4T45-E Automatic Transaxle
DTC P062F
Circuit Description
While the vehicle is being driven, engine and transmission data accumulates in a random access memory (RAM) device, which cannot store data reliably when the transmission control module (TCM) powers down. Before the TCM powers down, the data is copied from RAM to an electrically-erasable programmable read-only memory (EEPROM) device, sometime referred to as non-volatile memory (NVM). Both the RAM and the EEPROM are inside the TCM. A normal function of the TCM programming is to test the EEPROM at TCM power-down by copying test data from RAM to the EEPROM and then comparing the two copies. If they do not match, DTC P062F will set. DTC P062F is a type A DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P062F Internal Control Module EEPROM Error
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
The TCM detects a checksum error when the RAM and EEPROM test data are compared.
Action Taken When the DTC Sets
* The TCM requests the ECM to illuminate the malfunction indicator lamp (MIL) when the Conditions for Setting the DTC are met.
* The TCM commands a soft landing to 2nd gear.
* The TCM commands maximum line pressure.
* The TCM forces the TCC OFF.
* The TCM inhibits TCC engagement.
* The TCM freezes transmission adaptive functions.
* At the time of the first failure, the ECM records the operating conditions when the Conditions for Setting the DTC are met. The ECM stores this information as a Freeze Frame.
* The TCM stores DTC PP062F in TCM history.
Conditions for Clearing the DTC
* The ECM turns OFF the MIL after the third consecutive drive trip in which the TCM does not send a MIL illumination request.
* A scan tool can clear the DTC.
* The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without a non emission related diagnostic fault occurring.
* The TCM cancels the DTC default actions when the ignition is OFF long enough in order to power down the TCM.
Diagnostic Aids
TCM reprogramming may cause DTC P062F to set.
Test Description
The number below refers to the step number on the diagnostic table.
2. Performing this step helps verify that an external anomaly, such as Electromagnetic Interference (EMI), did not cause the code to set originally.
