Circuit/System Verification

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Because of normal system communications between the TDM and ECM, 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 (Canada) or Immobilizer System Component Programming (North America except Canada) . The ECM/PCM should successfully complete the password learn and the vehicle should start.

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