I have a 2003 sunfire the speed odometer keeps jumping and causes the transmission to **** and rev high would tat be an internal speed sensor and is this an easy fix

Transmission can suddenly 'grab' when it/you changes gear. An automatic transmission can be sluggish to change gear if the fluid is dirty and needs changing. A worn/slipping clutch on a manual transmission causes the engine to rev high before the car picks up speed.

From your description it sounds as though there's a misfire or rough running with the engine which causes the jerking, not the transmission unit.

There's many things that can cause the symptoms you describe - the MAF sensor .. fuel starvation .. O2 sensor ..

Get a good mobile mechanic to look at your car - or take it to a workshop. I don't think it's your transmission at fault.

could be the TPS
speed sensor faulty is
another typical fault .......code is PO 500
loss of anti-lock brakes the "anti-lock" or "brake" warning lamps on the dash may be lit the speedometer or odometer may not work properly (or at all) your vehicle's RPM limiter may be decreased the shifting of an automatic transmission may become erratic other symptoms may also be present

Read more at: https://www.obd-codes.com/p0500
Copyright OBD-Codes.com



https://www.obd-codes.com/p0500

Forum VE Holden Commodore 2006 2013

Bad Sleeves - Ford Servo Bore Transmission Fix Solution

www.fordservoboretransmissionfixsolution.com/blog/bad-sleeves

Original owner let it run low on fluid because of leak. ... The worn bores will cause slipping, hard shifts, and high revs between shifts from those gears. ..... Andy I bought a 02 mercury mountaineer v6 4.0 the the O/D flashes and service light is on ... Get on a flat surface at highway speeds and manually turn the OD of and on.

"O/D off" light blinking on dash? please help anyone? - Discussion ...

www.topix.com > Ford Explorer

Aug 24, 2009 - i have a problem with my 2002 ford explorer sport trac OD blinking... it will turn of if i .... That wire led down to the transmission speed sensor. ... the O/D off light started flashing and its revving really high before it will change ... 2004 Jeep liberty problems
Dec 9, 2011
Ford Explorer O/D Light, Slipping Transmission
Nov 20, 2011
2003 Ford Escape Rough Idle/Engine light blinking
Apr 20, 2011
FLASHING O/D OFF LIGHT 1995 EXPLORER V6 EDDIE BAUER
Dec 3, 2009
More results from www.topix.com

I am no Honda expert, but a similar problem happened to my ex sister in-laws Ford Taurus. The speed odometer would jump around and it had trouble shifting (automatic transmission). After driving it I changed out the speed odometer sensor on the transmission and it's been fine ever since. I changed out the sensor because if the cars computer cannot tell how fast the car is traveling then fail safes in place go into effect and the computer will do it's best to keep the cars rpm's down based on the speed indicator and not let it shift or shift properly either. If it's getting false speeds then it will shut down the motor when the speed gets to high and allow it to run as the speeds fall (jumping speed odometer needle). It effects the transmission shift points also. It will either shift erratically or not shift out of say 2nd gear, so that the cars engine can't get damaged based on what signal the speed sensor is sending the computer.

The speedometer and odometer gets a signal from the speed sensor in the side of the transmission where the speedo cable once was.
The problem could be the speed sensor, or something in the wiring, or in the instrument cluster. Or it could be that the transmission is failing internally.

The speed sensor would be mounted on the side of the transmission where the speedo cable used to be.

This transmission has only seven sensors and only one that is possible to cause this problem and that will be the vehicle speed sensor, 1 fluid temp sensor will not cause what you describe. 2.Input speed sensor will not cause this it monitor slipage 3.output speed sensor this monitor TCC lock up. 4.Shift solenoid this control the shift.5.TCC this will not cause (transmission toque control) but it comes close to the possibility. VCC the transmission vehicle speed sensor if this sensor get contaminated or looses its internal magnet strength then it will not know the shift program and it will do exactly what is happening to the vehicle this the VCC because it has an internal magnet and it strenght degrade due to heat you can be sure this is the problem sensor. Why did this break down you only did the fuel pump and disconnect the battery, Here is a theory as the fuel pump was going out the fuel trims adaptive strategy increase in long trim (injector on time increases) when you replaced fuel pump and disconnected battery you reset the adaptive strategy and the vehicle need to relearn. All sensor are now at a relearn and apparently the VCC cannot contribute like all the rest. The location of the VCC is top of transcase near right axle it is a three wire sensor

The 2003 Sunfire has been updated from Dexron II or III to Dexron VI per a Technical Service Bulletin from GM.

Automatic Transmission, 4T40-E Initial Fill..........6.5 liters
Automatic Transmission, Total Fill 4 speed 4T40-E..........12.2 liters

Good luck and hope this helps, if you do use Synthetic transmission oil, make sure it's a Low Viscosity Synthetic Transmission oil. High viscosity transmission oil will cause the gear shifting to stick and will cause shifting issues.

Thank you for using fixya and good luck.

Speed sensor maybe. Check the connector on the speed sensor and make sure it is plugged in good. if the connection is good then the speed sensor is probably bad

its your speedometer condensation builds up on the steel spindel and rust starts to form if you can get to it use a littel anti-rust lube [ not WD_40 ] and this should stop the jumping.