Question

2007 Jeep Liberty V6 with codes 7e8 and 7e9. code lights keep coming on and off, have a new alternator. Though the new alt was the fix, 8 months ago

Answer 1

The codes 7E9 and 7E8 are not OBDII codes. When the OBDII scanner plugs in your vehicle, the OBDII scanner gets the 7E9 and 7E8 ($7E9 and $7E8) codes from the ECM. The codes are a menu of systems that the OBDII scanner can access. OBDII scanner interprets the codes and displays the menu. Some scanners can't solve these codes and show the codes instead of the interpretation. Clicking on the code menu will read the OBDII codes (e.g. P0420 or P0455), if any, from that system.

Menu Code 7E8 ($7E8): Engine System

Menu Code 7E9 ($7E9): Transmission System

Menu Code 7EA ($7EA): Engine Management

Answer 2

7E8 and 7E9 are control module menu

 

Here a scan tool is plugged into the OBDII port, the menu comes on the screen one is for the engine control module, the other is for the transmission control module, 7E8 and 7E9 are just menus for the control module