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P1621 Chevrolet -

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Does this mean something is going out of my truck with this code?

Vehicle: 2004 duramax 6.6lly

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P1621 ECM not programmed

Is there any chip or tuner applied to the ECM? what this code means is the ECM is not programed.

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P1621 Chevrolet -Silverado 1500 4.3
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