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Re: 47RE Stuck in First Gear *** SOLVED***
[Re: akauto]
#1807687
04/20/15 01:17 PM
04/20/15 01:17 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,376
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Anything is possible.
Generally on an electronic transmission, when a speed sensor goes, the vehicle will go into "limp home" mode. My only experience is with a GM vehicle with a 4L80E, it will start out in First and shift into Second gear, then stay there until you turn the engine off and restart. Then it starts out in First, goes into Second, and stays there again.
When this happened to me a new speed sensor was $28 and could be serviced from the outside of the transmission.
Side note not related to OP question: On transmissions with two speed sensors, the computer looks at input and output speed to calculate if the trans is slipping, as it "knows" the gear ratios and also what gear the transmission is in.
R.
Last edited by dogdays; 04/20/15 01:17 PM.
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Re: 47RE Stuck in First Gear *** SOLVED***
[Re: akauto]
#1807798
04/20/15 03:33 PM
04/20/15 03:33 PM
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Joined: Jan 2003
Posts: 25,747
Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,747
Rio Linda, CA
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Hey all. Im new to the forum. Im having a similar issue with a 2000 ram 2500 4x4 auto 5.9 gas motor. Truck has reverse and 1st gear only. Will not upshift. It has a CEL on i scanned it and it has codes for misfires only no trans codes at all. I just bought the truck knowing it had the trans issues. My question is can it still have this type of trans speed sensor issue without throwing a code? Any help would be great i need to get this thing on the road. Thanks! Welcome to the board. This is a common problem and won't always trip a code; the usual drill is to replace both the governor pressure solenoid and governor pressure sensor...both are accessible with just the trans pan removed.
The INTERNET, the MISinformation superhighway
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Re: 47RE Stuck in First Gear *** SOLVED***
[Re: dogdays]
#1807828
04/20/15 04:05 PM
04/20/15 04:05 PM
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Joined: Jan 2003
Posts: 2,724
541 slobovia
A990
master
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master
Joined: Jan 2003
Posts: 2,724
541 slobovia
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Anything is possible.
Generally on an electronic transmission, when a speed sensor goes, the vehicle will go into "limp home" mode. My only experience is with a GM vehicle with a 4L80E, it will start out in First and shift into Second gear, then stay there until you turn the engine off and restart. Then it starts out in First, goes into Second, and stays there again.
When this happened to me a new speed sensor was $28 and could be serviced from the outside of the transmission.
Side note not related to OP question: On transmissions with two speed sensors, the computer looks at input and output speed to calculate if the trans is slipping, as it "knows" the gear ratios and also what gear the transmission is in.
R. Some years back, our 99 Dakota was stuck in 1st. It threw codes for the trans sensor & solenoid and I replaced em. Long story short, it turned out the rear o2 sensor was bad, and didn't report the warmed up CC and the mismatch caused it all. Ken
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