Change battery affect tune

[CEHollier]

Will changing a battery affect a SCT tuned car. My nephew changed the battery on his tuned 05 Mustang. He said it is shifting at different point now and not driving the same. Any ideas? As far as I know this shouldn't affect the tune.

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[wildcatgoal]

Disconnecting the battery may have reset learned values. If that's the case, it'll eventually advance to where it was before. He may opt to re-flash the tune for good measure.

 

[CEHollier]

The check engine light stays on and it is bucking. ????

 

[wildcatgoal]

Does it idle?

 

[CEHollier]

Yes it idles normally. Having him disconnect the battery for five minutes and reset.

 

[Tommy V]

Changing the battery should not affect the tune in the car in anyway.The kam settings probably.got reset but it should start driving like normal.after about 20 miles of driving.If not check to see what is setting the cel light off.

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