991.2/718 ECU Flash Guide

How COBB's ECU Flash Process Works


How It Works:

  1. When you purchase an Accessport off of our website or dealer portal, a trigger in our system send a note to our warehouse and fulfillment team.

  2. Once there our shipping team sends out a nondescript box via UPS 2-Day Air.  This box shows up inside of a protective outer box to ensure your packaging arrives safely.  Inside of the box is packing material to protect your ECU.

  3. Once you've received the box it's time to remove your ECU.  Check out our website for instructions on how to remove the unit from your car. 

  4. With your ECU removed from the car, add it into the provided static free bag with the connector towards the inside.


  5. After folding over the top of the bag, Put the ECU in the lower foam piece with the flat side of the ECU Down.

  6. Now go ahead and put in the upper foam piece with a cutout for the Accessport.

  7. With everything in place, seal up the box and drop it off at your nearest UPS location.  The label should already come pre-attached to the top of the box.  Should it be damaged in any way alert our customer support team and we can get you a replacement.

  8. Once it arrives here with our friendly receiving team, they'll bring it over to our repair room.

  9. When our repair technician receives the ECU he'll send out an email notifying you that the ECU has been received so that you know it has arrived here safely.

  10. At this point we take the unit over to our purpose-built machine designed to pull the entire cover of the ECU off.

  11. With the cover removed it goes into our special process in order to enable the Accessport to be installed on it.  After which we test everything to ensure proper operation.

  12. Once done we reseal the ECU with sealant and clamp the lid back down to keep out any kind of dirt or moisture.

  13. Now it will get placed into it's packaging and shipped out to you along with the Accessport.


Frequently Asked Questions

Q. Why don't you Install the Accessport before sending it out to me so I don't have to do it when it gets here?

A.There are a few different reasons for that.  One reason is that we don't immediately know what map you want to flash, whether your car is stage 1, 2 or should really be on a custom tune.  Another reason is that while we do testing here to make sure everything works, we only really see what is going on with the ECU itself.  In order to make sure everything is working properly on the rest of the vehicle we need to do the flashing on the car.  This is important since you could potentially get stuck on an incorrect map or something on your car (aftermarket electronics or damaged wiring) could block communication with the Accessport, and we'd rather find those things out as soon as possible.

Q. What happens if the ECU arrives damaged?

A. If there is physical damage to the packaging or ECU when it arrives either at COBB Headquarters or at your front door our first step is to let you know, likewise your first step should be to get in touch with us.  Each of the packages are insured through UPS and we promise to do everything in our power to get you going again as soon as possible.

Q. What happens if it can't be programmed?

A. While rare, in some instances the ECU may not be physically damaged but may be defective enough that we are unable to flash it.  If for any reason we are unable to perform the backdooring process we'll reach out to you and let you know as well as give you options specific to your case.

Q. What if my ECU has previously been tuned

A. While things can always change in the future, at this time we are able to flash over all known competitor flashes.

Q. Can the Dealership tell it has been flashed?

A. At this time, yes.  It's very likely that the dealership will be able to see this, so if you're concerned about warranty or racing bodies being able to detect the flash, you may want to wait until we've further refined the process.

If you have additional questions or concerns.  Reach out to our Customer Support team.

Customer Support


Phone support available 9am to 6pm Monday-Thursday. 9am to 4pm Friday (CST)


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