Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
The cost to diagnose the P0068 GMC code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.
The Engine Control Module (ECM) compares actual air flow based on Throttle Position (TP) to a calculated air flow based on the Manifold Absolute Pressure (MAP) sensor, and Mass Air Flow (MAF). The Diagnostic Trouble Code (DTC) will be set if the ECM detects that the actual air flow rate is greater than the calculated air flow.
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