Jump to content

Welcome to Nissan GT-R Heritage
Register now to gain access to all of our features. Once registered and logged in, you will be able to create topics, post replies to existing threads, give reputation to your fellow members, get your own private messenger, post status updates, manage your profile and so much more. If you already have an account, login here - otherwise create an account for free today!
Photo

Help with pressure sensor problem

- - - - -

  • Please log in to reply
11 replies to this topic

#1
awebcarfan

awebcarfan

    Stock

  • Member
  • Pip
  • 25 posts
  • Joined 06-May 17
  • LocationVictoria, British Columbia

I'm hoping someone can help me with an issue that has kept my car literally out of action for close to a year.

Back in July I had my oem sensor go and it kicked a code at 85 degrees in the trans like clockwork.

 

I had the trans taken out of the car and shipped to a mechanic who's recommended within our local GTR community.

He diagnosed the sensor issue and said I might want to consider some upgrades and I told him to fix anything he

saw that might be wrong. After all it was out of the car and open in front of him.

All told the final bill came to 11k for the Nissan dealer to drop the trans, the dodson parts, the service of the shop to

fix the transmission and the shipping for the transmission and the final re-install of the trans at Nissan.

 

For the first two weeks things were fine. the trans felt very tight, the slight 2-3 grind in my shift when the trans was

cold was gone, it felt great things were working well. Then suddenly the dreaded T/M Service light came on and I was

shocked. The car limped home in gears R-1-3-5 only and the accessport showed error codes P0797/P0842.

 

Basically one of the new dodson sensors was showing a failure. I took it to Nissan to see if the wiring was the  issue

since dodson sensors require a separate module be wired in to control the voltage. They re-wired everything and

because the code only was showing itself intermittently they kept the car for a few days and were about to give it

back and the error code came back once again. It seemed wiring was not the issue. Nissan wondered why the

faulting sensor was "stuck" at 485mv while the other sensor showed movement up and down and within tolerances.

 

I spoke to the mechanic who did the trans work he suggested he look at it and that i bring him the car. 

It took him several weeks of trying to get the code to kick so he could datalog.

When he did he finally get some data it showed the sensor go from 485 to 40mv which kicked the code.

Long story short they decided to drop the trans (again) and replace the sensor figuring it was defective.

They get the car all back together and now there is an issue with the inline sensor apparently. 

 

I'm wondering if any of you are or have ever had similar issues with dodson sensors or sensors in general?

I am running the required amount of DCT fluid, the Amsoil brand.

The module and wiring have been ruled out as the cause even though the times between the codes coming might

have been 20-30 starts of the car. 

ANY THOUGHTS OR INPUT ON THIS WOULD BE SO GREATLY APPRECIATED AND THANK YOU FOR READING!

TAKE CARE OF YOURSELVES DURING THIS PANDEMIC AND PRACTISE SAFE DISTANCING,


Edited by awebcarfan, 12 April 2021 - 01:31 AM.


#2
Ian201

Ian201

    Stage 1 Member

  • Member
  • 146 posts
  • Joined 28-September 14
  • LocationStenungsund Sweden

I'm hoping someone can help me with an issue that has kept my car literally out of action for close to a year.

Back in July I had my oem sensor go and it kicked a code at 85 degrees in the trans like clockwork.

 

I had the trans taken out of the car and shipped to a mechanic who's recommended within our local GTR community.

He diagnosed the sensor issue and said I might want to consider some upgrades and I told him to fix anything he

saw that might be wrong. After all it was out of the car and open in front of him.

All told the final bill came to 11k for the Nissan dealer to drop the trans, the dodson parts, the service of the shop to

fix the transmission and the shipping for the transmission and the final re-install of the trans at Nissan.

 

For the first two weeks things were fine. the trans felt very tight, the slight 2-3 grind in my shift when the trans was

cold was gone, it felt great things were working well. Then suddenly the dreaded T/M Service light came on and I was

shocked. The car limped home in gears R-1-3-5 only and the accessport showed error codes P0797/P0842.

 

Basically one of the new dodson sensors was showing a failure. I took it to Nissan to see if the wiring was the  issue

since dodson sensors require a separate module be wired in to control the voltage. They re-wired everything and

because the code only was showing itself intermittently they kept the car for a few days and were about to give it

back and the error code came back once again. It seemed wiring was not the issue. Nissan wondered why the

faulting sensor was "stuck" at 485mv while the other sensor showed movement up and down and within tolerances.

 

I spoke to the mechanic who did the trans work he suggested he look at it and that i bring him the car. 

It took him several weeks of trying to get the code to kick so he could datalog.

When he did he finally get some data it showed the sensor go from 485 to 40mv which kicked the code.

Long story short they decided to drop the trans (again) and replace the sensor figuring it was defective.

They get the car all back together and now there is an issue with the inline sensor apparently. 

 

I'm wondering if any of you are or have ever had similar issues with dodson sensors or sensors in general?

I am running the required amount of DCT fluid, the Amsoil brand.

The module and wiring have been ruled out as the cause even though the times between the codes coming might

have been 20-30 starts of the car. 

ANY THOUGHTS OR INPUT ON THIS WOULD BE SO GREATLY APPRECIATED AND THANK YOU FOR READING!

TAKE CARE OF YOURSELVES DURING THIS PANDEMIC AND PRACTISE SAFE DISTANCING,

Hi there

             try reaching out to sterod on GTRLife he`s in Ontario and i see he`s been involved in discussions about these Dodson sensors earlier he may have information that is valuable.

 

Otherwise the next step is Sheps Transmissions or Jack`s Transmissions in the US or Litchfield in the UK.


  • awebcarfan likes this

#3
awebcarfan

awebcarfan

    Stock

  • Member
  • Pip
  • 25 posts
  • Joined 06-May 17
  • LocationVictoria, British Columbia

thanks for the information I will check it out. the GTR specialist in Vancouver is in touch with Shep since he got the dodson parts from him and I have reached out to shep as well. I haven't talked to him since the replacement part has now shown issues I am trying to get more regular updates from my mechanic. he is very busy with other work and i guess with the intermittant nature of my problem the car will be at his shop for awhile longer. 


Edited by awebcarfan, 12 April 2021 - 02:26 AM.


#4
awebcarfan

awebcarfan

    Stock

  • Member
  • Pip
  • 25 posts
  • Joined 06-May 17
  • LocationVictoria, British Columbia

i also have been in touch with Michael at Dodson motorsports he has been very pro-active in helping me since the first dodson sensor showed a failure and i trust that between dodson, my mechanic and shep they will come up with a solution they could be looking at the trans fluid pump solenoid i am told as when it goes it can cause a sensor to stick however my sensor did not always kick a code, the car woud drive fine it was only within a minute of startup would the code trip if you made it past the first minute the car was fine. when it tripped i would use my accessport to reset the ecu and the car would drive fine with no issues again. like my friend said in terms of my car's problem "she should show her ass or her face but not both"....



#5
Ian201

Ian201

    Stage 1 Member

  • Member
  • 146 posts
  • Joined 28-September 14
  • LocationStenungsund Sweden

I did see that a guy on the UK forum had the same problem as you are experiencing but the thread ended without a solution. Such a pity that some people never finish the threads correctly when searching for solutions. 

The Dodson sensors seem to have caused a few headaches for people for one reason or another


  • awebcarfan likes this

#6
awebcarfan

awebcarfan

    Stock

  • Member
  • Pip
  • 25 posts
  • Joined 06-May 17
  • LocationVictoria, British Columbia

i have asked my mechanic what it would cost to go back to oem sensors, i had no reason to upgrade to the dodson ones as they don't do me any benefit other than they may turn out to be longer lasting once they work as they are supposed to. typically dodson stuff is top notch. thanks for the reply and i reached out the member on GTR Life hopefully I will hear from him.


  • Ian201 likes this

#7
Ian201

Ian201

    Stage 1 Member

  • Member
  • 146 posts
  • Joined 28-September 14
  • LocationStenungsund Sweden

Yeah, i'm sure sterod will be in touch he seems like a good guy i've been in touch with him previously, and he was quick to respond.



#8
socalaviator

socalaviator

    Stage 4 Member

  • Member
  • 535 posts
  • Joined 23-February 15
I had a couple sensors out of acceptable range when Shep Trans upgraded my transmission. It's a great idea to replace them when the Trans is out and open.

I highly recommend you send Trans to Shep for all your needs. He could've upgraded and made your Trans bulletproof at a fraction of the cost.

Next time have your mechanic drop it and then ship it to him. His fee to make an OEM Trans bulletproof is only around 2k.
  • droptopp likes this
RD Engineering. HKS GT1000 build. 1100+WHP

#9
droptopp

droptopp

    Stage 4 Member

  • Member
  • 2,171 posts
  • Joined 16-February 14
  • LocationNew York
Sorry to hear. +1 on just shipping it to Shep. It sucks but it’s usually better than the alternative.

Have you tested emailing John and asking for some guidance?

sales@sheptrans.com
Cicio Performance billet Crank 4.1 w/ CP billet pistons, Zenith R turbos, Cicio wet sump oling upgrade, flex fuel, ETS mid, down pipe, race FMIC, STM titanium axle back, ID2000s, Shep One K with drop gears, DS Axles, Volk Saga 18 10/12 (MT ET Streets), Advan GT Premium 20 R888. 1450+ hp / 1210+ tq

Old setups : more AMS motors than anyone I know - Alpha 9 w/ AMS 3.8, GTX3582R Gen II w/ AMS 4.1 billet crank, GTX3582R Gen II w/ AMS 4.0 big bore billet crank and of course FBO E85.

#10
jdmrb1

jdmrb1

    Stage 3 Member

  • Member
  • 395 posts
  • Joined 22-February 15
  • LocationYokohama Japan
SHEP hooked me up well with my sensor drama! Excellent to work with!

#11
awebcarfan

awebcarfan

    Stock

  • Member
  • Pip
  • 25 posts
  • Joined 06-May 17
  • LocationVictoria, British Columbia

Shep has been answering any questions I ask of him really quickly, and we both know there is only so much he can tell from a description. He suggests i could need some new wiring. the car runs great for awhile then the P0777 shows up every three weeks or so, i simply reset the ecu and the car drives fine. i have noticed it seems to kick the code when i am doing some spirited driving and the trans temp is 80 degrees celsius or above. 



#12
dinny

dinny

    Stock

  • Member
  • Pip
  • 26 posts
  • Joined 08-November 15

Shep has been answering any questions I ask of him really quickly, and we both know there is only so much he can tell from a description. He suggests i could need some new wiring. the car runs great for awhile then the P0777 shows up every three weeks or so, i simply reset the ecu and the car drives fine. i have noticed it seems to kick the code when i am doing some spirited driving and the trans temp is 80 degrees celsius or above.

Shep is great he helped me with a problem I had even though I was in Ireland




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users