[PreslavLilov]

Hello, I apologize in advance if this issue has already been discussed. The car is Bmw m5 e60 2007 with SMG gearbox 84k miles. I bought the car with this problem. Car starts and runs great but won't move. The gear lever lights up and changes gears. It also shows the gears on the dashboard . I was told it might be the gearbox actuator. Others tell me it's the hydraulic pump or clutch. How can i find out what the problem is? Diagnostic in service firstly?

 

[Boise567]

You need to find out what the pressure is like in the smg unit and what error code(s) you’re seeing for the transmission?

 

[PreslavLilov]

You need to find out what the pressure is like in the smg unit and what error code(s) you’re seeing for the transmission?

To go directly to a service center with good diagnostics. Does it make sense to lift the rear wheels up in the air and see if they will spin with no weight at all?

 

[Boise567]

that would be meaningless. You going to need to look at the error codes and how is the pressure in smg. You need at least 48 bar for the car to be able to engage the gear and move. Lit on the shift gear is once again meaningless because it can still lit up even if there is no pressure in the system.

 

[PreslavLilov]

that would be meaningless. You going to need to look at the error codes and how is the pressure in smg. You need at least 48 bar for the car to be able to engage the gear and move. Lit on the shift gear is once again meaningless because it can still lit up even if there is no pressure in the system.

That’s the fault codes. How to check the pressure in smg?

 

[PreslavLilov]

That’s the fault codes. How to check the pressure in smg?
View attachment 971972

 

[jbash87]

First off diagnosing this car is going to be nearly impossible w/o the proper software. Get set up with INPA and/or ISTA on a windows laptop with a good OBDII to USB cable. Then you will be able to check the pressure as @Boise567 suggested.

Secondly. All those codes are "absent". I don't know much about those scanners but I would assume they would be "present" if the fault codes were currently a problem. Can you clear them and see what happens?

Lastly. Do a little research on this forum. There are TONS of SMG diagnostic threads which will help you out.

Welcome to the E60 M5 life!

 

[PreslavLilov]

First off diagnosing this car is going to be nearly impossible w/o the proper software. Get set up with INPA and/or ISTA on a windows laptop with a good OBDII to USB cable. Then you will be able to check the pressure as @Boise567 suggested.

Secondly. All those codes are "absent". I don't know much about those scanners but I would assume they would be "present" if the fault codes were currently a problem. Can you clear them and see what happens?

Lastly. Do a little research on this forum. There are TONS of SMG diagnostic threads which will help you out.

Yes, I clear the faults, faults gone. But nothing happened 😁

 

[Boise567]

I am not sure where to find the pressure with your tool so you should maybe look through the menu to see if it’s there. Inpa or ISTA will absolutely show the pressure of the smg unit.

The most important code I noticed is 4f40 which translates to target pressure is not reached in a reasonable amount of time typically referred to the weak pump motor or leak in the gear pump or leak somewhere in the hydraulic unit, even if you have a leak in the upper block. I think at minimum that the car should be able to build sufficient pressure to engage a gear. I think you are more than likely have issue in the lower block. Although, It might not be a bad idea to clear codes and see what comes back.

 

[flacoramos]

I've seen something like that before. Someone's car clutch was toast. Toast to the point of zero power transfer to the wheels. Smg read fine, shifted gears, clutch position changed as needed.

That's a trans out job. At least clutch and likely everything inside the bell housing.

Of course could also be anything downstream the smg. Driveshaft, diff, axles. Forget the computers, get under the car and take a look.

 

[Boise567]

I've seen something like that before. Someone's car clutch was toast. Toast to the point of zero power transfer to the wheels. Smg read fine, shifted gears, clutch position changed as needed.

That's a trans out job. At least clutch and likely everything inside the bell housing.

Of course could also be anything downstream the smg. Driveshaft, diff, axles. Forget the computers, get under the car and take a look.

Does bad clutch would rev rev rev without any motion and will give clutch overload or overheat warning? Perhaps a bit more description of his problem is in order but then again, there is an error code related to pressure specifically 4F40 however that could’ve been 600 miles ago error code.

 

[platii]

First, delete all fault and rescan, anything appears again post here.
Second, Do you hear the pump works in the morning, calculate the time till stops?.

 

[PreslavLilov]

Hi, I deleted the faults

and they haven't reappeared. i got under the car to look and there is a leak around those two hoses under the transmission

 

[Boise567]

Hi, I deleted the faults View attachment 972047
and they haven't reappeared. i got under the car to look and there is a leak around those two hoses under the transmission

The leak that you have seen doesn’t tell much unless there is a hint of green fluid otherwise it would be better to clean it and see where the trace of the leak reappear. Have you check to see if there is pressure in the system? This will telll you whatever if your clutch is toasted or there is an internal leak in the hydraulic system.

 

[PreslavLilov]

The leak that you have seen doesn’t tell much unless there is a hint of green fluid otherwise it would be better to clean it and see where the trace of the leak reappear. Have you check to see if there is pressure in the system? This will telll you whatever if your clutch is toasted or there is an internal leak in the hydraulic system.

So can i download ISTA on my windows laptop for free to check the pressure?

 

[Boise567]

So can i download ISTA on my windows laptop for free to check the pressure?

Yes. You need an obd cable of some sort like bimmer geek or ICOM or knockoff China k-can cable off the eBay for it to work.

 

[PreslavLilov]

Yes. You need an obd cable of some sort like bimmer geek or ICOM or knockoff China k-can cable off the eBay for it to work.

Do i need to start the car to check the pressure?

 

[PreslavLilov]

So I checked with my diagnostic. That’s the results.
Pump pressure between 48 and 59 bars
When i start the car or press the brake clutch valve flow value rises to around 1400

 

[PreslavLilov]

So I checked with my diagnostic. That’s the results.
Pump pressure between 48 and 59 bars
When i start the car or press the brake clutch valve flow value rises to around 1400
View attachment 972049
View attachment 972048

When i select gear R or D, value of the gears rises to around 1000

 

[PreslavLilov]

First, delete all fault and rescan, anything appears again post here.
Second, Do you hear the pump works in the morning, calculate the time till stops?.

Now I rescanned and this is the only fault that comes up for the gearbox -
520A SMG Steering Angle is faulty