Last post on Nov 02, 2013 at 6:36 AM
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Dodge Dakota, Truck
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#552 of 1029 Re: 2002 dakota 4x4 sport overdrive kicking out [ndc]
Mar 03, 2009 (5:50 pm)
Based on your numbers there is something definitely wrong. The Low Reverse clutch pressure is too high, the 2C clutch and Overdrive clutch pressures seem within range. I consulted with a Dodge tranny tech and he thinks the Underdrive clutch pressure is too low.
The 4C clutch pressure doesn't make any sense since you say that after being warmed up it drives okay. Basically at zero it's telling you that the 4C clutch requires absolutely no pressure to apply which doesn't make sense if it drives. This could be an erroneous reading I suppose.
The rebuilding quote seems unreasonably high. Heck, you could probably buy a brand new complete transmission across the parts counter for nearly that price. Unless this transmission's been abused, I would suspect that most of the hard components are still good (panetaries, shafts, etc.). You might need clutches or maybe a valve body, but that would be just speculation. You really don't know until you pull it apart.
You know, it might pay to get a second opinion.
#553 of 1029 Re: 2002 dakota 4x4 sport overdrive kicking out [dustyk]
Mar 03, 2009 (6:53 pm)
Thanks for all the info. I think the first thing I'll do is get a second opinion.
I might try changing a few sensors just to make myself feel better about a rebuild. I guess it just doesn't seem right that its fine after it warms up.
I'll be sure to keep you updated to the problem.
#554 of 1029 Re: 2002 dakota 4x4 sport overdrive kicking out [ndc]
Mar 04, 2009 (6:02 pm)
The 545RFE has been out better than eight years and in that time I've heard of one major failure, and that was a broken sun gear on a 2000 Cherokee. I asked my Dodge guy the other day and another transmission tech. yesterday if they've seen any 545RFEs apart. I figured that after eight years you'd start seeing a few. Neither have had an opportunity to do a rebuild, in fact both said they've never removed one from a vehicle. Anything that's gone wrong was correctable either with a reflash or pulling the pan.
I've heard of two sensor failures on a 545RFE, both on the net. As mentioned before, there was a bent accumulator plate issue, but that was assembly related and fixed a long time ago. The guys I've talked to seem to think most problems are fluid related as each said the most they taken apart were valve bodies.
I did think about your symptom and the goofy no pressure on the 4C clutch. I don't know if this is possible with this design, but maybe the 4C clutch is hung up. I can't think of another reason to get a zero pressure reading other than the reading is false, or you have a bad computer. I'd be tempted to erase the PCM and reflash the computer just to see what the effect would be..
By all means, let us know what the end result is.
#555 of 1029 1988 Dakota no overdrive or lockup below 40F
Mar 04, 2009 (9:51 pm)
I have a 1988 dakota 4x4 with a 3.9L and the auto overdrive transmission. The truck has 74,000 original miles on it. I purchased it off of an elderly gentleman that could not drive no longer. I have gave it a complete tune up, changed the trans fluid (ATF+4), and replaced the coolant temperature sensor.
On to the problem. When the temperature is less than 40 degrees outside the truck will not shift into overdrive or use lockup from what I can tell. I have a 15 mile commute so there is plenty of time to get the truck fully warmed up. The trans shifts perfectly otherwise. You can feel all of the gears engaging and lockup when the temperature is warmer.
I have read through all 56 pages looking for a similar problem but have found none. Hopefully somebody here can head me in the right direction to cure this problem. Thanks.
#556 of 1029 Re: 1988 Dakota no overdrive or lockup below 40F [jvinzant]
Mar 07, 2009 (5:23 am)
By design the transmission will not shift into overdrive or go into converter lock-up until the transmission fluid temperature reaches a certain temperature on newer Mopars, usually at 80 degrees F. Your '88 probably has a A518 transmission and I'm not sure it had this design feature, but I don't believe it did. If it did, there is a fluid temperature sensor inside the transmission.
Have you tried replacing the Throttle Position Sensor? Have you checked the Throttle Valve Cable adjustment?
#557 of 1029 Re: 1988 Dakota no overdrive or lockup below 40F [jvinzant]
Mar 07, 2009 (10:08 am)
Well, I'm pretty sure that 1988 was the first year of the four-speed automatic in the Dakota. Whether this was a A518 or an A999 I'm not sure.
I consulted some experts this morning and there was some discussion about this problem. The electronic governor was not adopted until the following year (1989), however a Dodge transmission tech. believes that lock-up was prevented by temperature on the four-speed RWD transmissions before the advent of the electronic governor.
Look for a sensor in one of the transmission lines (it should be the return line). This would be mounted directly to the steel tubing and use two wires. I'm not certain about this, but my memory is probably the weakest of the two consulting technicians. (It's definitely the oldest!!!) I don't recall a sensor like this used in a Dodge application.
If there is no temperature sensor in one of the transmission lines going to the radiator, collectively we are drawing a blank on this one. None of us can ever remember a condition like the one you are describing.
I think lock-up was controller directly by the PCM in those days, which means it operated the lock-up solenoid. There is a temperature circuit in the older PCMs used for some emission related operations. Maybe that is where the problem. From a pure hydraulic standpoint, I don't have much to offer as far as suggestions except what I've already mentioned.
#558 of 1029 Re: 2002 dakota 4x4 sport overdrive kicking out [dustyk]
Mar 08, 2009 (4:08 pm)
hey dusty tried the filters and relearn nothing changed dealer said underdrive ???
so i've replaced trans with a used one and all works great except really hard 2/3 shift feels like someone hit you from behind any ideas ?
#559 of 1029 Re: 2002 dakota 4x4 sport overdrive kicking out [02flhtc]
Mar 08, 2009 (6:17 pm)
There are a number of things that could cause this problem. If the 2-3 shift seems to get better the more you drive, it may just need to build a shift schedule by learning. This can be done more quickly performing the TCM Quick Learn procedure with a DRB3 Scan Tool. This would also give you an opportunity to scan for codes. I'd also recommend getting the TCM reflashed with the latest updates.
Make sure the gearshift cable is adjusted poroperly.
There could be a problem with either the Input Speed or Output Speed Sensors. As far as that goes, the old Throttle Position Sensor may cause this as well.
#560 of 1029 99 Dakota with a weak Overdrive
Mar 09, 2009 (12:34 pm)
I have a 99 Dakota with a 3.9L Auto, 143K miles with original engine and transmission. The truck has had regular maintenance its entire life, no major problems so far. I had the transmission rebuilt a year ago at 130K. The engine runs great, and transmission runs great...
... except lately I don't have much of an Overdrive. When I say this, the truck shifts fine (normal) between 1st and 3rd, but is VERY reluctant to shift into overdrive. The only way I can get it to shift into 4th is to maintain about 40-45MPH and hold the gas as lightly as possible. But even then, as soon as I push the pedal to accelerate, it instantly drops back into 3rd. I was somewhat nervous about pushing speeds more than 50MPH, but can try if needed.
It started doing this progressively more and more starting about 2 months ago, and has gotten to the point of which it won't hold in OD at all anymore. It doesn't seem to be temperature related, it does the same cold or hot. I didn't get any error code until 2 weeks ago. I took it to Autozone and he said it was (surprise) a shift error between 3rd and 4th.
What would be the first thing to do to try to fix this? I am comfortable pulling the pan if needed. Any help would be GREATLY appreciated. Thanks!
#561 of 1029 Re: 1988 Dakota no overdrive or lockup below 40F [dustyk]
Mar 09, 2009 (12:45 pm)
I checked up and down for a sensor strapped to the trans lines. I could not see anything. It also don't help that the previous owner replaced the old rusted lines. There are short sections of remaining line left but no sensors. I have looked for tucked wires hoping maybe the sensor was removed and stuffed somwhere, no luck.
We did have upper 50's lower 60's here last Friday and the overdrive was working at least 50% of the time. I at least know the overdrive works but sure would like to know how to keep it working. I have a Clymer manual for the truck but it does not have specific wiring diagrams. It does show a temp sensor in the layout of the harness but no details about it. I called the local Dodge dealer and he stated the sensor in need is a discontinued part.
The local boneyard has nothing of that vintage either. I am hoping that somebody has a wiring diagram that shows the color of the wire/wires for the sensor. I also did the key on, key off code check and came up with a 15, speed sensor. That is an $80 part at the parts store that might not be the total fix of the problem. I sure would like to know more about the temp sensor if possible first. Thanks for the info.