Anti-theft, ABS, Traction control lights are on

1999 CADILLAC DEVILLE
104,000 MILES • 4.6L • V8
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MROULET1
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Rings appear around all my gears on my dash and start flashing with my fuel rang looking like - - - then saying the the rang again. While saying may not restart. On top of the ABS light coming on and the traction control light. The ABS light only come on when the anti-theft light stuff happen. It still started up, but I changed the key out it went away for a little then came back on saying and doing the same thing. now my battery went dead. It still starts up. I’m thinking about changing out the ignition cylinder?
Aug 23, 2019 at 9:01 PM
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ASEMASTER6371
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Good morning,

The first thing I would do is to charge the battery back to 12.6 volts.

https://www.2carpros.com/articles/how-to-charge-your-car-battery

Then check the charging system to be sure the alternator is working.

https://www.2carpros.com/articles/how-to-check-a-car-alternator

This would explain a lot of the issues. Low voltage will cause all kinds of issues as the modules cannot function without the correct voltage.

Roy
Aug 24, 2019 at 6:08 AM
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MROULET1
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I just replaced the alternator a month ago. I’m replacing the battery today. If I still have the same problem what should I do next?

Another thing is, i have to turn the key over once or twice before it turns over. After starting as long as it don’t sit for a long time it will fire right up. Also have a lean code bank 1 and 2.
Aug 24, 2019 at 7:11 AM
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ASEMASTER6371
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What are the codes?

Replace the battery and check the voltage at the battery with the engine running.

Roy
Aug 24, 2019 at 7:17 AM
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MROULET1
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Codes are po171 and po174. Some research says it’s a vacuum leak or mass air flow sensor.
Aug 24, 2019 at 7:30 AM
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ASEMASTER6371
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Okay, thanks.

I would check the fuel pressure. That is a common cause for the code.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Yes, it could be a vacuum leak. You need a scan tool to monitor the long term trims.

Roy
Aug 24, 2019 at 7:55 AM
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MROULET1
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How do I check the fuel pressure? I did press the value and gas’s shot out. Fuel pump replaced a month ago as well. It was having the issue before hand.
Aug 24, 2019 at 12:36 PM
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ASEMASTER6371
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I sent you a guide for checking the pressure. You need a gauge as the needed pressure is very specific.

Roy
Aug 24, 2019 at 12:40 PM
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MROULET1
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So I replaced my battery and alternator tested good and my anti theft is still on and doing the same thing I said before.
Aug 24, 2019 at 6:11 PM
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ASEMASTER6371
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You may be right about the lock cylinder it is common for the 2 wire to fail and cause this issue.

Roy
Aug 24, 2019 at 6:18 PM
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MROULET1
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Is it common for the car to still start? So like a warning that it’s going out.
Aug 24, 2019 at 6:22 PM
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ASEMASTER6371
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If the wires are broken, no, it will not start. If they are frayed, yes, it will be intermittent.

As far as the fuel pump, yes, that would cause it to start intermittently.

Roy
Aug 25, 2019 at 4:10 AM
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MROULET1
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Another question my A/C will be blowing good then slow down and stop feeling cold.
Aug 26, 2019 at 4:08 PM
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ASEMASTER6371
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Okay, by site rules, I can only deal with one issue at a time.

Please send a new question and I will be glad to assist with the A/C issue.

Roy
Aug 26, 2019 at 4:13 PM
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MROULET1
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My anti theft light came on all yesterday. Now that I have the new parts it haven’t came on one time?
Aug 27, 2019 at 9:06 AM
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ASEMASTER6371
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Good deal. Let us hope it stays off.

Roy
Aug 27, 2019 at 9:12 AM
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MROULET1
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Well I have yet to put the new parts in.
Aug 27, 2019 at 9:31 AM
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MROULET1
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Someone also told me that it can just very well just be the key is bad. But both keys being bad?
Aug 27, 2019 at 9:32 AM
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ASEMASTER6371
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No, not at all. I do not agree with that assessment.

I would replace the lock cylinder.

Roy
Aug 27, 2019 at 12:45 PM
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MROULET1
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Okay, will do tomorrow and will let you know how it goes.
Aug 27, 2019 at 1:42 PM
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ASEMASTER6371
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Sounds like a plan.

Keep me updated.

Roy
Aug 27, 2019 at 1:44 PM
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MROULET1
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So far, so good.
Aug 28, 2019 at 7:39 PM
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ASEMASTER6371
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Good deal.

Roy
Aug 28, 2019 at 9:07 PM
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MROULET1
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How do I ask a new question and you the one to still help?
Aug 29, 2019 at 11:24 AM
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ASEMASTER6371
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Just start a new question and add my name to the question.

Roy
Aug 30, 2019 at 4:33 AM
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MROULET1
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So the light just came back on. Now what?
Aug 31, 2019 at 7:54 AM
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ASEMASTER6371
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The lock cylinder that we discussed way back.

Roy
Aug 31, 2019 at 7:56 AM
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MROULET1
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I replaced the cylinder with new key on Wednesday. The light was off until this morning it came back on saying the same message about the anti theft. Traction control light came on as it was when it happens.
Aug 31, 2019 at 2:28 PM
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ASEMASTER6371
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Do you have a scan tool that can read the anti-theft system? That is the next step to see what the failure is for this system.

Roy
Aug 31, 2019 at 2:55 PM
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MROULET1
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No I don’t have one. Ugh!!! I’m just going to have to take it in at this point. What’s the chance that I have to flash the computer?
Aug 31, 2019 at 4:28 PM
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ASEMASTER6371
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Not likely at all.

You need a shop that can monitor the system. A dealer would be my last choice.

Roy
Aug 31, 2019 at 4:32 PM
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MROULET1
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I’m new to the area I’m in so I don’t trust anyone. The dealer is the only place.
Aug 31, 2019 at 6:39 PM
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ASEMASTER6371
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I would not trust them as they are very high price and sell items that you do not always need.

Your call.

Roy
Aug 31, 2019 at 7:02 PM
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MROULET1
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Hey, I ran that self scan the car do. I got 39 code so I took it in they found a loose grown. Fix that! Reset some codes. Have to take it in for the others, but what we was working on is fix!! Thank you!!
Sep 30, 2019 at 10:11 PM
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ASEMASTER6371
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You are welcome.

Roy
Oct 1, 2019 at 2:14 AM