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If you're 3 liters low it thinks the solenoids aren't working because of a lack of line pressure. It's totally recoverable, just drain and fill and replace the filter and you're *probably* ok
When youre running such low pressure the input speed sensor and output speed sensor will send data that the ecu doesn't like because theyre not running well and it thinks the sensor is reporting improbable data. I see this in BMW's that don't get their ZF transmission serviced and then BMW sells them a completely new transmission because "going in and replacing the turbine speed sensor would cost $3000" when its quite literally just fluid dynamics ruining the show. Imagine trying to fill a bicycle tire but theres a hole in the pump line and you keep inflating and inflating but you think theres an issue with the pump.
You need to do a transmission service, make sure the level is correct, and overfill it a couple more times a half liter at a time to really flush the debris out cuz the fluid is burnt, thickened, and evaporated through the vent tube...
The pans unfortunately also develop porosity over time depending where you live and the gasket can also go out. Theres a lot of possibilities here but I don't care about the science of it I just want the car working again.
If you're 3 liters low it thinks the solenoids aren't working because of a lack of line pressure. It's totally recoverable, just drain and fill and replace the filter and you're *probably* ok
When youre running such low pressure the input speed sensor and output speed sensor will send data that the ecu doesn't like because theyre not running well and it thinks the sensor is reporting improbable data. I see this in BMW's that don't get their ZF transmission serviced and then BMW sells them a completely new transmission because "going in and replacing the turbine speed sensor would cost $3000" when its quite literally just fluid dynamics ruining the show. Imagine trying to fill a bicycle tire but theres a hole in the pump line and you keep inflating and inflating but you think theres an issue with the pump.
You need to do a transmission service, make sure the level is correct, and overfill it a couple more times a half liter at a time to really flush the debris out cuz the fluid is burnt, thickened, and evaporated through the vent tube...
The pans unfortunately also develop porosity over time depending where you live and the gasket can also go out. Theres a lot of possibilities here but I don't care about the science of it I just want the car working again.
wow thank you so much for this contribution
i will do a transmission service first before anything else.
i really wouldn’t want to open up the trans if they unnecessary
A VGS code is detecting a difference between the input and output shaft speeds, the output shaft is fluid coupled so if its not running well its going to see a slower shaft speed and therefore it's going to think your transmission is mechanically broken. The fluid coupling is more or less the only thing keeping the wheels spinning. Theres going to be a LOT of burnt fluid in the system so again I cannot stress how important it is to rinse the transmission by pushing extra fluid into it and letting it drain out.
Order 9L and just use all of it.. itll run better than new since all the break-in debris is still there. The entire system takes 9L
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
