P1621Immobiliser: no communication between its module and the engine computer

• Suzuki code · Engine

How the car detects it

The immobiliser lets the engine run only with a key it knows. This code means the immobiliser control module and the engine computer can't exchange data.

What you may notice

• The engine may not start

Likely causes

• LikelyImmobiliser module fuse, supply or ground
• PossibleWiring between the immobiliser module and the engine computer
• RareImmobiliser module or engine computer

Sources

• manualslib.com › Suzuki-Swift-Sport-2008.html
• 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.