I had dead batteries on my truck and got them fully charged with a charger. Well today, I went out and started it and the parking brake light and the ABS light would not go out. I put the Smarty on it to check for codes and got a P2509 which is POWERDOWN DATA LOST ERROR. Do any of you know exactly what this is? I cleared the code and restarted the truck and the lights didn't stay on this time. I didn't drive the truck, but she was purring like a kitten. -

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Mike

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IIRC it just means that the computer ran out of power. Did you have to reset anything on the radio also? -

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Service manual was in Greek!! Just like 06DIESEL said, in a simple way!! Was insufficient voltage to retain the memory in the ECM. -

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Yep, I lost all presets and time. That would make sense though, it took almost 48 hours to charge both batteries. -

Saved an alternator also. -

I didn't even think about that, but you are correct. -