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Hey guys, I just tried to back out of my garage and my truck wont go forward or reverse? I have 7300 km's on it! It drove completely fine last night and now nothing. I hooked up my code reader and it showed a p0841 (tranny fluid pressure sensor out of range ) so i cleared it and now it hasn't shown any other codes but the truck wont move. Anything I can try?:help1:
 

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Discussion Starter #2
68 rfe 911

bump, someone must have had issues with this before
 

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Is your truck a 4x4? If so, first verify that the transfer case didn't inadvertently shift itself into Neutral.

The P0841 is an LR pressure switch rationality fault, which could be caused by loss of line pressure. About the only thing I can think of that would give you no drive any gear (other than a broken input or output shaft, which is unlikely given it worked the day before) is loss of line pressure. Is the fluid level correct? I presume no big red puddles underneath?

If you have a scan tool, can you read line pressure with it? The trans has a line pressure sensor. Do you feel any engagement at all when you put it in gear?
 

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Discussion Starter #4
68 rfe

Is your truck a 4x4? If so, first verify that the transfer case didn't inadvertently shift itself into Neutral.

The P0841 is an LR pressure switch rationality fault, which could be caused by loss of line pressure. About the only thing I can think of that would give you no drive any gear (other than a broken input or output shaft, which is unlikely given it worked the day before) is loss of line pressure. Is the fluid level correct? I presume no big red puddles underneath?

If you have a scan tool, can you read line pressure with it? The trans has a line pressure sensor. Do you feel any engagement at all when you put it in gear?
The truck is 4x4, i tried the transfer case several times.Fluid level is perfect,I removed 4 seperate wiring harness plugs and checked all the wiring and for moisture issues. The truck doesn't engage at all in any gear, I tried tow/haul manual, drive , and reverse and not one of them engages at all. I got my first tow truck on its way with 7300km on my truck.:banghead:
 

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Is your truck a 4x4? If so, first verify that the transfer case didn't inadvertently shift itself into Neutral.

The P0841 is an LR pressure switch rationality fault, which could be caused by loss of line pressure. About the only thing I can think of that would give you no drive any gear (other than a broken input or output shaft, which is unlikely given it worked the day before) is loss of line pressure. Is the fluid level correct? I presume no big red puddles underneath?

If you have a scan tool, can you read line pressure with it? The trans has a line pressure sensor. Do you feel any engagement at all when you put it in gear?
Beat me to it.....I was gonna tell him to check his ATF level. :thumbsup:

But if that's fine, then you might have a bad TCM (Transmission Control Module). That would be under warranty.
 

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We've seen some trucks lately where the main sump filter snout popped out of the bore in the pump. So the good news is that's it's still under warranty and it should be a quick repair. Have the dealer check line pressure in Park with the scan tool. Odds are it will read 30 psi (which is the min reading - anything below 30 [like zero] will still display as 30). If that's the case, have them drop the pan and check the sump filter. If it's disengaged from the pump, check to make sure the plastic isn't cracked anywhere. If the filter is OK, they should be able to just reinstall it (properly) and you should be good to go.

If you could post (or PM me) your VIN number (the last 8 digits is all I need), that would be helpful. Sorry for the hassle with your new truck. We are still trying to determine why some of the filters are popping out, but at this point I suspect improper installation at the transmission plant.
 

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Hey, I was talking with another engineer about your problem, and he pointed out that converter drainback can cause this. If the oil drains partially out of your torque converter (while sitting overnight) then you get a slug of air inside the converter. When you start the vehicle up in the morning, that slug of air is forced out through the oil cooler and then comes back (through the spin-on cooler return filter) to the pump suction passage (where the main sump filter is hooked up). This can apparently cause a pressure pulse, which in some cases can blow the sump filter out of the pump bore (or split it open at the edge seam).

Why am I telling you this? Because when we see drainback issues, they are often caused by a defective diaphragm inside the spin-on cooler return filter. This diaphragm normally prevents converter drainback, but if it is weak then perhaps that is the root cause of your problem. So.... ask your dealer to REPLACE the spin-on cooler return filter, just in case you got a bad one. As I said, you should be able to re-use the main sump filter, if it's not cracked or split open. The spin-on filter is P/N 05179267AC.
 

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Discussion Starter #8
Thanks for the info Transengineer, I will contact the dealership and see if this helps them.
 

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The exact same thing happened to me last week. Had it towed into the dealership and the filter had dropped out of position. They dropped the pan and put the filter back in and away I went.

My worry is how much long term damage is done to the transmission with no oil getting to the clutch plates.

When My truck wouldnt move it was blocking the end of my driveway. SO I put my foot to the floor while it was in drive and it crawled back up my driveway 20ft so I could use the wifes vehicle. When I got out there was a distinct smell.

If anyone hears this is a ongoing problem and there is a recall please PM me.
 

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Discussion Starter #10 (Edited)
Warranty bs

I just got my truck back today, it was the same problem with the filter. I bought my truck 3 hours away from home and had a lift,tires etc done at the dealership before I picked up the truck. I got a call right away from my local dealership saying I voided my warranty and they can't touch my truck because of the lift:shock: I called the dealership where I bought the truck and and they finally came to an agreement with the local dealership to look at the truck. The part that reallly gets me is they even told me that this filter had been a problem with several trucks previously at the local dealership but because my truck had a lift they can't work on it. I asked if this would be an ongoing issue if I brought my truck in for maintance and warranty work and they said they wouldn't touch my truck again. I guess I should order up the minimaxx and exhaust and start saving money on fuel if I don't have any warranty now:peelout
 

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I just got my truck back today, it was the same problem with the filter. I bought my truck 3 hours away from home and had a lift,tires etc done at the dealership before I picked up the truck. I got a call right away from my local dealership saying I voided my warranty and they can't touch my truck because of the lift:shock: I called the dealership where I bought the truck and and they finally came to an agreement with the local dealership to look at the truck. The part that reallly gets me is they even told me that this filter had been a problem with several trucks previously at the local dealership but because my truck had a lift they can't work on it. I asked if this would be an ongoing issue if I brought my truck in for maintance and warranty work and they said they wouldn't touch my truck again. I guess I should order up the minimaxx and exhaust and start saving money on fuel if I don't have any warranty now:peelout
They can void parts of the warranty for that but not all of it. They have to prove the mod caused the problem to void the warranty. Otherwise call a lawyer and have them ask the dealership about their warranty practices.

Once you remove the pollution equipment and legally make it off road use only all bets are off. All warranties have an exclusion for racing/competition vehicles. When you do the deletes you either did that or you are breaking the law and you don't want to get in a p!$$!ng contest when you loose either way.
 

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The exact same thing happened to me last week. Had it towed into the dealership and the filter had dropped out of position. They dropped the pan and put the filter back in and away I went.

My worry is how much long term damage is done to the transmission with no oil getting to the clutch plates.

When My truck wouldnt move it was blocking the end of my driveway. SO I put my foot to the floor while it was in drive and it crawled back up my driveway 20ft so I could use the wifes vehicle. When I got out there was a distinct smell.

If anyone hears this is a ongoing problem and there is a recall please PM me.
OUCH!!

Unfortunately, it is likely that you burned your UD clutch, by trying to move the vehicle with little or no line pressure.

Take it back to the dealership, and ask them to run a 1st gear clutch slip test (which they can do using a scan tool). Basically, they will put it in Drive (1st gear) at a dead stop (brakes applied) and monitor the input speed while they briefly open the throttle all the way. The input speed should stay at zero. If they see any input speed (other than a brief blip to maybe 30 rpm as the torque is applied), then the UD clutch is slipping, and they'll need to tear it down and replace the input clutches. It's still under warranty, I hope.

If you pass the clutch slip test, consider yourself lucky. Your UD clutch is still holding OK.
 

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They can void parts of the warranty for that but not all of it. They have to prove the mod caused the problem to void the warranty. Otherwise call a lawyer and have them ask the dealership about their warranty practices.
They can void whatever they want... they don't have to prove anything, YOU and your lawyer do! Don't know about you, but lawyers in this area are pricey! :(
 
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