gmc Workshop Repair Guides

GMC Workshop Service and Repair Manuals

Relays and Modules - Emission Control Systems > < Passlock Password Learn|Page 3714
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Programming the TDC Offset

The PCM will automatically activate the TDC Offset program when the engine coolant is greater than 77°C (170°F). If the PCM is not
programmed with a TDC Offset, a DTC P1214 will set.

Relays and Modules - Emission Control Systems > < Passlock Password Learn|Page 3714