What does a PO62F EEPROM Error mean in a 2012 Impala LTZ mean?

Question edited for clarity, and correct order of information and toss in a few CAPS where needed.
Question moved to model category.

All Impala are the same, only difference is bore and stroke for the extra capacity.

https://www.google.com/search?q=2008+chevy+impala+3.5+serpentine+belt+diagram

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Whenever the ignition is on and the PCM is energized, EEPROM self-tests are initiated. In addition to running internal controller self-tests, the controller area network (CAN) also compares signals from each individual module to ensure that each controller is functioning properly. These tests are performed simultaneously. If the PCM detects discrepancies in EEPROM functionality, a code P062F will be stored and a malfunction indicator lamp (MIL) may be illuminated. Additionally, if the PCM detects a problem between any of the on-board controllers, which would indicate an internal EEPROM error, a code P062F will be stored and a malfunction indicator lamp (MIL) may be illuminated. Multiple failure cycles may be necessary for MIL illumination, depending upon the perceived severity of the malfunction.
Causes for this P062F DTC code may include:
Defective controller or programming error, Overheated PCM, Water damage, A bad controller power relay or blown fuse, Open or shorted circuit or connectors in the CAN harness Insufficient control module ground Faulty EEPROM.

its on the drivers side of the engine right above the transmission bell housing.




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Engine light on ,any DTC'S diagnostic trouble code's stored ? Have the EVAP system smoke tested .

take it to a chevy dealership, you have an internal problem with the radio. or you can just yank it out and replace it with an after market radio.

TYPE: OBD PO496

new battery and if the car sits for a day the battery is dead

Need to have a code, running rich could mean a lots of things, temp sensor, o2 sensor, fuel pressure to high, get the code and come back, if the mechanic wont give you the code for free, go to auto zone in your area, free code riding.

t is most likley a disconnected wire underneath the shifter / shifting column. Had my 2010 Impala LTZ for three weeks and it happened,had it towed tot he dealer they said they don't know why it cam loose but replaced the connector and tpaed it up tight with electrical tape.

This usually happens with older cars with lots of miles, so they say but ive been driving for over 20 years andhave hadc old old cars and new ones and this NEVER happened Good Luck.

p0128 is coolant temperature sensor below range, change sensor. p0604 is pcm random access mem ( ram error. it may mean the pcm has failed, have it checked out..