I have had a gear box fault code appear on the dash a few times so last time I went to the dealer I had them check it out. They did not find anything wrong or any error codes. I just drove my car from Phoenix to BC over about 3500km and the gear box fault code appeared about 6 times. There is not much info on the internet about this so I'm hoping you guys can give me some feedback?

 

When did the msg display in the dash happen..do you remember if you just did something then it ocured:
Shift gears?
Was vehicle in "D" or were you paddle shifting?
Was it raining or extremely hot and dry outside?
Has battery gotten low or flat then this concern started to ocur?
Did you have a service then this started happening?
Do you still have the work order copy from the last dealer visit from this concern, did they write down a stored fault code?

 

The gear fault message only pops up for a second and it's when shifting to the next gear is happening. It lasts for a second then goes away and then everthing is normal. This can happen in D or when using the paddles.

When did the msg display in the dash happen..do you remember if you just did something then it ocured: Always happened when shifting gears!
Was vehicle in "D" or were you paddle shifting? has happened both ways
Was it raining or extremely hot and dry outside? NO
Has battery gotten low or flat then this concern started to ocur? NO
Did you have a service then this started happening? NO
Do you still have the work order copy from the last dealer visit from this concern, did they write down a stored fault code? The dealer checked out the car at the last service and found NO fault codes

 

This sounds exactly like what I had after they replaced my clutch. After MANY attempts at trying to figure out what it was and fix it, they finally removed the new clutch and found that it was slightly warped. They replaced this new clutch with another one and the problem went away.

 

There's no real other way to say this, but a dealer visit is in order. They will have to scan and see what the fault is, if your getting a trans error msg in the dash display..100% there is a stored fault in the TCM(transmission control module) or gauge cluster DIM, either way right now there's a fault stored ..Period!

With that fault things can be diagnosed further, I know in the past your dealer told you there was nothing..none the less, there is something now..

Like Jay_Davis stated, could be a warped clutch/flywheel, ecu's looks at the engine speed to the transmission input shaft speed, if when the clutch is applied and the input shaft speed does not decrease..aka good indication of a concern with the clutch/flywheel system, clutch system would be still turning the carbon prop shaft that would transfer drive to the input shaft of the trans..not saying at all this is your fault but once the fault code is discovered, this can be diagnosed further much more easier than guessing "what could it be?"..

 

Thanks Irish!

I do have 25,000 miles on the car and think it's on the original clutch so maybe the clutch is getting close to the end of it's life. The dealer is a 4 hour drive away but I will get it there soon.

 

FYI, with mine, I had numerous flashes of the error appearing on the display and absolutely no fault codes were stored. So don't expect it to be that easy.

 

It isn't a walk in the park unless you know what your doing, but if you had a error msg flashing in the dash, there is a code stored(heck you get fault codes for a burnt tail light in the CEM, the car will store everything..later years like 2010+ even show Pxxxx faults that I had "cleared" to see if they come back!). The only way there would be no faults stored is if you completed all the ness drive cycles back to back error free for the trans to delete the fault on it's own(good luck on this). If you can cause the fault that day and go to the dealer, and even do the fault with them present..there is a fault stored, that I am 1000000000% correct.

 

An error message flashing on the dash does not guarantee a code was stored. Period. I had the transmission fault error flash dozens of times and not a single code was stored.

 

Jay, I don't know what your background is, but Irish07 has a proven track record of knowing his sh*t when it comes to Aston Martin—more than anyone else on this forum (save for AMFixer, perhaps). If he says the codes are stored somewhere, I tend to believe him; unless proven otherwise and not just by anecdotal evidence.

 

WOW. I went through weeks of troubleshooting this clutch problem with the dealer and Aston techs. The error codes flashed and no codes were stored. I really don't care who you believe.

And people wonder why bad information becomes "fact" on the internet.

 

If your flashing a error trans msg, fault is stored, that's if ecu's were running normally and not glitched/corroded/faulty..you would have stored a fault, that is no debate.

Now if your flashing a error msg and not storing a fault, its possible, this world is not perfect, but you would be having a fault with either the TCM sending this msg to the DIM(error with TCM ecu), or the DIM it's self is erroring and flashing this msg with no fault(error with DIM ecu)...again anything is possible..in a perfect world, with msg flashing you would have a stored fault.

Otherwise, you should have mis comm faults at least stored, CAN network failure..anything..something..there can't be NO faults at all in any of the ECU's that can lead to a direction

There is no mis-information in this thread, I have no reason to fead your mouth with BS..believe as you wish, sry we couldn't be much more help, nobody is going to be able to diagnose this further other than a person with your car and a AMDS in hand

 

I wonder if it is sensing low ASM pressure. Vanquish would display "gearbox fault", when the ASM pressure was to low. It would happen at first start-up and at times while driving and shifting gears. It would never throw a fault code, unless it got really bad or was unable to correct the pressure.

 

I thought of that, but vantage has the hydraulic pressure sensor..so low pressure would strike P0868, even faulty circuit for pressure sensor would flag P0934/P0935..I'm stumped on the no faults

 

Eventually my problem was solved by replacing the clutch. The problem started after a new clutch was put in so the last thing they thought was wrong was the new clutch itself and none of the diagnostics showed anything wrong. The new clutch that was throwing this error was apparently very slightly warped.

It was just periodically flashing that gearbox fault error for a split second on a shift. Because there was no code stored it took a bit to convince the dealer that it was a problem until it flashed while they were driving.

As per the original poster, my point was simply that telling him that the dealer will definitely be able to read a stored code and tell him what his problem is may not be true.