2003 Dodge Caravan Transmission or Computer

Thank you so much for replying to my question! I did what you said and it read P1684. I appreciate this so very, very much. Since being laid off, I just replace the PCM on the Van and purchased it from a site online called Auto Computer Exchange and they said they would program it and needed the VIN and mileage. So, I did so and when I received it and installed it, it started and drove well but it would not shift out of second gear and the engine light was on. The engine light was not on before the PCM went out. Even when the old one was in. When I get back on my feet and go back to work I will make a donation to all of you kind men who answere questions on this site. This is the only transportation I have to pick up and drop off my kids and this means the world to me. Thank again. God Bless!

Thanks for all of your help. I really appreciate it a lot. I changed the negitive battery cable today and the van is still in Limp mode. So, what the P1684 code is, may be because the battery and the PCM when replaced needs to be reprogramed. Or it may be like you said the coil pack or the speed input/output Sensor. I will let you know when I take it to the Dodge dealer. Also, after we changed the negitive battery cable the code P1491 came on. I looked it up online and it said that it had something to do with the coolant fan. Funny thing is, is the coolant fan come on and off like normal. All the trouble with the van being on limp mode and the check engine light being on happened after the PCM was replaced and programmed. It was not done by Dodge. It was done by a site online called Auto Computer Exchange. Could it be that even know I gave them my mileage and VIN number that they could of programmed the PCM incorrectly? Even with the bad PCM, the engine light did not come on. Well thanks a lot. My family and I appreciate it a lot. All your help means the world to us. Thanks again and God Bless you for all of your help. Danial Bartlett

Thank you Sir! I will do that and get back to you.

Hello Sir.

I checked the van's Vin number that I gave the Auto Computer Exchange when I ordered the Powertrain Control Moduale (PCM) and the VIN number was the same on the invoice and the number I gave them. So, I replaced the negitive battery cabel and the van has a new battery too. Still the same problem. I took it to AAMCO and they did a free diognostic test and the code came up P0888 and when I looked up the code on the computer it read this (P0888 (2) Relay Output Always Off) I am not sure what this mean really. I took out the Power Relay like some one told me to do and put in back in about five minutes later and still the same thing, in Limp Mode. I don't know what is wrong. So, I called the Dodge Dealership and asked the Auto Tech what that meant and he said I would have to bring it in and he would run another diognostic test on it. I told him with me being laid off of work and not being able to pay my bills as it is, that I can't afford to pay another $ 85.00 dollars to have it checked again. I told him that the engine light did not come on when I had the bad PCM in the van. Also, when I got the van back from the Dodge Dealer the first time a relay was out and so was a square side wire, with one side gone. Wire shapped in a c shap. So, they are going to test it for free on Monday. Also, I sent back the very first PCM Core back to the Auto Computer Exchange and told them what is wrong now with the van and they are going to send me another PCM. I will send the one they sent me the first time, if this one works.

But, would you have any idea what the Code P0888 Relay Output Always Off means? I am so frustrated and feel like I am doomed and don't know what to do and how I am going to get my kids back and fourth to there mother's house and school.

I would appreciate any help you can give me. Thank you so much and God Bless.

Danial Bartlett

Thank you so much for all of your help. I am taking the van in on Monday to the Dodge Dealer for a second diognostic test on it. They are not going to charge me for it since when I had the last one done that one of the relays were out of the fuse box and a wire (maybe a ground? I am not sure) was disconnected from the fuse box. Also, they told me if it is just a programming problem they will program it for me. Sorry for bothering you with all of this. But, when Dodge does do this next diognostic test will they be able to say what is wrong with the van for sure at that point or will they tell me the same thing that you have told me? Also, if one of the relays circuits in the TCM are open or there is a short to groung, how hard it that to repair? Last thing can you give me any idea on where the TCM is located ane where the Transmission is located in the 2003 Dodge Caravan. Thank you so much for all of your help and time.

Hello.

Sorry for bothering you again, but I just took the van into the dealership to have another diognostic test done on the van and it came back the code for the radiator fan not comming on. So, they replace the fuse for that. It also came back P0888 which mean that the relay output always off. So, they told me that there technition did not know what that meant and that I would have to pay another $ 85.00 dollars to have there transmission technition do a diognostic test on the van.

Before I do that I am going to change the input and output speed sensors on the van and see if that will solve the problem. Can you let me know what you think? Also, shouldn't of the technition that performed the diognostic test today have been able to find out what the problem was? Without sending me to this other technition? Thanks for all of your help and I really appreciate it.

Danial Bartlett

I changed the input & output sensor and nothing happened at all. The van is still in limp mode and check engine light is still on the dashboard? Not sure what to try at this point. But, I am not giving up. Any more sugestions? This is driving me crazy.

Thank for your help!

Danial Bartlett

Would you have an idea where the TCM power relay sense circute is located on the 2003 Dodge Caravan? Thank you sir

I will check the fuse and the things you said on the Transmission on Tuesday and get back to you.

I just have one more question is the output speed sensor on the right hand side of the engine (drivers side) below the fuse box and the battery? The input speed sensor about a foot or so away from the output sensor to the left? I just unplugged them and then unscrewed them. Then screwed them in and plugged them in. Could I have scrwed them up while installing them? Sorry about bothering you. Thank you sir

I have one question for you. I spoke to my brother-inlaw and he said if the engine light did not come on and you did not have this problem with the code P0888 and the TCM before the PCM went down that since the van was not driven while the computer was being replace you could not of hurt anything in the van. He said he would have the PCM replace again, because the PCM may be working fine in all aspects of the van except the communication between the PCM and the TCM. Is this possable? I am having a new PCM sent out today, because it was under warranty. Thank you so much. Danial Bartlett

I will let you know. Thank you so much for all of your help. You are a life saver! Thanks again. Danial

Hello,

I received the new PCM from the company and installed it into the van. While I was doing so I disconnected the negitive battery terminal and there are three grounds. One large one for the battery, one a lot smaller that I am not sure what it is the ground for and a even smaller one that I am not sure what that one is a ground for either. The main battery ground cable connects to the frame on the left hand side with another of the small ground cables. The other ground wire is grounded by it self to the other side of the frame. Well we replaced the main battery ground cable, but we did not respace the other two ground cables. So, today I noticed while changing the new PCM that the other two grounds are coroded. Can this be the problem, why the van is stuck in limp mode and has the code P0888 Relay output always off? If so, I will just go and replace this part. My brother in-law told me that if there were no codes comming on when the PCM was bad or when it was not in the van or the check engine light was not on when the PCM was bad or out of the van then he felt it was the PCM. Nothing else was messed with on the van during that time, so nothing else could go wrong if it is not touched. That is why he felt it was the PCM. But seeing the other two grounds coroded, I am wondering if it is that? Thank you sir.