4.1.3 Electrically Erasable Programmable Read Only Memory Test Error - P1605

During initialization and operation, the background diagnostics run a checksum on the data in the EEPROM. If a fault is already logged then a complete checksum will be performed during initialization. When a checksum error is detected the TCM will adopt the default mode (limp home) and flag the failure.

If the failure is permanently flagged, the TCM should be replaced taking care to obtain the correctly programmed variant.