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1998 Dodge Caravan speedometer

Tiny
REDBONE
  • MEMBER
  • 1998 DODGE CARAVAN
  • 3.8L
  • V6
  • FWD
  • AUTOMATIC
  • 171,000 MILES
After starting the van and sitting still my speedometer shows 30 mph and also the van wont engage into reverse until I put it in drive then back to reverse
Tuesday, September 8th, 2015 AT 2:34 PM

8 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,640 POSTS
When it reads 30 and you are sitting still, if you press the gas, does the speedo increase?
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Tuesday, September 8th, 2015 AT 6:40 PM
Tiny
REDBONE
  • MEMBER
  • 97 POSTS
No it doesn't but after 3to 4 mins then the speedometer goes to 0
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Wednesday, September 9th, 2015 AT 1:36 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,640 POSTS
Okay, that tells me one thing. Is the check engine light on? When the Speedo is at 30, can you drive it? If so, does it shift normally?
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Wednesday, September 9th, 2015 AT 6:13 PM
Tiny
REDBONE
  • MEMBER
  • 97 POSTS
Sometimes the check engine light comes on. Cant drive it at first.I put it in drive then reverse then it will move. Once I get it to move it does shift correctly with no problem
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Wednesday, September 9th, 2015 AT 6:41 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,640 POSTS
Are you sure the trans fluid is clean and full? Also, you really need to have the computer scanned to determine what trouble codes are stored. That may point us directly to the problem.
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Wednesday, September 9th, 2015 AT 6:58 PM
Tiny
REDBONE
  • MEMBER
  • 97 POSTS
I will have all that done tomorrow and tell you the results. Could it be the TCM OR MY TRANNY NEEDS REBUILT
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Wednesday, September 9th, 2015 AT 7:15 PM
Tiny
REDBONE
  • MEMBER
  • 97 POSTS
I checked the tranny fluid and it is clean and full.I also had the codes checked and the codes came back. Po715. Po720. Po700
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Thursday, September 10th, 2015 AT 1:45 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,640 POSTS
The P0700 is a general code that indicates there is a problem within the trans control module. The 715 indicates a bad input speed sensor and the 720 is the output speed sensor. Since the speedo is at 30mph, I would suggest checking the output sensor and wiring to see if that is where the problem is coming from. Keep in mind, it could be the TCM itself.
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Monday, September 14th, 2015 AT 6:17 PM

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