[aarongtr]

AGREE COMPLETELY!!

I would venture to say that there are far more OEM sensors out there than Dodson ones so of course they're going to fail more. My trans has 138k miles on it before the seal failed causing me to change out the sensors since I was in there. They very next day I got a trans code and now my trans has to come back out to replace a faulty sensor making me wish I would have just left the OEM ones in. Fuck that. I'm not sold on these Dodson sensors. They make good gear and clutch components but whatever entity they are buying and branding these sensors from have very poor QC. As far as I know there is no way to even trace them by production or lot number so it's a crap shoot hoping you don't get a bad one. $150-200 for something they bought in bulk and threw in a Dodson box and won't even admit there's a problem.

 

[Agent Ezzard]

At some point I am going to start a new thread about my trials and tribulations to aid the community regarding my Dodson sensor issues and what I did in order to help my shop pinpoint the sensor. Seeing as how this thread is relative to my findings I'll post a screenshot of my log to show what the sensor was doing and how erratic it is. The car can be driven in its current state. I'm waiting on my local shop to clear up some time for me to drop the trans again and change it out.

See Below:

 

[aarongtr]

well the OEM sensors seem to fail more than the Dodson so I'm not sure that is good advice or not, but I think what's important is that as a group we have identified a known issue and Dodson and their dealers stand behind the product to make it right.

it would be typical for things to get brushed off as "one bad sensor" but that's clearly not the case

the OEM sensors do not require an additional mounting of a control module. I have had that wired, then re-wired another two times just to be sure that wasn't the problem (starting with the easiest things first, right?).

that wasn't it so William replaced the wiring loom and line sensor after having my car at the shop for 100 days waiting for the code to come back, he caught a drop in the line sensor so he repalced it and it drove fine so he felt all was good.

i drove maybe 23-30 times in 45 days and a new code came back (P0807). i think the best move is to drop the trans and go all OEM sensors again and pull that module out. the problem doesn't seem to want to go away so what else can you do?

 

[aarongtr]

How many out there are experiencing Dodson sensor issues within say the past 12 months? My issue began about a year ago when my oem sensor failed. Just list your GT-R LIFE name only please. Thanks!

 

[Wicked]

At some point I am going to start a new thread about my trials and tribulations to aid the community regarding my Dodson sensor issues and what I did in order to help my shop pinpoint the sensor. Seeing as how this thread is relative to my findings I'll post a screenshot of my log to show what the sensor was doing and how erratic it is. The car can be driven in its current state. I'm waiting on my local shop to clear up some time for me to drop the trans again and change it out.

See Below:

Yes please let us know your findings. I see in the pic Clutch A is following the way clutch B is.

 

[Agent Ezzard]

If you look at Clutch A voltage it should never be below let’s say 440mV. Anything below that it will cause limp mode. Sensor A is at 140mV then gets erratic, goes back to 140 Mac and jumps to 440mV. I was driving the car in limp mode at the time and that’s why clutch B was moving around because those are the only gears I had.

 

[FauxshowGTR]

How many out there are experiencing Dodson sensor issues within say the past 12 months? My issue began about a year ago when my oem sensor failed. Just list your GT-R LIFE name only please. Thanks!

Count me in. Maybe make a new thread? Mine started in February with my Shep 1.5 build installed by ACG

 

[aarongtr]

Count me in. Maybe make a new thread? Mine started in February with my Shep 1.5 build installed by ACG

I got this reply from Mike at Dodson yesterday...." I'm not sure if that code relates to the sensor, but clear it and let me know if it reoccurs. There have been a few isolated cases recently in regards to the sensors and we are definitely on top of it. We have pulled our entire stock and comprehensively tested them but in any event, we have changed the design to something a lot more robust and will be arriving with us this week."

 

[aarongtr]

Of course they can't replicate the placement of the sensor in the trans and throw hot fluid at it for hours or days to see if a failure occurs (as it did in my case) during their "comprehensive testing". i think they should have pulled whatever stock they had from their old batch of inventory and waited for this new design to arrive.

 

[240Z TwinTurbo]

The TCM reads mV as opposed to the actual pressure value. When you run our 68 bar sensor as opposed to the factory 28 bar sensor, The mV reading changes by a factor of 2.4. Our scaling box changes the mV reading it sends to the TCM so the resolution with our box is identical to that of the OEM setup.

Just to follow up, I did NOT use the box. I simply rescaled the sensor voltages in my map and I have been running it this way for over a year now with zero issues. You need only adjust 5 tables. Clutch A Sensor 1 & 2, Clutch B Sensor 1 & 2, Line Pressure. Simply change the upper value for all 5 to 870.23 for the Dodson sensors.

I purchased 3 new sensors from Shep, which are not Dodson, but one's he says are pressure equivalent. I was curious about your value of 870.23psi because that would be 60bar. Should you not be using a value of 986psi for 68bar?

 

[sterod]

I purchased 3 new sensors from Shep, which are not Dodson, but one's he says are pressure equivalent. I was curious about your value of 870.23psi because that would be 60bar. Should you not be using a value of 986psi for 68bar?

I believe the reason for doing that was to reduce the linear range so that the clutch recalibration feature would still be able to function but I could be wrong it may have been for another reason but this was the value that was given to me by Dodson

Sent from my Pixel 5 using Tapatalk

 

[240Z TwinTurbo]

I believe the reason for doing that was to reduce the linear range so that the clutch recalibration feature would still be able to function but I could be wrong it may have been for another reason but this was the value that was given to me by Dodson

Sent from my Pixel 5 using Tapatalk

Understand and thank you for the prompt response. Shep said to initially scale to 65bar. However, if 65bar did not provide enough resolution and failed the relearn, then scale to 70bar.

 

[240Z TwinTurbo]

Understand and thank you for the prompt response. Shep said to initially scale to 65bar. However, if 65bar did not provide enough resolution and failed the relearn, then scale to 70bar.

I scaled the Shep sensors to 65bar (942.7psi) and it had no issues performing the relearn.

 

[Agent Ezzard]

Just an update to the Dodson sensors failures. I was informed by a Dodson dealer that a Dodson sensor that was installed failed under ten heat cycles. That sensor was one of the three that was installed. All three were then changed out and and new ones installed. The one that failed was sent for testing. Now out of the three new ones that were installed under warranty I have what can be assumed as another failed sensor since it’s exhibiting the exact same behaviors as the previous one just on a different clutch line. My trans has to come back out again to change out that one now. Most likely part of the same batch. But we will not know for sure until that was is returned for testing.

Right now I would explore options for replacement pressure sensors. I’d look into SSP and Shep has another option I’m probably going to try.

 

[240Z TwinTurbo]

^ that sucks because depending on the sensor you likely have to pull the trans. Can you detail the symptoms you had that led to determining the sensor failed? Shep said he stopped using the Dodson sensors and the one he sells is from a different source. I guess time will tell on the longevity of his sensor.

 

[Agent Ezzard]

Oh I definitely have to pull the trans again. And yes Shep did say that about the sensors. It really does suck that I and the shop that did the install have to go through this when they, as well as I had confidence in the Dodson ones.

I will start a new thread that I will link here as well so that it would be easier to search for when I get on a PC. This iPhone keyboard really jacks up my sentences.

My Thread Here

 

[FauxshowGTR]

FYI 2 weeks ago ACG dropped the valve body and replaced my faulty Dodson sensor with a new sensor. Everything is currently working fine, but the original sensor also was fine for ~1000mi before failing so I’ll keep my fingers crossed.

While a hassle, Shep and ACG covered all of this under warranty...I’m not sure if it’s A New sensor design or just a new sensor but

 

[aarongtr]

Mine is going in Monday for a new set of the Dodson plug and play sensors that don't rely on the module. i was thinking of going with a new tranny wiring loom as well I don't really know if after three transmission removals I would feel like taking a chance on a fourth. I will update how it goes ...I found a weird short in my a/v unit the last time I started the car a few weeks ago. Then when using my car today for a quick 5 minute drive the code kicked and i heard static in my passenger side speaker, like a very low staticy morse code type noise that went away after a few seconds. I tried to reset the ecu with my a/p that did nothing, I reset the dodson module in the trunk and that cleared the code and the car drove home fine...strange. I'm wondering if a short in the a/v system could be affecting the B sensor? I know it's a long shot but the timing was uncanny.

 

[GTRMIZ]

any new update on the sensor issues?

 

[aarongtr]

^ that sucks because depending on the sensor you likely have to pull the trans. Can you detail the symptoms you had that led to determining the sensor failed? Shep said he stopped using the Dodson sensors and the one he sells is from a different source. I guess time will tell on the longevity of his sensor.

I emailed shep a few weeks ago and he still uses Dodson plug and play sensors, that's coming from Shep himself.