Question about Dodge Caravan

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Vehicle had a rough automatic transmission shift and erratic speedometer when vehicle warmed up. I've replaced both output and input speed sensors. Now the speedometer does not work and transmission won't shift from low.

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  • yadayada
    yadayada May 11, 2010

    the trans iis shot

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Still sounds like a bad output speed sensor - check scan the TCM for codes and see what you get. Also check the wiring at and near the output speed sensor connector.

Posted on Jul 22, 2009

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Replaced input and output speed sensors for erratic speedometer. Now the speedometer remains at 0. Anyone have a suggestion on what else could be wrong?


input and out put speed sensors tell the TCM and the ECM the difference between engine rpms and transmission input roms so that the correct gear ratio can be selected
A speedo sensor reads the out put shaft (drive line ) shaft and refers to road speed for speed and odometer readings and to calculate the fuel consumption rate
it is possible that you have replaced the wrong sensor
Talk with an accredited transmission specialist shop and have the problem diagnosed

Aug 10, 2015 | 2003 Dodge Neon

Tip

Speedometer problems? Try this money-saving tip!


With today's cars and trucks, your speedometer's reference doesn't come from a spinning cable connected to the transmission anymore. It comes from a pair of wires coming from a sensor connected to the transmission. This is your vehicle's speed sensor.

In some applications, there are 2 of them, but we'll concentrate for now on the transmission's output shaft speed sensor. This is the one that is cruicial in telling you how fast you're going down the road, courtesy of your vehicle's computer reading its signal and then translating that information to your speedometer. The computer also uses this signal in order to help determine fuel delivery, ignition advance, transmission shift points, etc., based on the vehicle's speed.

That being said, it's an important little sensor! And might I also say that it is fairly easy to change and is fairly inexpensive. But let's look at your speedometer. Are you getting erratic (jumpy) readings on it? Is it just stuck at 0? Is it wildly inaccurate? Is your computer-controlled transmission shifting erratically as well? Chances are, if you have one or more of these problems, you may want to first look at replacing your output shaft speed sensor. If your vehicle has 2 (input and output shaft sensors,) replace them both. They're inexpensive and chances are, if one is bad, the other has aged the same way, so it will be beneficial for you to change them as a pair.

How inexpensive are these do you ask? Well, at most auto parts stores, you'll be looking at spending no more than around $15-$20 each, Depending on the year, make and model of your vehicle of course. Also depending on your vehicle will be the amount of time for replacing it (them.) I recently replaced both sensors on a '98 Dodge Caravan and it took me around 15 minutes or so, and I wasn't in a huge hurry to finish, either. Again, depending on your vehicle, the location of your speed sensor(s) will vary. The Dodge Caravan's were located on the driver's side, way at the front of the transmission, allowing very easy access.

So, if you have any of the above-mentioned problems and care to tackle the problem on your own, do so before going out and buying a new instrument cluster. (Yes, I've seen many problems on here where the automotive technician was quick to replace the cluster, costing the customer hundreds of dollars, and ending up with the same problem!)

I wish you safe driving in the coming seasons and most of all, I wish you good driveability!

Kind Regards,
Jason_MKG

on Mar 09, 2010 | Plymouth Voyager Cars & Trucks

Tip

Speedometer problems? Try this money-saving tip first!


With today's cars and trucks, your speedometer's reference doesn't come from a spinning cable connected to the transmission anymore. It comes from a pair of wires coming from a sensor connected to the transmission. This is your vehicle's speed sensor.

In some applications, there are 2 of them, but we'll concentrate for now on the transmission's output shaft speed sensor. This is the one that is cruicial in telling you how fast you're going down the road, courtesy of your vehicle's computer reading its signal and then translating that information to your speedometer. The computer also uses this signal in order to help determine fuel delivery, ignition advance, transmission shift points, etc., based on the vehicle's speed.

That being said, it's an important little sensor! And might I also say that it is fairly easy to change and is fairly inexpensive. But let's look at your speedometer. Are you getting erratic (jumpy) readings on it? Is it just stuck at 0? Is it wildly inaccurate? Is your computer-controlled transmission shifting erratically as well? Chances are, if you have one or more of these problems, you may want to first look at replacing your output shaft speed sensor. If your vehicle has 2 (input and output shaft sensors,) replace them both. They're inexpensive and chances are, if one is bad, the other has aged the same way, so it will be beneficial for you to change them as a pair.

How inexpensive are these do you ask? Well, at most auto parts stores, you'll be looking at spending no more than around $15-$20 each, Depending on the year, make and model of your vehicle of course. Also depending on your vehicle will be the amount of time for replacing it (them.) I recently replaced both sensors on a '98 Dodge Caravan and it took me around 15 minutes or so, and I wasn't in a huge hurry to finish, either. Again, depending on your vehicle, the location of your speed sensor(s) will vary. The Dodge Caravan's were located on the driver's side, way at the front of the transmission, allowing very easy access.

So, if you have any of the above-mentioned problems and care to tackle the problem on your own, do so before going out and buying a new instrument cluster. (Yes, I've seen many problems on here where the automotive technician was quick to replace the cluster, costing the customer hundreds of dollars, and ending up with the same problem!)

I wish you safe driving in the coming seasons and most of all, I wish you good driveability!

Kind Regards,
Jason_MKG

on Mar 09, 2010 | Dodge Caravan Cars & Trucks

2 Answers

CANT FIND WHERE THE SPEED SENSOR IS NO MY 1995 OLDSMOBILE AURORA


hi , their is two different speed sensors on your vehicle one is the input speed sensor which is inside the transmission and the transmission will have to be removed to replace it the other one s the output speed sensor is located directly above the passenger side trans-axle shaft. your input sensor is the sensor which tells the transmission when to shift and the output speed sensor tells the speedometer what it should display and both those parts are fairly cheap they are around 15-25 dollars but just remember if your input speed sensor is bad it is gonna cost you a minimum of 1000 dollars to have a mechanic fix as the transmission needs to be removed hope this is what you needed

Jun 06, 2010 | 1995 Oldsmobile Aurora

1 Answer

The SERVICE BRAKE SYSTEM light comes on when driving and stays on


i had a customer with a 2004 gmc sierra 2500hd 2wd that stated that the srevice brake system light came on while driving. the transmission would shift hard and erratic plus the speedometer was erratic. the check engine light came on with two codes p0502 and p0503(vehicle speed sensor A low input and vehicle speed sensor A intermittent/erratic. i replaced both vehicle speed sensors mounted on the driver's side of the transmission. both of the speed sensors were the same. test drove the truck after and all issue were solved.

Feb 22, 2010 | 2003 GMC Yukon Denali

1 Answer

Vehicle had a rough automatic transmission shift and erratic speedometer when vehicle warmed up. I've replaced both output and input speed sensors. Now the speedometer does not work and transmission won't...


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

Jul 30, 2009 | 2002 Dodge Caravan

1 Answer

I have a 2002 kia sedona and occacionly the car jumps while i am driving and then runs very rough...I have learned that when i shut the car off and turn it back on it seems to run normal again


Sounds like either an input or an output shaft speed sensor. In a nut shell, the transmission's shifting is controlled electronically; at a stop or very slow speed, the transmission is automatically in first gear...when these sensors 'sense' that the vehicle is travelling at a certain speed, it tells the transmission to shift into second. At the next specified speed, it shifts into third; etc. etc. What it sounds like is that one of these sensors is going bad, telling the transmission to downshift, but the other sensor is fighting that command and causing the vehicle to 'act' like it's running rough, when in reality it's probably just the transmission rapidly jumping between gears. These sensors aren't particularly cheap, but are pretty easy to replace. Start by finding a shop that will plug in a code reader for you (or do it yourself if you have one). You're looking for a code in the range of 0715 to 0723. If it reads 0715 to 0718, that's the input side. 0720 to 0723 is the output side. Good luck.

Jul 05, 2009 | 2002 Kia Sedona

1 Answer

Duag code u1262, p0500 & p0720


Your codes are as follows:

U1262 communications bus fault
P0500 Vehicle Speed Sensor Malfunction
P0720 Output Speed Sensor Circuit Malfunction

What, if any, symptoms is your vehicle showing?

If your Vehicle Spped Sensor has gone bad, it can cause loss of anti-lock brakes, "anti-lock" or "brake" warning lamps on the dash, the speedometer or odometer may not work properly (or at all), your vehicle's RPM limiter may be decreased or automatic transmission shifting to be erratic.

Jan 19, 2009 | 2001 Ford Super Duty F 450

1 Answer

1991 Chrysler Imperial Problem


Your car has the A 604 transmission also called the 41TE,and it uses an input and output speed sensor mounted on the transmission.These speed sensors feed information to the Transmission Control Module (TCM) one of the vehicle's computers, which calculates vehicle speed,and sends a speed signal to the speedometer in the dash.It is a totally electric speedometer and odometer,no cable drive like old cars.So the first step would be to scan the vehicle's computers for diagnostic trouble codes,as a malfunctioning speed sensor can cause your symptoms,sometimes accompanied by no upshifting,or erratic shifting.All the components involved in the system have to be deemed good,or repaired if a component is found defective.With the scan tool,there is also a data stream available for viewing the systems while the engine is running and the car driving,to look for malfunctions.Within the data stream,i can look at the speed sensors individual outputs,and see what the computer is seeing as far as inputs and outputs.If the speed sensors check out ok,and are functioning properly,then the problem would likely be the instrument cluster,including the speedometer in the dash.But other components have to be verified good before drawing conclusions.

Aug 31, 2008 | 1993 Chrysler Imperial

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