Question about 2003 Dodge Neon

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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?

Speedometer worked erratically. After replacing both input & output sensors, the speedometer quit working. Also, not shifting out of second gear.

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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

Posted on Aug 10, 2015

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Posted on Jan 02, 2017

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2 Answers

Why is the speedometer reading erratically?


Depending on the type an year vehicle an the electronics on the car , the instrument cluster could be at fault ! The stepper motor that moves the speedo could be the problem if a GM product ! As far as the speed sensor goes a few other things wouldn't work very well if it were bad an the check engine light would be on more then likely because this is an input to the PCM - engine computer ! The transmission would shift erratically !
Speedometer
The IPC displays the vehicle speed based on the vehicle speed signal from the PCM. The PCM converts the data from the vehicle speed sensor to a 4000 pulses/mile signal. The IPC uses the vehicle speed signal circuit from the PCM in order to calculate the vehicle speed. The speedometer defaults to 0 km/h (0 mph) if a malfunction in the vehicle speed signal circuit exists.
So I would say the instrument cluster is bad !

Jun 10, 2015 | Cars & Trucks

2 Answers

Speedometer behaves erratically (needles shoots down to 0) and forces transmission into limp in mode while driving.


the output speed sensor is going bad,or may have a broken wire on the connector.repair r the wire if so,or replace the sensor.Transmission goes into limp mode to protect it'self,and engine,from internal damage. repair this,and you should be good

Mar 31, 2015 | 2003 Dodge Neon

1 Answer

Won't shift out of 1st. I have already replaced the input and output speed sensors as well as the shift solenoid. Still wont shift out of 1st and speedometer still wont work but tack does.


your input output speed sensors check voltage at sensor check plug see if you have voted and ground and put more than likely there's no voltage or no gtound

If you need further help, reach me via phone at https://www.6ya.com/expert/james_9c1b039055413ffa

Mar 03, 2015 | 2002 Dodge Neon

1 Answer

Have replaced speed sensor and speedometer, but speedometer still does not work. Do you have any suggestions on what to try next?


There are usually TWO speed sensors on modern day vehicles, INPUT and OUTPUT. You may have changed one of these , but you may need to change the other. Ask your parts supplier, they will help you with the other. GOOD LUCK FRIEND.

Nov 08, 2014 | 2001 Nissan Maxima

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Speed sensor


Speedometer sensor measures axle(driveshaft) speed for your speedometer gauge.
Input speed sensor measures the speed of the input shaft of the transmission.
The output speed sensor measures the output shaft, the ECM compares these two signals to determine the amount of clutch slippage and adjusts parameters accordingly for optimal operation.

Feb 02, 2014 | 2002 Kia Sedona

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...


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.

Jul 21, 2009 | Dodge Caravan Cars & Trucks

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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