Does a dead battery "drop out" OBD codes??
Thread Starter
5th Gear
Joined: Sep 2011
Posts: 5
Likes: 0
Does a dead battery "drop out" OBD codes??
Thanks to those who sent answers to my problem, yesterday.
However I have discovered that the battery is completely DEAD!!
When I replace it will the diagnostic codes, telling me what mechanical problems caused the car to stop running, be there or were they dropped, never to be retrieved again????
However I have discovered that the battery is completely DEAD!!
When I replace it will the diagnostic codes, telling me what mechanical problems caused the car to stop running, be there or were they dropped, never to be retrieved again????
Safety Car
Joined: Jun 2006
Posts: 3,629
Likes: 28
From: FL
Thanks to those who sent answers to my problem, yesterday.
However I have discovered that the battery is completely DEAD!!
When I replace it will the diagnostic codes, telling me what mechanical problems caused the car to stop running, be there or were they dropped, never to be retrieved again????
However I have discovered that the battery is completely DEAD!!
When I replace it will the diagnostic codes, telling me what mechanical problems caused the car to stop running, be there or were they dropped, never to be retrieved again????
Team Owner
Joined: Dec 1999
Posts: 34,873
Likes: 487
From: Lacey WA RVN 68-69
NCM Sinkhole Donor
Some codes that are saved in the ECM as history codes may go away. But some codes will remain. What is the current voltage reading at the battery right now?
There are battery backups that connect to the ALDL that will provide enough voltage to the ECM that disconnecting the battery will not cause erasure of stored codes. Is there an AutoZone parts store in your area? They have rental tools and they may have a backup tool. The rental is "free" in that you simply pay a deposit and when you return the tool, you get your deposit back.
Parts stores may also have a small plug-in device that goes into the cigarette lighter and uses a 9V battery. That will be enough to provide power to the ECM while the battery is being changed out.
There are battery backups that connect to the ALDL that will provide enough voltage to the ECM that disconnecting the battery will not cause erasure of stored codes. Is there an AutoZone parts store in your area? They have rental tools and they may have a backup tool. The rental is "free" in that you simply pay a deposit and when you return the tool, you get your deposit back.
Parts stores may also have a small plug-in device that goes into the cigarette lighter and uses a 9V battery. That will be enough to provide power to the ECM while the battery is being changed out.
Advanced
Joined: Mar 2014
Posts: 69
Likes: 29
From: Kennesaw GA
Some codes that are saved in the ECM as history codes may go away. But some codes will remain. What is the current voltage reading at the battery right now?
There are battery backups that connect to the ALDL that will provide enough voltage to the ECM that disconnecting the battery will not cause erasure of stored codes. Is there an AutoZone parts store in your area? They have rental tools and they may have a backup tool. The rental is "free" in that you simply pay a deposit and when you return the tool, you get your deposit back.
Parts stores may also have a small plug-in device that goes into the cigarette lighter and uses a 9V battery. That will be enough to provide power to the ECM while the battery is being changed out.
There are battery backups that connect to the ALDL that will provide enough voltage to the ECM that disconnecting the battery will not cause erasure of stored codes. Is there an AutoZone parts store in your area? They have rental tools and they may have a backup tool. The rental is "free" in that you simply pay a deposit and when you return the tool, you get your deposit back.
Parts stores may also have a small plug-in device that goes into the cigarette lighter and uses a 9V battery. That will be enough to provide power to the ECM while the battery is being changed out.
