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My 97 honda odyssey speedometer is jump up and down from 0 to 60, but the speed stays the same, and the check engine light came on what can cause that. do i need a new speedometer?
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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.
you replace battery you disconnect your pcm.its trying to relearned it program.drive it around a little some times it will relearn it self run normal. but if it dont get better take it to honda dealer let them reprogram it.
?? Does it move on the road ? You could have a worn out CV joint that allows the transmission to free-wheel. If that is the case, replace immediatly, or the transmission differential will fail.
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