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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 911 (Immobilizer System) >> Diagnostic Information and Procedures >> DTC P1630 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: Because of normal system communications between the BCM and ECM/PCM, any theft deterrent B-codes must be diagnosed prior to the diagnosis of P-codes.

Perform the 10-Minute Immobilizer Relearn procedure. Refer to Immobilizer System Component Programming  . The ECM/PCM should successfully complete the password learn and the vehicle should start.

NOTE: If the ECM/PCM does not complete the learn or vehicle starting remains disabled, replace the ECM/PCM.
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