P1621 Suzuki - Immobilizer control module/engine control module (ECM) - communication malfunction

Immobilizer control module/engine control module (ECM) - communication malfunction. The control module detected a communication fault involving Immobilizer control module/engine control module (ECM) on the vehicle network. This is the manufacturer-specific definition used by Suzuki.

P1621 is a manufacturer-specific code. In this database it is documented for: Suzuki. The same number can mean something different on other brands.

If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry. Checksum correction is not included: it is a separate, optional service. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.