“No Communication” may be the result of using an incorrect or failed Personality Key. If the correct Personality Key is being used and the issue persists, attempt communication using a new Personality Key appropriate for use with the make of the vehicle. For example, on Ford use the K17 key in place of the K20. If communication can be established with the new key the original key has most likely failed and should be replaced.
Please contact your local Snap-on Franchisee or visit www.snapon.com to order a replacement key.
Damaged data cables or OBD-II adapters can also cause "No Communication" messages.