How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask David Gieswein Your Own Question
David Gieswein
David Gieswein,
Category: Dodge
Satisfied Customers: 100
Experience:  Automotive technician at Doug Gray Dodge/Chrysler/Jeep
94072907
Type Your Dodge Question Here...
David Gieswein is online now
A new question is answered every 9 seconds

What would cause my 2003 dodge caravan sport van to go into

Customer Question

What would cause my 2003 dodge caravan sport van to go into limp mode and speedometer not to work?
Submitted: 10 months ago.
Category: Dodge
Customer: replied 10 months ago.
I've already changed the input and output sensors
Expert:  Chad Farhat replied 10 months ago.

Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question and I will be posting your reply ASAP.

Customer: replied 10 months ago.
Ty
Expert:  Chad Farhat replied 10 months ago.

most common cause

1- VSS ( vehicle speed sensor

2- output & input shaft sensors on the transmission

3- defective instrument cluster

if you get is scanned with a Chrysler scanner or equivalent it will narrow down to what is failing ?

Please let me know

Thank You

Chad Farhat

ASE Certified Technician

Expert:  Chad Farhat replied 10 months ago.

so these been replaced ?

how about the transmission module ,have you inspected ?

Expert:  Chad Farhat replied 10 months ago.

This Bulletin Applies To Vehicles Equipped With 41TE, 42RLE or 45RFE Transmissions. DISCUSSION: When servicing an automatic transmission on any of the vehicles listed above, Diagnostic Trouble Codes (DTC's) displayed relating to transmission solenoids, may be misleading. The following DTC's: P0755, P0750, P0760, P0765, P0770, P2706, could be displayed indicating solenoid faults when the Powertrain Control Module (PCM) is actually at fault. If any of these DTC's are encountered, Check the Powertrain Control Module manufacture date. The date is shown in the Module Serial Number on the label attached to the front of the module. The serial number is ***** 14 digit alpha numeric code which is located on the bottom of the part label. A sample of the number is ***** below: MODULE S/N T65EH2333D55N6

Customer: replied 10 months ago.
The codes that are coming up are p0700 p0500 and p0731 or possibly p0721
Customer: replied 10 months ago.
with those codes what can it be
Customer: replied 10 months ago.
I also changed the tcm
Customer: replied 10 months ago.
Are you still there
Expert:  Chad Farhat replied 10 months ago.

was it new or used .

it is a common problem

ALLCOMPUTERRESOURCES.COM IS GGOD WEBSITE TO USE

Expert:  Chad Farhat replied 10 months ago.

i m sorry this not texting, there is a delay between replies

Expert:  Chad Farhat replied 10 months ago.

we send them out to this company & get them to rebuild and it will be plug & play no programming needed , you supply them with your vin# & mileage .

Customer: replied 10 months ago.
New so what can I do now about the speedometer and it being in limp mode
Customer: replied 10 months ago.
What gets sent out
Customer: replied 10 months ago.
what are you suggesting I do and is it expensive
Customer: replied 10 months ago.
Are you there still
Customer: replied 10 months ago.
Hello
Expert:  Chad Farhat replied 10 months ago.

i will open your question for another expert , sorry i m not fast enough for you

Customer: replied 10 months ago.
after chatting with you I'm still at square one
Expert:  David Gieswein replied 10 months ago.

Hello my name is ***** ***** I can help you. Please reply if you still need help on the issue. I am familiar with this problem

Customer: replied 10 months ago.
I do need help
Expert:  David Gieswein replied 10 months ago.

Good, I believe I have seen this problem before. Give me a few minutes to verify from the codes you gave

Customer: replied 10 months ago.
K ty
Expert:  David Gieswein replied 10 months ago.

Does your speedometer work?

Expert:  David Gieswein replied 10 months ago.

ABS light on?

Customer: replied 10 months ago.
Speedometer don't work and vans in limp mode and no lights on
Expert:  David Gieswein replied 10 months ago.

Can you do a bulb check at this time? See if the ABS light comes on when you turn the key on and then it goes out?

Customer: replied 10 months ago.
There are no abs lights on at all
Expert:  David Gieswein replied 10 months ago.

Even when you turn the key on and everything lights up?

Customer: replied 10 months ago.
All the lights come on when I turn the key on
Expert:  David Gieswein replied 10 months ago.

Even the ABS light? It must illuminate and then go out

Customer: replied 10 months ago.
It goes out
Expert:  David Gieswein replied 10 months ago.

Ok, that's good.

Customer: replied 10 months ago.
What can it be
Expert:  David Gieswein replied 10 months ago.

If you start your vehicle and these codes are still present, you should have a ABS light on.

Expert:  David Gieswein replied 10 months ago.

This is how it works. The ABS gets information from the wheel speed sensors and communicates that information to the Transmission control module. If the ABS module does not communicate that information then the TCM does not know how fast you are going in order to shift properly. Does this make sense?

Customer: replied 10 months ago.
Abs light comes on when I turn the key then goes out like it should
Expert:  David Gieswein replied 10 months ago.

It goes off when you start it up?

Customer: replied 10 months ago.
if I disconnect my abs my speedometer will work and my van will come out of limp mode is that what you are saying
Expert:  David Gieswein replied 10 months ago.

No, it is critical that your ABS system is working properly or your transmission will go into limp in mode

Expert:  David Gieswein replied 10 months ago.

From what it sounds like, I really think you have either a failing ABS module or more than one wheel speed sensors going out

Customer: replied 10 months ago.
My van is in limp mode now. So if I fix my abs will my van come out of limp mode and speedometer will work again
Expert:  David Gieswein replied 10 months ago.

Yes, but you have to clear the codes first either with a battery disconnect or a scan tool. This will probably work right now if your ABS light is off.

Expert:  David Gieswein replied 10 months ago.

It really sounds like the problem is intermittent.

Customer: replied 10 months ago.
if I pull the fuse/relay or unplug the module it self my van will come out of limp mode and speedometer will work
Expert:  David Gieswein replied 10 months ago.

No, if you disable the ABS, your transmission will stay in limp in mode. Try and disconnect both battery cables and touch them together for a few seconds to clear the memory. Then hook both of them back up to the battery. You should be able to drive normally again until the ABS screws up again

Customer: replied 10 months ago.
K I'll try that and I'll let you tomorrow if that works k ty
Expert:  David Gieswein replied 10 months ago.

Your welcome. Can you please tell me how you got the codes?

Customer: replied 10 months ago.
A mechanic did it with a hand computer
Expert:  David Gieswein replied 10 months ago.

If you can clear the memory like we talked about and drive it again and it acts up, try to get the codes again. You can go to autozone or Oreillys and they will read it for free. However you retrieve them, I really would like to see which ones come back.

Expert:  David Gieswein replied 10 months ago.

Thanks for your patience and time. You can rate me now and I will keep helping you or if you don't feel like I have answered your question yet you can wait till tomorrow.

Customer: replied 10 months ago.
I will let you know tomorrow how I made out k thnxs again
Expert:  David Gieswein replied 10 months ago.

That's fine, glad to help and good luck.

Customer: replied 10 months ago.
Hey David I tried what you told me to do and my van is still in limp mode and my speedometer still doesn't work
Expert:  David Gieswein replied 10 months ago.

Ok, sometimes it works sometimes it don't. The next step would be to try to use a scan tool to delete the codes and then drive the vehicle. If that still doesn't work, it is very possible you have an ABS module failure. You would have to find a way to communicate via scan tool with the ABS module to find out what specific codes it has.

Expert:  David Gieswein replied 10 months ago.

It is also possible, but not likely, that your fuses to the ABS module could be blown. I highly doubt it though.

Customer: replied 10 months ago.
The codes I have are p0700 p500 p0731
Expert:  David Gieswein replied 10 months ago.

P0700 is a generic code that just says you have a trouble code in the TCM

P0500 is for the vehicle speed sensor

P0731 is a code for gear ratio error in 1st gear.

The reason why your speedometer is not working is because of the P0500.

The reason why you transmission is not working is because of the P0500.

You must fix the P0500 code first. In order to that you must scan the ABS module to find out what codes it has.

Customer: replied 10 months ago.
How do I scan the abs module
Expert:  David Gieswein replied 10 months ago.

With a scan tool

Customer: replied 10 months ago.
Where can I get that
Expert:  David Gieswein replied 10 months ago.

You can go to Oreileys or Autozone and ask for a scan tool capable of reading ABS codes. Do not let them sell you a regular can tool. It has to be able to comm with the ABS module and find the ABS specific codes

Customer: replied 10 months ago.
K ty