# 1998 Cadillac Seville P0603 code

**URL:** <https://community.cartalk.com/t/1998-cadillac-seville-p0603-code/114780>\
**Category:** Maintenance/Repairs\
**Tags:** cadillac, seville\
**Created:** [March 31, 2018, 7:14pm UTC](https://community.cartalk.com/t/1998-cadillac-seville-p0603-code/114780 "2018-03-31T19:14:02Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Tom00](https://avatars.discourse-cdn.com/v4/letter/t/c67d28/32.png) [@Tom00](https://community.cartalk.com/u/Tom00)\
**Post date:** [March 31, 2018, 7:14pm UTC](https://community.cartalk.com/t/1998-cadillac-seville-p0603-code/114780/1 "2018-03-31T19:14:03Z")

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P0603 code on ‘98 siville sts. Getting lots of codes, any thoughts on easy fix?

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**Author:** ![BillRussell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/billrussell/32/3179_2.png) [@BillRussell](https://community.cartalk.com/u/BillRussell)\
**Post date:** [March 31, 2018, 10:12pm UTC](https://community.cartalk.com/t/1998-cadillac-seville-p0603-code/114780/2 "2018-03-31T22:12:31Z")

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I find this online

P0603 CADILLAC - Control Module Long Term Memory Reset Possible causes  
Loose or poor battery terminal connection  
Low battery charge  
Engine Control Module (ECM) / Powertrain Control Module (PCM) power supply circuit is open or shorted  
ECM/PCM Programing  
Faulty ECM/PCM

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**Author:** ![the\_same\_mountainbike](https://avatars.discourse-cdn.com/v4/letter/t/c89c15/32.png) [@the\_same\_mountainbike](https://community.cartalk.com/u/the_same_mountainbike)\
**Post date:** [March 31, 2018, 10:18pm UTC](https://community.cartalk.com/t/1998-cadillac-seville-p0603-code/114780/3 "2018-03-31T22:18:35Z")

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> [@Tom00](#):
>
> Getting lots of codes

What other codes are you getting?

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [March 31, 2018, 10:22pm UTC](https://community.cartalk.com/t/1998-cadillac-seville-p0603-code/114780/4 "2018-03-31T22:22:49Z")

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Diagnostic Trouble Code P0603 is usually caused by a bad ECU.

[https://www.troublecodes.net/pcodes/p0603/](https://www.troublecodes.net/pcodes/p0603/)

Tester