My 2006 MT, 93000, original battery, was working fine until stored for 3 months in Maine winter. When the snow receded, 12V battery was discharged, so I disconnected and trickle charged it. It started on 12V starter. SOC showed no bars, but after a few minutes running, came up to 3 bars. Following starts on IMA. On the road, everything normal for about 5 miles, then SOC went to "full charge" for about a minute, then IMA light came on, with check engine light. SOC went to 1 bar, assist and charge not working. Unchanged the rest of 50 mile trip. OBDII readout showed code P0070 (supposed to indicate a generic Ambient Air Temperature Sensor Circuit). The blink code is 69, which I can't find in the shop manual. It still starts on IMA, but check engine light is on, as well as the IMA light. Can anyone interpret this situation for me?