History codes keep coming back?
Thread Starter
Burning Brakes
Joined: Mar 2002
Posts: 1,003
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From: San Diego CA
History codes keep coming back?
I've had codes in the past that have gotten fixed but every now and then the check engine light appears and when i go through the codes they all have an H next to them so i'm assuming that means history.
Why do these keep popping up after i clear them out?
Thanks in advance,
Frank
Why do these keep popping up after i clear them out?
Thanks in advance,
Frank
Team Owner
Joined: Apr 2001
Posts: 36,453
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From: Overwhelmed as one would be, placed in my position.... DFW, TX
St. Jude Donor '05
Tech Contributor
Joined: Dec 1999
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
You need to post the codes that keep coming back. Some of them happen when you have a weak battery. (Battery will start the car but voltage gets low enough to cause certain modules to set codes). As soon as the voltage geta above the threashold of low voltage the code goes to HISTORY 
Use a volt meter and measure across the pos and neg battery terminals. When the car is cold have someone starts the car see how low the voltage goes as the engine cranks. It should not drop below 11 volts.
If the car sits for long periods of time between uses the battery could be good but just needs to be charged prior to use.
Let us know how you make out
BC
Use a volt meter and measure across the pos and neg battery terminals. When the car is cold have someone starts the car see how low the voltage goes as the engine cranks. It should not drop below 11 volts.
If the car sits for long periods of time between uses the battery could be good but just needs to be charged prior to use.
Let us know how you make out
BC
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Melting Slicks
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From: New Orleans La.
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St. Jude Donor '03-'04-'05-'06
Originally Posted by SFVetteman
Also keep in mind that for your convience and amusement, Gm has made it so that some codes that indicate they are history are really current 
