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GMC Terrain will not allow security key relearn

1036 Views 1 Replies Latest reply: 2022-08-28 15:22:40


  •   Level 2   
    (23) points
    HarleyEverHome
    2022-08-22 22:47:52
     2010 GMC Terrain 2.4.  ECU / ECM was replaced, security lamp is off  (P00633 is stored) and cannot perform the security key relearn process.  The only other code is P0315 for. Crankshaft position which will not reset until the engine starts.   If I reinstall the original ECU / ECM the engine will start and run but the stalling and over fuel conditions return.  In my opinion, if the BCM, key or immobilizer module were bad the vehicle would not start with the original ECU / ECM installed.

  •   Level 2   
    (49) points
    Romoto

    2022-08-28 15:22:40 (Reply to:HarleyEverHome)

    Is the replacement pcm new or used? Also what device are you using on obd to
    perform relearn ?
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