# Locating ECM **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** cutlass, oldsmobile\ **Created:** [September 9, 2010, 12:19am UTC](https://community.cartalk.com/t/locating-ecm/54849 "2010-09-09T00:19:49Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![anthony112787](https://avatars.discourse-cdn.com/v4/letter/a/f14d63/32.png) [@anthony112787](https://community.cartalk.com/u/anthony112787)\ **Post date:** [September 9, 2010, 12:19am UTC](https://community.cartalk.com/t/locating-ecm/54849/1 "2010-09-09T00:19:49Z")
i am trying to locate the ECM on my car, i have been looking and have asked several people, and everyone has said another location and i have checked them all ---
**Author:** ![BustedKnuckles](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bustedknuckles/32/25_2.png) [@BustedKnuckles](https://community.cartalk.com/u/BustedKnuckles)\ **Post date:** [September 9, 2010, 12:44am UTC](https://community.cartalk.com/t/locating-ecm/54849/2 "2010-09-09T00:44:27Z")
What year Ciera? ---
**Author:** ![jtsanders](https://avatars.discourse-cdn.com/v4/letter/j/c2a13f/32.png) [@jtsanders](https://community.cartalk.com/u/jtsanders)\ **Post date:** [September 9, 2010, 12:44am UTC](https://community.cartalk.com/t/locating-ecm/54849/3 "2010-09-09T00:44:37Z")
What year is your car? You may not have one. ---
**Author:** ![anthony112787](https://avatars.discourse-cdn.com/v4/letter/a/f14d63/32.png) [@anthony112787](https://community.cartalk.com/u/anthony112787)\ **Post date:** [September 9, 2010, 12:46am UTC](https://community.cartalk.com/t/locating-ecm/54849/4 "2010-09-09T00:46:48Z")
it is an 84’ and it does have an ECM ---
**Author:** ![BustedKnuckles](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bustedknuckles/32/25_2.png) [@BustedKnuckles](https://community.cartalk.com/u/BustedKnuckles)\ **Post date:** [September 9, 2010, 12:55am UTC](https://community.cartalk.com/t/locating-ecm/54849/5 "2010-09-09T00:55:30Z")
It either behind the glove box or in the passenger side kick panel, the panel between the fire wall and the door under the dash board. ---
**Author:** ![anthony112787](https://avatars.discourse-cdn.com/v4/letter/a/f14d63/32.png) [@anthony112787](https://community.cartalk.com/u/anthony112787)\ **Post date:** [September 9, 2010, 12:57am UTC](https://community.cartalk.com/t/locating-ecm/54849/6 "2010-09-09T00:57:51Z")
that is waht i have been told as well as under thecarpet on the floor board, i know what it looks like but can’t seem to locate… maybe i need to look again, and open my eyes…lol , thanks for the help ---
**Author:** ![BustedKnuckles](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bustedknuckles/32/25_2.png) [@BustedKnuckles](https://community.cartalk.com/u/BustedKnuckles)\ **Post date:** [September 9, 2010, 1:34am UTC](https://community.cartalk.com/t/locating-ecm/54849/7 "2010-09-09T01:34:50Z")
It is a simple aluminum box with two large wire connectors on one side and a plate cover held with a single screw for access to the PROM chip. It may be in a black plastic sleeve. IIRC, a single bolt holds it in place. You can’t miss the big wire harness running to it. ---
**Author:** ![pleasedodgevan2](https://avatars.discourse-cdn.com/v4/letter/p/ad7895/32.png) [@pleasedodgevan2](https://community.cartalk.com/u/pleasedodgevan2)\ **Post date:** [September 9, 2010, 3:16am UTC](https://community.cartalk.com/t/locating-ecm/54849/8 "2010-09-09T03:16:37Z")
A nice place to put it would be just above the passenger’s right foot where the floor becomes the firewall. Computer–firewall? Sounds kind of familiar. It was located there in a 1985 Cadillac but it could be in the ashtray for all I know. There are Haynes manuals everywhere with computer locations in them.