P0068 CHEVROLET - MAP/MAF - Throttle Position Correlation
Air leak between the MAF sensor and throttle body
Dirty Throttle body or Mass Air Flow (MAF) sensor
Throttle Position (TP) sensor not seated properly
Faulty Throttle Position (TP) sensor
Faulty Mass Air Flow (MAF) sensor
When is the code detected?
If the PCM detects that the difference between the actual air flow (MAF) and the speed density calculated air flow is greater than expected, DTC P0068 sets.
Engine Light ON (or Service Engine Soon Warning Light)
Lack/Loss of power
Engine rough idle
P0068 Chevrolet Description
The Powertrain Control Module (PCM
) uses the Throttle Position (TP), Barometric Pressure (BARO), Intake Air Temperature
(IAT), and engine RPM in order to calculate the predicted mass airflow rate. The PCM
compares the predicted Mass Air Flow (MAF
) value to the actual mass airflow value and the speed density calculation in order to verify the proper throttle operation.