Transmission Program Error
There was a "Transmission Program Error" on the dash indicator. The error went away, and returned. Accompanying the error, the car would not travel forward. The error went away, the car drove. I consulted BMW about this; they said it was okay to drive if the car was capable of operating, particularly to get the car to a service center.
I conveyed if there was a transmission problem and it had to be replaced, I want to consider a used transmission. If this was not available, a rebuild transmission is desirable. They had no transmission personnel (they said).
Below is the order of troubleshooting and replacement:
Replacement Order A: (Actual)
1. EPROM
2. AT-Getriebe (transmission)
3. AT-Co unit
Note: A cable was also tested in the above procedure, but I was charged for the items cited above. The car did not resume normal transmission operation until the transmission control unit was replaced (item 3 above).
I preferred the order below, due to the indicated error and the cost of each part to the customer.
Replacement Order B: (Desired)
1. EPROM
2. AT-Co unit
3. AT-Getriebe (transmission)
I've been taught to replace from the lowest/smallest replaceable unit to the highest/larger.
Questions:
Does my rationale make sense or am I missing something?
What is the life expectancy of a transmission under normal condition, and low mileage for the car age?
Below is some other information if you have further questions:
I am not a car expert; I just know how my car responds under operating conditions (like my right arm). The car was garage kept and stored since 1997, with limited driving and regular services. Prior to submitting the car to the service center for the first service in Korea; the car performed well. It had approximately 66,000 at the time. Now the mileage is 86,000, 10 years later with regular services. They car has was never the same after the first service. Just like I know my right arm.