SGII/Tranny

Cowcatcher · **Posted:** Mon Jan 28, 2008 11:47 am

I love my SGII when it works but I am unplugging it. Someone else speculated on the issue but I am prettyu sure I documented it on a white knuckle trip this weekend from Spokane to Portland and back. On my way down the SGII quit after about 20 miles and the transmission also dropped out of overdrive while speeding down the freeway. After about a 100 miles, for the first time in my memory, the MPG came back but was not properly displaying. It was showing something like double actual mileage. After a refuel stop it was working again for about 80 miles but the next time it stopped was simultaneous with the next overdrive dump.

On the way back the roads were an understated BAD. I drove for 2.5 hours with the SGII connected and it never quit. Of course I never got over 45 miles per hour so the overdrive never kicked in.

So, I think there is an incompatibility between the SGII, the buss and the 5 speed transmission. I am unplugging my SGII except for killing CELS until I know the issue better.

gmctd · **Posted:** Mon Jan 28, 2008 12:36 pm

Good report, and chalk up another for the '06's - betcha it's the ESP\4WABS anti-skid enhancement which the '05's do not have one of

bugnout · **Posted:** Mon Jan 28, 2008 1:00 pm

Very interesting. What gauges did you have displayed?

retmil46 · **Posted:** Mon Jan 28, 2008 1:06 pm

Doing the same on my '05 - and it's done it twice at less than 50 mph - ie, not in lockup.

Recorded code P0884 - basically means the TCM rebooted itself while driving. Doesn't throw a CEL and can't read it with the SGII or the odometer trick - need a full-fledged scan tool to dig the code out.

If you can, might want to drop by a decent tranny shop or mechanic that has one of the high-dollar scan tools and see if it pops up this same code.

Tranny shop didn't find anything wrong with the connectors or otherwise on mine that would explain the reboot - their primary candidate was also the SGII.

Haven't had any repeats since disconnecting the SGII.

Cowcatcher · **Posted:** Mon Jan 28, 2008 1:17 pm

I had cut back on display to MPG and Coolant Temp.

RETMIL - Reliable tranny shop? What's that? :lol:

gmctd · **Posted:** Mon Jan 28, 2008 1:21 pm

We need an official fact-finding poll on this, '05 and '06, as to how the SGII affects the system, and which symptoms are effected - our '05 is non-affected when the SGII drops out, and the SGII recovers only with IGN power-cycle, key off then key on - we have the EDGE Trail module set for towing, so any ECM-enhancement needs to be listed for each case

Cowcatcher · **Posted:** Mon Jan 28, 2008 1:26 pm

On another subject, I am stuck at home so I need to go fire up the John Deere. I drove to Portland early Saturday and when I tried to return late I chickened out after going 20 miles up the Columbia Gorge in a snow and ice storm since I likely didn't meet Oregon tire standards and I have little faith in my Toyo AT's on ice. I stayed the night then headed out for the 370 mile return trip at 7 AM. It took 9.5 hours. When I got home I had a trail busted as my daughter and her boyfriend had stopped by in the Fire Department '07 Dodge Durango about 5 hours and 3" of snow earlier and barely made it up my 1/4 mile driveway with chains all the way around the Durango. I drug all the way in and had to stop and take another shot at one hill running in 4W Low but I made it. I could not get turned around though because then the snow was so wet it was a tad bit away from slush. Now it has dropped to 17 degrees and I need to plow for several hours to make way for the next 9" to 15". We have had over 30" since the first of the year which is about triple our average snowfall. YIKES!

geordi · **Posted:** Mon Jan 28, 2008 1:37 pm

Count me in for the tranny drop-outs, it's done it twice to me while towing, and twice since then (I only towed one 500 mile trip since I got it) but it quits fairly consistently if I stomp on the go-button and the tranny downshifts from the requested power. Gentle acceleration, and the SGII will keep working for the better part of 50-60 miles. But usually not longer than that.

I used to have the display set on MPG, MAP, LOD, and GPH, but it seemed to lock up more frequently. Now I have it on MAP, LOD, IAT and Water temp, and it lasts longer. I do think we need to set up a group-contact to the SG people and get some research and support for this. Otherwise... Why have it? If it's CAUSING a problem with our vehicles, that needs to be dealt with, pronto.

Joe Romas · **Posted:** Mon Jan 28, 2008 1:39 pm

gmctd wrote:

Good report, and chalk up another for the '06's - betcha it's the ESP\4WABS anti-skid enhancement which the '05's do not have one of

I think your rght :lol:

VAG-COM tells me it can't communicate with the ABS and reports a cel because of it :cry:

When I'm done playing with VAG-COM I have to clear the error and imediatly exit so it does not pop up again :oops:

gmctd · **Posted:** Mon Jan 28, 2008 2:26 pm

Reports don't contribute much if the suspect vehicle is not specified, either in the body of the text or the usual sig - everybody wants to get into the act, so that keeps CRD data separated from all those other, lesser vehicles

clday25 · **Posted:** Mon Jan 28, 2008 3:13 pm

Someone creative come up with a catchy acronym for this SGII/Tranny mystery.....

To date, I’ve had this happen a minimum of five times to my ride, the last two occurring this past weekend. Typically I have RPM's, GPH, LOD and FWT displaying and i don't usually clear the cell. I'll have to unhook the SGII and see if this helps.

If I remember right, I don't think the SGII had locked up yet when it happened this weekend as I cruised down the freeway. Wondering if that is a factor or not, plus, I really don’t think I had this problem pre-SGII???

Humm……
Chris

thewalker350 · **Posted:** Tue Jan 29, 2008 1:43 am

I guess I started this idea about the SGII and the tranny issue in a previous post. My transmission would dropout after 50mph shift and after 60 mph lockup under different situations and never the same way twice. After disconnecting the SGII it hasn't dropped out once and that has been around 3,000 miles ago. I have an "05 Limited with the F37 and piece of crap TC. My SGII is now only for clearing codes after I reconnect my MAF and EGR connectors.

retmil46 · **Posted:** Tue Jan 29, 2008 1:38 pm

On mine - Inmotion Stage II tune, Suncoast TC/Transgo Shift kit/new design pump, Amsoil tranny fluid, 245/70 tires, gauges usually set to MAP/IAT/FWT/GPH, more recently to FWT/IAT/MPG/GPH.

Tranny drop-outs starting occurring a couple months after Inmotion Stage II tune, and within a couple weeks of changing tires. At the same time, I started making it a habit to clear the ORM CEL on each startup where previously I had just let shine away.

mark2m · **Posted:** Thu Jan 31, 2008 12:35 pm

I just recently purchased a DashDyno and have had the transmission drop down also. I don't remember what it was displaying, most likely Boost, RPM, Fuel Rail Pressure and RPM. Don't know if it was working properly or not at the time the trans drop out. As I had it sitting in the seat next to me. I wasn't driving more than 45mph when it happened and it was very pronounced. It dropped down hard enough that I was looking around to see if I hit anything.

stump doctor · **Posted:** Thu Jan 31, 2008 8:48 pm

My 2006 does ever so often, I can say "I think" that it did not drop out before SG II, I have 80,000 miles and few beers tonight, there fore I am not sure. At this point I'm running volts, map, air temp and RMP and it dropped out Sunday. It has dropped while running map, air temp, mpg and mph, also map, air temp, water temp and mpg. My first thought at the first time was trans filters and fluid change and it has happened after and still happens ever now and then. I have noticed dropping seams to occure at ~ 59 or 60 mph and 1700 to 1750 RMP. I think it time for more beer! I will unplug for a test!

tha3rdman · **Joined:** Sat Mar 18, 2006 3:28 pm **Posts:** 10

A thought/Theory, I dont hvae the SGII but was seriously considering purchasing one, when you wire it up is it just plugged into the system connectorts with no other connections? If so and the TCM is complaining about low power, is it possible the little power the SGII is pulling is enough to drop the voltage low enough to aggitate the TCM, they are fairly small wires. Maybe some one with an issue could run a supplement hot and ground closer to the SGII. OR maybe I have no idea what I'm talking about.

gmctd · **Posted:** Fri Feb 01, 2008 1:31 pm

That code usually means something happened that caused the ECM to stop and then it re-booted - if the SGII was trying to talk and the ECM needed to talk, the up would stop, timeout, then reboot, with result similar to a control\alternate\delete - it's called buss contention, where some cpu's lock up and never recover until power cycle - not even good for automotive service, very unsafe at 70mph

Cowcatcher · **Posted:** Sat Feb 02, 2008 2:29 pm

I contacted Linear Logic abot this issue and suggested they monitor this thread. James DeLong contacted me and told me that they were unaware that there was an issue so they are now engaged. I suggested that he log in and ask questions to better identify the issue. Not sure if he will but I am sure they are reading. Pablo or someone here lives not far away from their offices, pehaps he can be a lab for them.

geordi · **Posted:** Sun Feb 03, 2008 1:29 am

While I have not had my 05 CRD (Just so everybody knows what I've got it in) do the tranny drop recently, It HAS done it, both while towing and not towing. The non-towing time was no more than 5-7 minutes after starting the engine (I have the same drive almost every day) while when it did it to me while I was towing, it was after a looooong time.

Towing, it happened on cruise once, and not on cruise another time. Same day, this was during one 500 mile tow trip.

I do not disconnect it from the KJ at all, but I have been making notes about the device's lockup behavior, in hopes of helping find a fix. Thus far, the tranny drops and the SG locking up do not seem to want to happen at the same time, or even with any specific predictability. The SG even managed to lock up while the KJ was sitting and just idling for about 30 minutes today. The KJ had not been moved, only started and left running, so that begs the question: What is going on in the datastream that causes it to lock up? I had thought it was due to excessive data fluctuations, like suddenly stomping on the gas and forcing the Jeep to downshift.

To me, that would mean that the databus is now talking to itself about the TPS, speed, rpm, fuel mapping, torque mapping, and transmission position all at the same time, and all fluctuating wildly... And the SG just can't keep up, or is rude to the rest of the children and told to be quiet by momma ECM. But in the absence of that sudden input... What happened this time?

Could the smarter people who made the SG please help us here? Thanks!

gmctd · **Posted:** Sun Feb 03, 2008 1:52 am

Not all at the same time - just faster than you, and the SGII, can imagine - it's buss contention, increased specific-address poll\response where SGII calling plays from the sideline is suddenly in the way, and loses it's way.

SGII/Tranny

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