Disabling F55 on a 2003 to 2013 Corvette

Disabling F55 on a 2003 to 2013 Corvette

NOTE: Before beginning this tutorial you must have a GM Tech II. All GM dealers have this device, however they may hesitate at the disabling F55 request and/or charge you upwards of $125 to use it. We would recommend calling local auto/body shops to see if they have one available to use.

NOTE: Only the GM Tech II can be used for this tutorial. Other devices will not be able to perform the disabling function.

Step 1: With the Corvette powered OFF, connect the GM Tech II to the car by plugging it into the connection port under the driver’s footwell.

Step 2: After the GM Tech II is connected, turn the car ON.

NOTE: Make sure the F55 is plugged in. DO NOT UNPLUG THIS MODULE. To find the F55 module on a C5 Corvette, pull back the velcro lining on the front of the rear storage compartment. The F55 module on a C6 Corvette can be found under the right front fender liner.

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Step 3: Startup the GM Tech II and enter the Diagnostics menu.

GM Tech II Main Menu
GM Tech II Main Menu

Step 4: Select the year of your Corvette from the Vehicle Identification – Model Year(s) Menu. F55 is only available as on option on 2003 to 2013 Corvette model years.

GM Tech II Vehicle Identification Menu - Year Selection
GM Tech II Vehicle Identification Menu – Year Selection

Step 5: Select Passenger Car from the Vehicle Identification – Vehicle Type menu.

GM Tech II Vehicle Identification Menu - Vehicle Type Selection
GM Tech II Vehicle Identification Menu – Vehicle Type Selection

Step 6: Select Body from the System Selection menu.

GM Tech II System Selection Menu
GM Tech II System Selection Menu

Step 7: Select Y from the Vehicle Identification – Product Line menu.

GM Tech II Vehicle Identification - Product Line Selection Menu
GM Tech II Vehicle Identification – Product Line Selection Menu

Step 8: Select the Corvette Body Style from the Vehicle Identification – Body Style menu.

NOTE: A Fixed Roof Coupe (FRC) & a Z06 would be considered a Two-Door Coupe/Sedan.

GM Tech II Vehicle Identification - Body Style Selection Menu
GM Tech II Vehicle Identification – Body Style Selection Menu

Step 9: Select Automatic or Manual from the Vehicle Identification – Transmissions menu.

GM Tech II Vehicle Identification - Transmissions Selection Menu
GM Tech II Vehicle Identification – Transmissions Selection Menu

Step 10: Select Body Control Module from the Body menu.

GM Tech II Body Selection Menu
GM Tech II Body Selection Menu

Step 11: Select Special Functions from the Body Control Module menu.

GM Tech II Body Control Module Selection Menu
GM Tech II Body Control Module Selection Menu

Step 12: Select BCM RPO Reprogram from the Special Functions menu.

GM Tech II Special Functions Selection Menu
GM Tech II Special Functions Selection Menu

Step 13: Select the Corvette’s country of origin from the Setup New BCM menu.

GM Tech II Setup New BCM Selection Menu
GM Tech II Setup New BCM Selection Menu

Step 14: Under the BCM RPO Reprogram menu, you can toggle functions on and off. An asterisk is used to signal that a selected function is turned on. Navigate to the F45 option and turn it off (The asterisk will disappear netx to it.)

NOTE: The F55 option will not appear on the GM Tech II menu screen, so disable the F45 option instead.

NOTE: The HVAC Auto Temp Controls and the HVAC Manual Temp Controls are both turned on. This is normal and should be ignored.

GM Tech II BCM RPO Reprogram Selection Menu
GM Tech II BCM RPO Reprogram Selection Menu

Step 15: Save the new configuration by selecting the Save Options button.

Step 16: DO NOT TURN THE CAR OFF AND DO NOT REMOVE THE GM TECH II. Locate the F55 module and unplug the gray connector (The gray connector is the widest one.) Leave the other two connectors plugged in.

NOTE: To find the F55 module on a C5 Corvette, pull back the velcro lining on the front of the rear storage compartment. The F55 module on a C6 Corvette can be found under the right front fender liner.

Step 17: Once the gray connector has been unplugged, leave the GM Tech II plugged in and turn the car OFF.

Step 18: With the car powered off and the GM Tech II still plugged in, remove the remaining two connectors from the F55 module.

NOTE: Never plug these connectors back in again. If you do, the F55 option will automatically turn itself back on.

Step 19: Turn the car on and verify that the – MAX SPEED 80 MPH – message is gone.

NOTE: This message was only present if you had already disconnected the shock sensors. Some people have had to disconnect their battery to allow the computer to reset to remove this message.

Step 20: Unplug the GM Tech II, get in your car and take it for a ride. Smile as you pass the dreaded 80 MPH limit.

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