P0068 — MAP/MAF - Throttle Position Correlation
The ECU detects implausibility between throttle position and the airflow or intake manifold pressure measured. At a given throttle angle the air mass deviates beyond rationality limits.
General code reference. Confirm the definition and diagnostic procedure for your vehicle's year, model and engine. A stored code alone does not identify a failed part.
Affected components
- Throttle position sensor
- Mass air flow sensor
- Manifold absolute pressure sensor
- Intake manifold
- Throttle body
Possible causes to check
These are possible checks, not a ranked diagnosis. Follow the vehicle manufacturer's test procedure before replacing parts.
- Large unmetered vacuum leak
- Throttle body dirty or sticking
- MAF sensor drift
Possible symptoms
- Check engine light on
- Power loss, hesitation under acceleration
- Rough or unstable idle
- Increased fuel consumption
- Possible difficulty starting
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Sources
Check each reference's vehicle and model-year scope. General background links do not establish which fault is most likely on your vehicle.
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.