2001 dodge caravan 3.3 speedometer not working - Hot Rod Forum : Hotrodders Bulletin Board
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Old 07-09-2009, 07:23 PM
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2001 dodge caravan 3.3 speedometer not working

It worked great until I replaced the motor, everything else works just great ,even the odometer. I put in a new computer checked all connections and there is nothing. Could I have screwed up the sensor somehow? I didn't mess with that part, dropped the engine and tranny at the same time, swaped them out and reinstalled. It went in to easy I guess. I don't know where else to look! HELP ME PLEASE! I'm ready to get this back to it's owner but he won't take it until I fix the speedometer or he will get tickets he says! What do I need to do other thatn try a new speed sensor?

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Old 07-09-2009, 08:38 PM
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I am in a Chrysler class tomorrow I will see if there is anything they can help with. We are talking about CAN buss so this will be a little easier to think about
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Old 07-09-2009, 10:43 PM
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I fixed it ,but I want to see what you can come up with. lets see what their teaching you.
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Old 07-10-2009, 02:55 PM
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My first guess was an issue with the BCM. When these were around more I powered down then repowered the BCM (unpluged it and reset it) and it took care of most issues with the instrument cluster as well as the wipers and window motors. Ted the Chrysler instructor (he is one of the few that Chrysler still has worknig for them) thought along the same lines. The BCM takes an output speed signal then turns that into ground speed and that is converted into miles driven. What was it?
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Old 07-10-2009, 03:04 PM
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YOu got it! I did the same thing after I sit and pondered about it for a while. Cleaned the connections and put in a little electrical grease and she was fine.
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Old 07-10-2009, 03:10 PM
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Cool great minds think alike, Mike
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Old 09-26-2010, 01:25 PM
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I have the same problem but i cant figure out how to reset the BCM..

How did you reseolve the problem exactly! I could really use the right answer ..
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Old 09-26-2010, 02:58 PM
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Try takeing the cables off the batt over night first. If that doesn't. Work than the bcm is the box right around the batt box, unplug it ( disconnect batt) clean the connections and add some die electric grease. Let me know if this helps
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Old 09-26-2010, 03:21 PM
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wow thnks for the quick reply! I was under the impression that the white box under the dash behind the emergency brake was the BCM. Then in the engine is the Battery, Fuse Box, PCM (right behind the headlight) and then the Transmission module by the left front tire. Which one did I label incorrectly? I have been driving myself crazy with this problem for the last 2 days tracing every wire, changing harnesses! When I saw your post online I couldnt believe it! thanks again!
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Old 09-26-2010, 04:14 PM
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No you are correct, it has been a while since I done this job. I cleaned the tranny module and it worked for me. To be safe clean them all. Make sure you use die electric grease! Had a friend I told to use grease on a harness and he used wheel bearing grease ( he was not that brite anyway). But I had the same problem for two days untill I. Cleaned the connection with electrical cleaner and a small brush. Plugged it back in and it worked like a charm. That van was a job from h*** and that was just one of the minor problems it had.
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Old 09-26-2010, 04:15 PM
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Chrysler had an issue with these that they didn't ever figure out. Kind of like the computer guy telling you to reboot your computer. They see a voltage spike or low voltage and they don't want to play nice with everyone else. I have unplugged and replugged them in and like FM (freekin magic) they worked. Can't tell you what I did but that and it has always worked for me.

Wait till you have an ABS issue on the same van and a 20.00 switch goes out but you have to buy the entire unit to get it.

Mike
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Old 09-26-2010, 04:29 PM
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What can you expect from a PCM mounted under the battery tray. Silly engineers, they don't think things will ever break. And they only get worse from there.
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