Transmission speed sensors?

TBIEDERMAN5

MEMBER
2003 DODGE NEON
2.0L
4 CYL
2WD
AUTOMATIC
165,000 MILES

I was driving my car and got off the freeway, stopped to get has and when I left the gas station I noticed it would not shift out of first gear. It shifts into drive and reverse just fine but when driven will not go beyond first gear. Before this happened it shifted extremely smooth and had absolutely no issues. We had changed the transmission control module and it did not help. Any ideas?

5 Replies

KEN L

MASTER CERTIFIED MECHANIC
47,720 POSTS

Hello,

This sounds like a typical input speed speed sensor issue. I would replace the sensor to see what happens. When this sensor goes out it sometimes does not trigger a code. Check out the diagrams (below). Please let us know what happens.

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Wednesday, February 24th, 2021 AT 6:03 PM

TBIEDERMAN5

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14 POSTS

Thank you, will try that soon.

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Wednesday, February 24th, 2021 AT 6:03 PM

KEN L

MASTER CERTIFIED MECHANIC
47,720 POSTS

Please let us know.

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Wednesday, February 24th, 2021 AT 6:03 PM

TBIEDERMAN5

MEMBER
14 POSTS

Changed input and out put sensors still doing the same thing these codes are up what next? P0755 shift solenoid b Transmission control system p0700. Shorted or open circuit within transmission control module failure of transmission control module. Faulty line pressure solenoid valve open or short in the line pressure solenoid valve circuit low transmission fluid level.

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Wednesday, February 24th, 2021 AT 6:03 PM

KEN L

MASTER CERTIFIED MECHANIC
47,720 POSTS

There is a transmission control relay I would check. Here is a guide to help you and the transmission wiring diagrams so you can see how the system works:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Also check for power at fuse # 21, 10 and 17.

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is. Sorry we should have done this first. My bad.

Cheers, Ken

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