limp mode?

do not do what the guy said till it is checked out first. that was an expensive guess that i bet will not work.

the no reverse is what concerns me. go to a trans shop and have them check it. it sounds like you have an internal failure in the trans.

roy

Internal failure?! Hearing that concerns me even more. I changed the trans fluid and found no metal attached to the magnet inside the pan. I just have a gut feeling that it's an electrical issue because there were absolutely no signs at all that would lead me believe that it is a mechanical failure. It just happened overnight. P0882 code says low voltage to TCM. Why is it saying this when the TCM is integrated into the PCM?

yes, but no reverse is a hyraulic issue not electrical. thats why i suggested internal failure.

the limp mode may be electrical but will not solve the no reverse issue

Roy

Transmission problem
2003 Dodge Caravan 6 cyl Front Wheel Drive Automatic 165k miles

Hi. I have replaced the input and output sensors on my transmission. I have also changed the the transmission computer with a used one. I have checked connections for bad wires, all looks good. when I removed the battery cables overnight the transmission shifted fine for a half mile then back to it's limp mode. I'm wondering if you think it could be the pcm? I'm also wondering how do I test if is the pcm before I buy one. I have found a used one and I'm wondering if it has to be programed before I install it. I guess I'm wondering what will happen if i just plug the new pcm into the van? I have also read about a solenoid pack? I'm not convinced it's the solenoid pack since van shifted fine for a half mile. Any help would be great.

the only way to be sure about what is causing this is by using a good generic scan tool, and read the TCM codes from the manufacturers connector. It is seperate from the OBD connector. You will be able to read and check the inputs. ok?

i have a 2003 caravan with 125000 kms on it drove the van one day ran fine not a problem next morning started it got 10 feet out of driveway and engind light came on as i drove further sounded like it was revving high found out later it is in limp mode tranny only shifts into second code comes up Engine Speed Input Circuit dealer told me it was either input or output sensor on tranny changed both no difference i still have my speedometer do you know what might be causing this problem

Usually, with A604 transmission, changing both input and output sensor solves the problem. If it doesn't, then you need to check the transmission control module, before you replace it.

already changed both speed sensors as well as crank position sensor does the computer reset it self or does that still have to be done by dealer the code coming up is p0700 and p0725

P0700 Transmission Control System Malfunction
P0725 Engine Speed input Circuit Malfunction

You don't have to go back to the dealer. Autozone and CSK/O'Reilly can reset the computer for you. You can also unplug the negative battery terminal for more than 30 minutes to reset it yourself, but then you have to reset your clock and radio stations, and stuff, and the computer has to re-learn everything else. Based on the codes (P0700), I believe you have to replace your transmission control module. That was what I had to do with mine several years back...

Transmission problem
2003 Dodge Caravan 6 cyl Front Wheel Drive Automatic 165k miles

Ok I still have not gotten anywhere on this van. I have received these codes p01684 p0700 from turning my key on off on. I have also received p0755 from a scanner. I have replaced the input and output sensors I have also had the tcm reprogrammed and the pcm repaired and reprogrammed. My transmission is still stuck in limp mode. Pcm and Tcm were rebuilt from auto computer exchange.com. does anyone have any idea/suggestions. the transmission fluid is clean and does not smell burnt or have metal filings. I wanted to know if there is a way to test the solenoid pack before I bought a new one.

the P1684 just simply means that the battery was disconnected within the last 50 starts. that will go away on its own and is nothing to worry about if you did indeed disconnect the battery.

have you done so? and why? problems occur before doing that?

p0755 is solenoid b pack issue. first i would make sure the solenoid pack is clean and the connectors going into it are tight and secure. also clean up the inside terminals of the pack. make sure they are not moving around to do this poke them with a small screwdriver it should move very little.

p0700 is a tcm issue but seems like you already replaced that and that code can be thrown by the p0755 so well concentrate on that one for now.

I have replaced the battery. I was told to by the tcm/ pcm rebuilder to do so when I reinstalled the parts. Today I read a article about making new ground paths. I ran a 10 gauge wire from the negative to the alternator bracket. I also ran one from the negative to the tcm. I still have the same results ( limp mode). I did notice the conncection to the shift solenoid was a little dirty / oily. My money is limited so I was wondering if their isn't any loose wires going to the solenoid pack would you think it's the solenoid pack, also would you buy after market or from dealer?

id be cheap and get one from a junk yard and see how that went. if that fixed it then get a new one. if not tehn it may not be the solenoid

they bout 200 bucks for the part. and they can really mess up your transmission if left bad. resulting in total rebuild

My caravan developed the following problem this past weekend, transmission would shift to 2nd and would not shift any further. I took vehicle to repair shop and they found the following error codes, 0700, 0733, 0734 and 1790. The repair shop recomended that I replace transmission to the tune of about $3,000 at the moment with times as hard as they are, I cannot afford it. I have been on you site and have noticed various posts on dodge transmissions and one recurrent solution is to replace the solenoid pack. Is this a job that I can do, I have worked on my own cars before, changing water pumps and other various items. Where is this solenoid pack located and is it an easy replacement? Thanks!

Hello, Yes you should be able to handle replacing the solenoid pack, the pic below is of a 97 but should be in same place. Also there are other possibilities... The P0700 - is indicationing the TCM (Transmission Control Module) which is the Computer for the tranny. The other 2 codes indicate the 3rd and 4th shift solenoids which could be the solenoid pack. And the last code could be do to the TCM. However, trying to diagnose the exact cause is a pain and to just start replacing electrical parts can cost you plus you cannot return them. I would recommend taking it to a Transmission Shop for proper diagnosis.

.

I am following up about a transmission issue that I had posted earlier. My grand caravan slips into limp mode periodically. So far I have had the ecm and the tcm flashed and reprogrammed. The solenoid was replace 11 months ago. I have replaced the relay for the eatx. I have checked and verified the grounds for the transmission. The codes I pulled when this all started were p0700 p1776. I also need to replace the sensor for the ABS. The can will go from 1 day to 4 days will out dropping into limp mode. It does seen to happen at the same point of a commute, when the van needs to down shift a lot going up a hill. I am just looking to see if you may have some insight/familiarity with this.

it sounds like an intermittent problem so check your connections at trans and try putting some dielectric compound on connectors on trans especially if you see corrosion . try to clean off corrosion as well. carefully inspect harness to see if there are any bare spots on wires that may touch the body/engine/trans. check connections at tcm as well.

I have a 2003 dodge grand caravan with a 3.3, I am stuck in limp mode, only codes I get are p0700 and p1684, I have replaced both output and input speed sensors, I have tested wires I am weighing on it being either a bad TCM or the solenoid pack, I however believe that I am of fault as to why it went into limp mode, I was at a red light, I needed to get over a lane, so me being an complete **** I applied the break and gas pedal to anticipate the change in the light switching to green, when I let go of the brake, I noticed the limp mode, any aspect as to what I may or may not have done to cause this will be greatly appreciated

the 0700 is the etax controller which could have been set by the p1684 see pics for diagnosis on thing s to check otherwise let a pro handle it.

I've checked the pins 56 and 57, I have positive connection at 56, and grounded connection at 57, when the car is running, it seems as though I have a ground connection at 15, I've read that that was suppose 12v positive don't know if that's an issue or normal.

I don't know what you are checking but all the pins you say are checking are wrong on pcm and there are only 57 on tcm . your best bet is to have apro look at this

Maybe you misunderstood, the pins I checked where on the Tcm not PCM and there are in fact 60 pins, 56 is fused b+, 57 is ground and both checkout iv added the diagram of TCM harness

15 goes to trans control relay which if key on would be activated so would not read positive 56 goes to fuse B+ #F15 I n integrated power module which may be your problem and 57 goes to ground. Have a pro scan it because auto parts scanners can't pick up module problems other than pcm and tcm.

OK so here's an update, I've changed the tcm , when I was finished I started the van and no light came on, I went for a test drive and as soon as it was suppose to shift, the light came on. This time I got p0755 along with the other two codes, I changed the shift solenoid which was associated with p0755 and no luck, I started checking for wires and found that on pin 19 of the tcm , it is the shift solenoid 2-4 wire, I have no power at TCM but I have it on the solenoid harness. Any thought. And thanks for your help I really appreciate it, I've been to aamco and a couple of other shops, they all say the same thing and wanna hand me a big bill, believe I personally would love to just get it fixed but unfortunately that option is not available to me, thanks for bearing with me

did yo have a pro install the tcm and put the necessary things into it from a scanner? they are vin specific. Did you check the trans relay like I mentioned in last reply? I'm not sure I can help any further as this stuff should be physically looked at not by computer

I got the TCM Used, I did check the relay and fuse #15 20a, they are both ok, the wire at pin 19 on the TCM harness is for: 2-4 shift solenoid, that wire has low amps coming out of the TCM but it has good amps on the solenoid harness, could there be a break in between? does that wire go from tcm to the IPM first and then to solenoid? again thank you for the input.

if you perform these tests and end up with same thing then it's either the tcm or the trans has an internal problem I can help you no further without actually testing it. My opinion is to take to a trans guy because I suspect that is the problem all along.

OK I have a multimeter, with the dial on 200 0hms, I tried testing pin 19 at the TCM(which is 2-4 solenoid control) and pin 8(2-4 solenoid control) at the solenoid wiring harness and didn't get any reading, am I checking the right wires? Am I on the right setting for the multimeter? Or am I right and that wire is broke? Again thank you so much I feel that I'm inches away????

if the wire is broken then check from tcm to trans wire. if it's more than 5 ohms there is a problem with it. I am unable to help you any further. any more questions will not be answered.

Hey, Just thought I should update this: I did find and repair the problem, the 2-4 solenoid wire (#8 on the solenoid pack)(#19 on TCM) was corroded at about the center of the harness, I replaced with a 14 gauge wire by cutting approx 1 inch of the corroded area. The van is now shifting fine and no codes are followed, will update in a couple days if any problems occur, just wanted to say thanks for the help!!!

Also screw a multimeter, a test light gave me the fix, the multimeter wouldn't even get a reading.

I believe the problem is related to the etax circuit. Possible wiring issue as with a test light and a multi-meter. I have done a small amount of diagnosing in the fuse panel under the hood. Did some testing on the etax relay circuit. I have desperately been trying to find a wiring diagram for this circuit in order to trace the wiring and identify which wires are what. I am a pretty knowledgeable mechanic I just do not have the time to take it to the shop and I do not have one of those scanners that will tell me what exactly is going on transmission wise on the other hand I do realize the issue could be related to the solenoid pack itself internally, but I figure if I could trace it down without taking something apart first that may be a little easier. I just cannot seem to find it wiring diagram for the etax circuit.

Hey Cazz,

Here is the complete wiring diagram for the engine and transmission including the ASD relay you have requested. Can I ask what the car is doing?

Please let me know what happens.

Best, Ken

Stuck in limp mode. Does not shift into third. I have found that from 2001 and up this has been a consistent issue dir these vans. On the Etax relay circuit the side that is meant to receive constant twelve volts one side has twelve volts and the terminal above that one reads less then twelve. This was done with a jump. I apologize. I do not have the relay in front of me to tell you what the pin numbers are. I am at the moment assuming a harness or wiring problem. Maybe corrosion. Thank you so much for the information I will post once I have more information.

Does the computer have any codes? If so let me know what they are and clear them, take the car for a drive to see if the transmission shifts okay. Even if just one time.

Best, Ken

Van was driving like brakes were on, right front brakes started smoking.Stopped, backed up, pulled forward an few times, seemed to loosen up. Went by a Firestone store as were we desperate and 40 miles from home. they said brakes were turning, but both front calipers were hot. . They wanted $1000 to fix didn't say what caused the problem.Did nothing drove home. Next day went to drive after about 15 min, trans went to limp mode. Started for home and them remembered to restart it and it cleared the limp mode and drove ok home. Haven't driven it since. can the front brake problem cause the limp mode?Check engine light is on, no ABS light. Front brake were rebuilt about a year go with new rotors and pads.

Have the computer codes read and post them here for more assistance. These codes could led us in the proper direction for diagnosing this vehicle.

Does the ABS pump seem to run for long periods of time? If so, when?