Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Programming the VID Block for a Replacement PCM
A new PCM contains the latest strategy and calibration level for a particular vehicle. However, the VID block is blank and needs programming. There are 2 procedures available. The first is an automatic data transfer from the old PCM to the new PCM and the second is manual data entry into the new PCM.
Automatic data transfer is carried out if the old PCM is capable of communicating. This is done by the use of a scan tool to retrieve data from the old PCM before removing it from the vehicle. The stored data can now be downloaded to the new PCM after it is replaced.
Manual data entry must be carried out if the old module is damaged and is incapable of communicating. Remove and install a new PCM. Using a compatible scan tool, select and carry out the Module/Parameter programming, referring to the manufacturer's user manual. Make certain that all parameters are included. Failure to properly program tire size in revolutions per mile, (rev/mile = 63,360 divided by the tire circumference in inches) or axle ratio, may result in codes P1635 and P1639. You may be instructed to contact the As Built data center for the information needed to manually update the VID block with the scan tool. Contact the center only if the old PCM cannot be used or the data is corrupt. For Ford and Lincoln Mercury technicians, contact the National Hotline or Professional Technician Society (PTS) website for As Built data. Non-Ford technicians, use the Motorcraft website at motorcraft.com. From the Motorcraft homepage, use the search function to find the Module Programming or As Built Data.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.