD BE GREATLY APPRECIATED!!!!!

carkhz316 Enthusiast

carkhz316

Posted
Posted

When it was acting up, would it go fowards but just not reverse? Just for the heck of it, lift the whole truck off the ground and when in 4WD/ auto, see if the rear wheels are being powered. If not, then you definitely have an issue with the T-case. 

Supreme Pizza Senior Enthusiast

Supreme Pizza

Posted
Posted

I have seen these problems before. Your transfer case is to blame. Possibly a bad encoder motor or encoder ring. It is not a good idea to drive around in 4 Auto all the time. Your truck was not designed to do that. You should only use 4 Auto when you are on a road with patches of snow, towing uphill on gravel, or perhaps certain off-road conditions. Driving around all the time in 4 Auto locks in the front end, and causes significant wear and tear, as well as lower fuel mileage. If you MUST use 4 Auto, only activate it when you need to back up, but turn it off when driving forward. 

 

Also, make sure you have the proper fluid. The automatic T-Case requires a very specific fluid. 

 

 

 

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ncbowhunter Enthusiast

ncbowhunter

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On 8/9/2018 at 11:20 PM, carkhz316 said:

When it was acting up, would it go fowards but just not reverse? Just for the heck of it, lift the whole truck off the ground and when in 4WD/ auto, see if the rear wheels are being powered. If not, then you definitely have an issue with the T-case. 

Yes. It would shift fine in forward gears. 

Tahoe02 Enthusiast

Tahoe02

Posted
Posted

+1 on swathdivers recommendation. Too bad the tranny guy won't take care of the transfer case if that turns out to be the issue. Maybe you pay for parts and he takes care of the labor since he thought it was the tranny. We have suggestions for saving you money on parts like Ebay with better pricing, free shipping and no tax. I feel for you dropping $1100 and not a fix.

ncbowhunter Enthusiast

ncbowhunter

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1 hour ago, swathdiver said:

Guessing games cost lots of money, get a Tech2 and see what's going on inside.

What is a tech2? I took it to a local mechanic Thursday. He ruled out the instrument switch. He tried to read the code (maybe he did say tech2) but there was no power to the plugin? So he didn’t have a lot of time to work on it and told me to come back Monday. He was leaning towards an encoder motor or a computer. He says he’s first got to figure out why there’s no power at the plug reader?

ncbowhunter Enthusiast

ncbowhunter

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2 minutes ago, Tahoe02 said:

+1 on swathdivers recommendation. Too bad the tranny guy won't take care of the transfer case if that turns out to be the issue. Maybe you pay for parts and he takes care of the labor since he thought it was the tranny. We have suggestions for saving you money on parts like Ebay with better pricing, free shipping and no tax. I feel for you dropping $1100 and not a fix.

Yeah the tranny guy said he doesn’t work on TC. Says you have to have special tools and they aren’t simple like the old days... go figure. 

swathdiver Senior Enthusiast

swathdiver

Posted
Posted
1 hour ago, ncbowhunter said:

What is a tech2? I took it to a local mechanic Thursday. He ruled out the instrument switch. He tried to read the code (maybe he did say tech2) but there was no power to the plugin? So he didn’t have a lot of time to work on it and told me to come back Monday. He was leaning towards an encoder motor or a computer. He says he’s first got to figure out why there’s no power at the plug reader?

The Tech2 was the computer that the dealerships use to work on these trucks.  Besides reading codes, it can test, read just about everything and be use to program modules and a whole lot of other stuff.  It's more important than a wrench.  For without it, you're throwing parts and money at a problem.  I don't buy that the OBD connector is not working.  Now if the scan tool cannot communicate with the TCCM (Transfer Case Control Module) and the wiring is good, then it is probably bad.  Could be that his scan tool is not good enough to talk to it too.  That's why we should have the same tools that the dealer uses.

 

Prices have come way down, $300-400 delivered depending on options.  Get software 33.004.  Then get subscription to shop manual from AllDataDIY or buy in pdf form from SeriousCTBuyer on ebay.  They go hand in hand.  Tech2 will pay for itself in no time.  This problem has already cost you $1100.

ncbowhunter Enthusiast

ncbowhunter

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17 minutes ago, starman8tdc said:

Anything is possible. 

Saw a thread on another forum that sounded like the same problem as what I’m having and he said it was the module on the transfer case... wondering if he meant the Transfer Case Control Module.... not necessarily mounted on the TC. 

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