P1638Immobiliser data doesn't match between engine and body computers

• Suzuki code · Engine

How the car detects it

The immobiliser data held by the engine computer and by the body computer differ. It happens when one of them was replaced with a part from another car, or when they can't communicate.

What you may notice

• The engine may not start

Likely causes

• LikelyAn engine or body computer from another car fitted without being matched
• PossibleCommunication fault between the engine and body computers

Sources

• manualslib.com › Suzuki-Swift-Sport-2008.html
• manualslib.com › Suzuki-Sx4.html
• manualslib.com › Suzuki-Grand-Vitara-Jb416.html

Backed by at least two independent sources.

From Obdaryn's Suzuki pack, exactly as the app shows it, with the public sources above. Guidance only; confirm with a workshop.