dead battery loses tune????? - ModernCamaro.com - 5th Generation Camaro Enthusiasts
Diagnostics & Tuning Diagnostics | Programming | Tuning

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post #1 of 16 Old 05-03-2010, 05:43 AM Thread Starter
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dead battery loses tune?????

had my car tuned after my cam was installed. just spoke to one of my buddies the other day and he told me that if my car were to ever DIE(battery), that i would lose my tune that was programmed into the computer. is this true? i had my 99 trans am tuned after putting a supercharger on it and the battery died before. but i never lost any tune and no codes came up. so is this true? and if so, what can i do to make sure i dont lose the tune?

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post #2 of 16 Old 05-03-2010, 06:10 AM
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I would doubt that is the case. If that were the case, then whatever "stock tune" GM installs would no doubtedly be wiped out as well causing you to have to take a trip to the dealer after reinstalling the battery. I would think the PCM memory is more like a hard drive or non-volatile memory meaning if it loses power, it doesn't lose what's stored on it. Again, I'm not the expert but losing the tune changing out your battery doesn't make sense IMO.
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post #3 of 16 Old 05-03-2010, 06:16 AM
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You won't lose the tune if the battery dies! The tune is flashed into a non-volitale section of memory. This means it is not dependent on the battery to maintain the data stored. However Fuel trims are volitale and the car will have to re-learn fuel and spark adaptations as well as trans shift tables. (for an automatic)
So, the car may run a little funky until it learns and smooths itself out.
But, you might not even notice in some cases.
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post #4 of 16 Old 05-03-2010, 08:33 AM
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you won't lose the tune.

say you had a laptop with a bunch of stuff saved on it. if the battery dies and you replace the battery, you wouldn't lose everything that is saved on it.

samething goes with the car's computer. the only way to lose the tune is to save a different one over it.

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post #5 of 16 Old 05-03-2010, 09:14 AM Thread Starter
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Quote:
Originally Posted by RedJewel2SS View Post
you won't lose the tune.

say you had a laptop with a bunch of stuff saved on it. if the battery dies and you replace the battery, you wouldn't lose everything that is saved on it.

samething goes with the car's computer. the only way to lose the tune is to save a different one over it.
there are cars that will lose a tune after the battery dies. i dont know if its the tune shop or if its just the type of car. but im glad i dont have to worry about this. i have had more than 1 friend tell me this. got me a little scared. but if its good, then im fine.

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post #6 of 16 Old 05-03-2010, 09:53 AM
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probably only happens to dodges and fords

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post #7 of 16 Old 05-03-2010, 09:54 AM
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Negative.

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post #8 of 16 Old 05-03-2010, 01:44 PM
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Quote:
Originally Posted by 2010_5thgen View Post
had my car tuned after my cam was installed. just spoke to one of my buddies the other day and he told me that if my car were to ever DIE(battery), that i would lose my tune that was programmed into the computer. is this true? i had my 99 trans am tuned after putting a supercharger on it and the battery died before. but i never lost any tune and no codes came up. so is this true? and if so, what can i do to make sure i dont lose the tune?
Not true. I had to ground my battery leads (disconnect from battery terminals, touch together) to get the car to start up right after my tune. Needless to say, I did not lose my tune.

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post #9 of 16 Old 05-04-2010, 02:06 AM
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It'd be like a flash drive losing all of its data once you pull it out of the USB port.



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post #10 of 16 Old 05-04-2010, 05:38 AM Thread Starter
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well thanks for the information. ill let my buddies know that their retarded.......if they dont know already.

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