Lack of ECU code?

[Red17]

So I just submitted my custom tune request to Lund and had to find the ECU code for the form. I was told by the tooltip that some cars may not have a four digit ECU code and mine lacks one. Why is it that some cars don't have these codes?

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[Jay-rod427]

Mine doesn't have one and I had to give them the full serial number off of the pcm.

 

[stang1971]

i talked to Lund about that when i got my tune. He said the way he tunes, the code isnt needed on the 17's Ive had no issues with his tune and i have almost 12k on the car.

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