2005 GEM battery display on dash always shows single red line

[diymatt]

YEp. @Inwo linked to that. Worked perfect. Thank you both.

@Inwo

Turn the key on.
Push and release the TRIP/ODOMETER switch until it’s showing the
odometer.
While holding the switch down, turn the RIGHT signal on, then the LEFT
signal, then return the blinker to the center.
Release the TRIP/ODOMETER switch. You should be seeing data (P0105) on
the display now.
Turn the RIGHT signal on, then off repeatedly until the display reads:
SOC (State Of Charge).
Push and release the TRIP/ODOMETER switch. Now it’s remaining capacity in
percent.
You can now raise (or lower, for that matter) the SOC with the blinker
switch.
When you’re happy, Push and release the TRIP/ODOMETER switch. The display
reads: DONE.
Turn the key off.