# Resetting 2003 cadillac computer

**URL:** <https://community.cartalk.com/t/resetting-2003-cadillac-computer/159981>\
**Category:** Maintenance/Repairs\
**Tags:** electrical-wiring\
**Created:** [February 29, 2020, 7:01pm UTC](https://community.cartalk.com/t/resetting-2003-cadillac-computer/159981 "2020-02-29T19:01:20Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![ranch7](https://avatars.discourse-cdn.com/v4/letter/r/d9b06d/32.png) [@ranch7](https://community.cartalk.com/u/ranch7)\
**Post date:** [February 29, 2020, 7:01pm UTC](https://community.cartalk.com/t/resetting-2003-cadillac-computer/159981/1 "2020-02-29T19:01:20Z")

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I recently had a lot of work done to my 2003 Cadillac DeVille and under the hood is almost like new. The last work I had done was a head gasket job. Afterwards, I couldn’t get my computer codes erased and my retired mechanic neighbor, who did the work, couldn’t and/or didn’t have the equipment. The “ABS-Brakes-Traction Control” lights are on as well as the “Check Engine Soon” light underneath those. Also, on my information screen I have such messages as “check gas cap,” “check brake fluid,” “check coolant level.”

My car has the PCM (powertrain control module) located under the air filter. I’ve tried a few things to remove the codes that I’ve read online, but nothing has worked. I haven’t messed with the PCM yet.

Anyone have any suggestions as to how I might be able to clear out the computer on my Cadillac?

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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:** [February 29, 2020, 7:24pm UTC](https://community.cartalk.com/t/resetting-2003-cadillac-computer/159981/2 "2020-02-29T19:24:40Z")

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[https://www.aa1car.com/library/battery\_disconnect\_problems.htm](https://www.aa1car.com/library/battery_disconnect_problems.htm)

Tester

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<div class="post-metadata">

**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\
**Post date:** [February 29, 2020, 8:22pm UTC](https://community.cartalk.com/t/resetting-2003-cadillac-computer/159981/3 "2020-02-29T20:22:03Z")

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I don’t mean to disparage your neighbor/retired mechanic . . .

But have you considered that the codes are legitimate . . . in other words, have you considered the possibility that all these various codes are present because the guy made some kind of mistake(s) during the course of the repair(s)

> [@ranch7](#):
>
> I’ve tried a few things to remove the codes that I’ve read online, but nothing has worked.

Can you please elaborate?

Did you use a scanner and/or code reader?

Also . . . do you even know which specific codes you have?

Or do you merely know which warning lights are on and haven’t been able to go further than that?

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<div class="post-metadata">

**Author:** ![ranch7](https://avatars.discourse-cdn.com/v4/letter/r/d9b06d/32.png) [@ranch7](https://community.cartalk.com/u/ranch7)\
**Post date:** [March 2, 2020, 6:22pm UTC](https://community.cartalk.com/t/resetting-2003-cadillac-computer/159981/4 "2020-03-02T18:22:25Z")

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Thank you for your email.

My neighbor was a working mechanic in Los Angeles for 30 something years in a shop he owned with his brother. My car is running excellent since the recent mechanical work. I did have Autozone use their little scanning tool and various codes came back: P0741, P0440, P1860.

![](https://global.discourse-cdn.com/cartalk/original/2X/6/602d295699c664ee41f5e74eb1e2b9d202636f1e.png)

![](https://global.discourse-cdn.com/cartalk/original/3X/0/6/06b240fa4d2b444ceb66530b7436d74e9df0403e.jpeg "db4690")  
[db4690](https://community.cartalk.com/u/db4690)

```
    February 29

```

I don’t mean to disparage your neighbor/retired mechanic . . .

But have you considered that the codes are legitimate . . . in other words, have you considered the possibility that all these various codes are present because the guy made some kind of mistake(s) during the course of the repair(s)

> ![](https://global.discourse-cdn.com/cartalk/original/3X/d/e/de760e46749e15cf32b0563f643e531d1145eb77.png) ranch7:  
> I’ve tried a few things to remove the codes that I’ve read online, but nothing has worked.

Can you please elaborate?

Did you use a scanner and/or code reader?

Also . . . do you even know which specific codes you have?

Or do you merely know which warning lights are on and haven’t been able to go further than that?