I got trans failsafe prog come up on my bmw 535... a previous owner had a bmw740i box fitted back in 2002, so i decided to get correct 535i box installed, for a very reasonable price GBP340. But this fail safe prog still insists on popping up.. after reading up on this in a forum i was advised to check alternator....which was check and seems fine and was advised to check battery as even a voltage 0.5 of a volt could cause ghost errors...Batt checks out fine It has picked up voltage erros on a few other sensors on the car to, Coolant temp sens etc also could this sensor cause my car to run cold or would it just be needing a new stat? Many thanks... Craig
Check compatibility of gearbox ECM with gearbox. You will need the serial codes of the ECM and ask manufacturer for relative compatibility with gearbox type.
SOURCE: 1997 4.0 6cyl loses power intermittently Bad Coolant Sensor Light (replaced)
Replaced both CO2 Sensors.
SOURCE: 97 Dodge Ram Pick up cranks ok engine won't run
try checking all the ground circuits comming out of the PCM. and its also not common for a ground driver in the PCM to fail on dodges. also i have seen crankshaft sensors short out and take out pcm communication. so i would start by unplugging any sensor that runs off the 5v supply until the pcm wil talk to the scanner. if you unplug a sensor and communication returns to scanner then replace the sensor. and dont forget to check for good power and ground at the data link conector and PCM
SOURCE: BMW X5 Trans Fail Safe Program,
sometimes it will clear if you turn the X5 off and restart it. however, it could be an early indication that the tranny is about to expire. i have had it happen and it cleared with a power cycle, but also had friends where it cleared for a few weeks/months and returned. this time it was really the transmission that went bad. if you can't get it to clear, then i'd suggest taking it to the dealer and have them plug into it to have a better look.
SOURCE: ETC Engine Failsafe mode
you sure are correct on that one,too many sensors,encrypted software and manufacturers pin layouts in the OBDII connector,that are copyrighted so no snap on code reader will work.IN OTHER WORDS DEALER ONLY .GOOD JOB I RETIRE SOON
SOURCE: BMW X5 Trans Fail Safe Program,
IT'S VERY EASY TO RESET THE TRANSMISION'S COMPUTER. HOLD GAS PEDAL DOWN. TURN THE KEY TO THE NUMBER TWO. CONTINUE TO HOLD THE GAS PEDAL DOWN FOR THIRTY SECONDS.RELEASE THE GAS PEDAL AND PRESS THE BRAKE PEDAL FOR TEN SECONDS. NOW YOU CAN TURN THE VEHICLE ON. THAT SHOULD TAKE IT OUT OF SAFE MODE
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