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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 47 (Immobilizer System) >> Diagnostic Information and Procedures >> DTC P1630 >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

When replacing a theft deterrent module (TDM), the engine control module (ECM) must learn the new start enable password from the replacement TDM. If the ECM is replaced with a service replacement part, it is in a functional state to automatically learn the vehicle start enable password. If the TDM is replaced, the ECM must be placed in learn mode so it can learn the new TDM password. This DTC indicates the ECM is in a functional state to learn the TDM start enable password.

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