DTC P0605: Internal Control Module Read Only Memory (ROM) Error

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2011 Mercury Milan, 2011 Mercury Mariner, 2011 Mercury Grand Marquis, 2011 Lincoln Town Car, and 2011 Lincoln Navigator L. However, it is still accessible from the selected car via links, so may be relevant.

P0605 - INTERNAL CONTROL MODULE READ ONLY MEMORY (ROM) ERROR

Description:	The powertrain control module (PCM) ROM has been corrupted.
Possible Causes:	An attempt was made to change the calibration Module programming error Aftermarket performance products PCM
Diagnostic Aids:	Reprogram the vehicle identification (VID) block (use as built data). Check for other DTCs or drive symptoms for further action. Check for aftermarket performance products before installing a new PCM. If it is necessary to install a new PCM, refer to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) , Programming the (VID) Block for a Replacement PCM.
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
All	Refer to the Description, Possible Causes and Diagnostic Aids for the DTC in table.