Notes On Intermittents
The vehicle must be driven for 30 seconds in test conditions for code "EO39" to occur. This may necessitate an extended test drive of at least 15 minutes of operation at above 25 MPH.
If customer complaint indicates that code occurs after an extended drive, check for signs of transmission overheating.
Transmission sump oil temperatures in excess of 315°F (157°C) will cause transmission over-temperature switch to open the VCC solenoid circuit and disable VCC.