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Shift 1 through 6 like it is supposed to but overdrive did not work

Tiny
ROCKY RATLIFF
  • MEMBER
  • 2016 DODGE RAM
  • 6.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 114,000 MILES
Only way transmission would work right would be to put into fourth gear manually. It would shift 1 through 6 like it is supposed to but overdrive did not work. Now must put into third gear manually and if it tried to shift into fourth it would act like it was in neutral and the only way to get it to work would be to stop and shut off the truck and restart it and put it into third manually.
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Wednesday, September 19th, 2018 AT 7:03 AM

26 Replies

Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, I am Danny.

Quick question first. Is the Check Engine Light on? A code might be stored for your Transmission issue.Having the Check Engine Light on means there is a fault code stored in your car's computer. Having the code checked is a great way to star diagnosis of your car's problem. If you do not have access to a code reader/scanner your local auto part stores (Autozone, Pep Boys, O'Reilly's) will check for free. If you get back to us with the code number(s) we will be happy to help. I have attached a tutorial showing what is involved with checking codes. Hope this helps and feel free to ask any questions. Thanks for using 2CarPros.
Danny-

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing
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Wednesday, September 19th, 2018 AT 3:29 PM
Tiny
ROCKY RATLIFF
  • MEMBER
  • 17 POSTS
Yes. The two newest codes are gear 4 ratio and low pressure sensor c circuit.
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Tuesday, October 9th, 2018 AT 8:30 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,256 POSTS
Hello,

Can I get the code numbers please? It sounds like the input shaft sensor is not working right or you have a shift solenoid that is shorted out. Please let me know.
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Friday, October 12th, 2018 AT 11:19 AM
Tiny
ROCKY RATLIFF
  • MEMBER
  • 17 POSTS
Where is the input shaft sensor located at?
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Tuesday, October 23rd, 2018 AT 12:15 PM
Tiny
ROCKY RATLIFF
  • MEMBER
  • 17 POSTS
I replaced the shift solenoid pack.
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Tuesday, October 23rd, 2018 AT 12:16 PM
Tiny
ROCKY RATLIFF
  • MEMBER
  • 17 POSTS
I have replaced both speed sensors and the transducer.
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Tuesday, October 23rd, 2018 AT 12:32 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,256 POSTS
With that many codes we need to clear them. Then without starting the truck turn the key on then scan for codes again to see what comes up. It looks like we have one issue causing the problems. This hard code check will point us in the right direction.
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Wednesday, October 24th, 2018 AT 10:44 AM
Tiny
ROCKY RATLIFF
  • MEMBER
  • 17 POSTS
I did that. The 2 codes that popped up after I cleared them and drove was p0871 and either p0882 or p0871. I will do it again.
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Wednesday, October 24th, 2018 AT 4:10 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,256 POSTS
Yes, clear the codes then don't start the engine, just turn the key on then run the codes.
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Thursday, October 25th, 2018 AT 4:59 PM
Tiny
ROCKY RATLIFF
  • MEMBER
  • 17 POSTS
I did that and no codes popped up.
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Friday, October 26th, 2018 AT 6:16 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,256 POSTS
Excellent. Now start the engine and shut it off and run the codes do not drive it.
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Friday, October 26th, 2018 AT 10:32 AM
Tiny
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  • MEMBER
  • 17 POSTS
Okay. I did that and still no codes.
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Saturday, October 27th, 2018 AT 12:03 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,256 POSTS
Okay cool, so we got p0882 and p0871 both transmission related codes. I have seen the TRS go bad causing the codes but we should do a pin th pin to make sure the connection are all good. Here is a guide to help us with that and the transmission wiring diagrams so you can see how it works with instructions on how to change out the TRS.

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (Below). Please let us know what happens.

Cheers, Ken
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Sunday, October 28th, 2018 AT 10:45 AM
Tiny
ROCKY RATLIFF
  • MEMBER
  • 17 POSTS
I seen that one of the pictures was for a 1500. I wanted the make sure that it didn't make a difference.
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Tuesday, October 30th, 2018 AT 12:28 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,256 POSTS
They should be the same, let me know if the colors do not match up but they should.
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Tuesday, October 30th, 2018 AT 12:14 PM
Tiny
ROCKY RATLIFF
  • MEMBER
  • 17 POSTS
Where is the trs located at?
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Tuesday, October 30th, 2018 AT 6:08 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,256 POSTS
Check out the diagrams above, it looks like the TRS is located in the valve body.
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Wednesday, October 31st, 2018 AT 11:21 AM
Tiny
ROCKY RATLIFF
  • MEMBER
  • 17 POSTS
Is everything the same as the 65 rfe as the 66 rfe? The diagram shows it is a 65 rfe. My transmission is a 66 rfe.
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Thursday, November 1st, 2018 AT 12:37 AM
Tiny
ROCKY RATLIFF
  • MEMBER
  • 17 POSTS
I replaced the transmission solenoid pack already. And I have replaced both speed sensors and the transducer.
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Thursday, November 1st, 2018 AT 12:39 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,256 POSTS
Nice, what is happening with the transmission?
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Thursday, November 1st, 2018 AT 1:00 PM

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