negative response code

i have changed a 2008 roush supercharged mustang from automatic to manual mechanically it is sound but have an issue with the tune. i have changed the pcm and purchased a new engine harness. as the orginal tune was for the auto i soursed a manual tune which i have tried to write to the pcm but evertime i try i get the following message "write transfer request x7 negative response code. can anyone give any advice or herlp please on what this message actually means and what i can do. many thanks in advance
mike

Someone on this board should know. In the meantime create a support ticket to HP Tuners and see what they say.

This is typically a battery/low voltage issue.

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Originally Posted by charcoal03silvy

This is typically a battery/low voltage issue.

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many thanks for your reply i will check the battery and sure hope this is the issue

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Originally Posted by SHMUSTANG

i have changed a 2008 roush supercharged mustang from automatic to manual mechanically it is sound but have an issue with the tune. i have changed the pcm and purchased a new engine harness. as the orginal tune was for the auto i soursed a manual tune which i have tried to write to the pcm but evertime i try i get the following message "write transfer request x7 negative response code. can anyone give any advice or herlp please on what this message actually means and what i can do. many thanks in advance
mike

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Automatic PCM can be switched to Manual with no problem - you don't need a second ECU. The other way around is a different story.

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Originally Posted by veeefour

Automatic PCM can be switched to Manual with no problem - you don't need a second ECU. The other way around is a different story.

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many thanks the only reason i changed the pcm as i was told by a tech at ford i would need to change the pcm and the harness, i look through the file and noticed that i could switch the auto off. unfortunately i still have the issue after making sure the battery was fully charged

Have you identify the pcm to vin #?

yes i have identified the pcm to the vin as i could change things in the tune file. when i installed the new engine harness that is when the problems started