TRANS.FAILSAFE-can be driven in this mode for how long?

[omodos]

Originally Posted by andrewwynn

Have you looked at all the electrical connections? When I was having random issues with engine turned out the connector at the DME was dirty. There should be connectors at the transmission and TCM in the e-box that can be addressed.


–awr–

Using Tapatalk VIP on iPhone

Personally not checked but to be frank latest mechanic does think its electrical, have driven 80miles since the code reset, BUT not tried to tackle the hill of death yet...may do it tomorrow and see before getting to him

[andrewwynn]

When mine acted up I could go weeks without a problem but usually happened right away after a big splash of water from a passing semi truck. Was always water in a connector in my case. I eventually just filled the whole connector with dielectric grease to pre-fill and exclude water ingress in the future.


–awr–

Using Tapatalk VIP on iPhone

[wpoll]

Originally Posted by omodos

... but if the codes are wiped wiped I guess i have to replicate conditions to create the fault, although research I have done says you may not get fault back but still have a delayed/pending reading and read only after being detected under multiple drive cycles or under specific driving conditions (quoting wot i found online)

You're over-complicating this.

Codes were reset, so no codes in error memory.

You drive the car and it goes into limp mode. Error codes related to the reason it went into limp mode are stored in the error memory.

You shut down the car and re-start - limp mode now gone - but stored error codes are still in error memory.

Mechanic reads codes and diagnoses issue.

See? Simple.

Taking the car to the mechanic while it's in limp mode will tell the mechanic nothing additional and is a waste of time.

[omodos]

Originally Posted by wpoll

You're over-complicating this.

Codes were reset, so no codes in error memory.

You drive the car and it goes into limp mode. Error codes related to the reason it went into limp mode are stored in the error memory.

You shut down the car and re-start - limp mode now gone - but stored error codes are still in error memory.

Mechanic reads codes and diagnoses issue.

See? Simple.

Taking the car to the mechanic while it's in limp mode will tell the mechanic nothing additional and is a waste of time.

Hi Wpoll currently am at stage of codes reset by mechanic so none in memory now...tried to reluctantly invoke limp mode by doing drive pattern that caused limpmode and couldnt...did drive twice , so not sure at this point pluggin in to scanner will shed any light

[omodos]

Well he rescanned , and no alerts regarding the trans directly...had alerts re glow plugs to be frank not sure i.noticed any bad starting or running or if impacts transmission.he mentioned the possibility of soiled wet connectors , and or yup the transmission fluid possibly being spent...needs car for minimum 2 days to dig deeper and longer to resolve...yup as Wpoll said its a tricky one as never managed to replicate...mechanic said it will happen again when temps rise. End of the day battery is good 13.9 14.0v is where i am its not a constant value mind you floats between those 2 values....fluid level checking pending....and he mentioned transmission oil temp sensor....fun times biggest pain is getting hold of another daily runner and not knowing if when X that is currently running will be fixed if you see wot i mean. If got a leak then need the service kit ...if i dont have a leak need to decide if drain of old fluid and replenish will cause more problems ,at 117k miles i believe am in danger.zone when comes to replenishing ..
Im hoping its a connector issue on the various components mentioned in post...but water ingress nope cos had issue during hot dryyyyy summer too...again massive thanks to all thus far for all input.

[haigha]

FWIW, when I had the low fluid and leaky mechatronic sleeve my Trans Failsafe only occurred when the ambient temperature was < 10 C. On warmer days, it didn't happen.

[omodos]

Originally Posted by haigha

FWIW, when I had the low fluid and leaky mechatronic sleeve my Trans Failsafe only occurred when the ambient temperature was < 10 C. On warmer days, it didn't happen.

darn tricky one to figure out, both mechanics told me when temps go up i will get problem more...at the end of the day if there is a leak that needs to be addressed first as cant be good....tad surprised that hasn't been first port of call by new mechanic, I will gently nudge him to check this (first one had told me he checked but as mentioned there was no sign at all of the splash gaurd having been removed which is only way to reveal transmission gubbins, so don't trust him, mind you he may have used an endoscopic camera)

[omodos]

Some news back on second day, there was a crack/cut in the turbo intake hose if you see pic, hopefully some 3.0d turbo owners can chime in, if this has consequence any bearing on the trans.failsafe.prog.

AND the transmission temp hits 99c which he told me is too high especially now as we low ambient temps...in the space of 40mins (not sure he was driving it and monitoring probably not) we had below changes

oil temp engine 72c to 85c
oil temp transmission 69c to 100c

He suggested we do the fluid change now or soon.....

[g300d]

That hose shouldnt, but you know BMW's, you may be surprised.

Turbo lines are high priority IMO, could cause a bad mix condition and trouble.

Fluid changes are always good IMO. You can also gain insight on condition of transmission by oil condition, filter contents, and pan debris.

[omodos]

Originally Posted by g300d

That hose shouldnt, but you know BMW's, you may be surprised.

Turbo lines are high priority IMO, could cause a bad mix condition and trouble.

Fluid changes are always good IMO. You can also gain insight on condition of transmission by oil condition, filter contents, and pan debris.

Thanks sir I will soon post a new thread related specofically to this