Diagnostic Aids

Check for sticking throttle plate. Check for carbon build-up on throttle plate and throttle bore. Unmetered air entering the engine may cause this DTC to set. Ensure oil dipstick is fully seated and oil filler cap is secure. Check for misrouted or damaged MAF sensor wiring harness. Ensure harness is not close to high-voltage components. Check for non-factory or aftermarket add-on devices.

Fig 1: Identifying Mass Airflow Sensor Connector Terminals (Camshaft Position Sensor, Fuel Tank Pressure Sensor & Manifold Absolute Pressure Sensor Connectors Are Similar)

Courtesy of GENERAL MOTORS CORP.