# BAT light puzzle **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** chrysler, concorde\ **Created:** [September 19, 2013, 5:25am UTC](https://community.cartalk.com/t/bat-light-puzzle/81404 "2013-09-19T05:25:35Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![Francizek](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/francizek/32/303_2.png) [@Francizek](https://community.cartalk.com/u/Francizek)\ **Post date:** [September 19, 2013, 5:25am UTC](https://community.cartalk.com/t/bat-light-puzzle/81404/1 "2013-09-19T05:25:35Z")
2004 Concord, 2.7, 145K. BAT light comes on when decelerating from 3000 rpm (as when passing another car). Stays on until engine is turned off for a few seconds and restarted. Alternator replaced, condition continues. Volt and amps repain in spec whether BAT light is on or off. Does anyone have a clue? ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [September 19, 2013, 7:52am UTC](https://community.cartalk.com/t/bat-light-puzzle/81404/2 "2013-09-19T07:52:00Z")
Sometimes the battery light will come on if there is a problem with the brake system. Good idea to have the brakes looked at. ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [September 19, 2013, 8:12am UTC](https://community.cartalk.com/t/bat-light-puzzle/81404/3 "2013-09-19T08:12:55Z")
Check the Powertrain control module for fault codes. That light inidates the PCM detected a problem with the charging system or ambient temperatue sensor. ---
**Author:** ![Francizek](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/francizek/32/303_2.png) [@Francizek](https://community.cartalk.com/u/Francizek)\ **Post date:** [September 19, 2013, 3:42pm UTC](https://community.cartalk.com/t/bat-light-puzzle/81404/4 "2013-09-19T15:42:22Z")
Thanks for the suggestion Nevada. That was my thought as well. I’ll post back whenever I have a chance to have the dealer check the PCM. ---
**Author:** ![Cougar](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cougar/32/21348_2.png) [@Cougar](https://community.cartalk.com/u/Cougar)\ **Post date:** [September 19, 2013, 10:52pm UTC](https://community.cartalk.com/t/bat-light-puzzle/81404/5 "2013-09-19T22:52:43Z")
I think the PCM also controls the alternator so the PCM or connection to it may be causing the problem.