P0068 MAP/MAF - Throttle Position Correlation

P0068 means MAP or MAF data does not correlate with throttle position as expected. The module sees airflow, pressure, and throttle signals that do not agree.

Code details

Generic OBD-II · P0

System: Fuel / Air
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace sensors one by one before checking for air leaks and correlation data; this code is about disagreement between inputs.

Symptoms of P0068

Check-engine light on, sometimes with rough or uneven running.
Hesitation, surging, or a noticeable change in fuel economy.
Occasionally hard starting or a smell of unburnt fuel.

Common causes of P0068

A failing or contaminated sensor (MAF, MAP, oxygen or air-fuel sensor).
Intake or vacuum leaks, or an exhaust leak near an upstream sensor.
Wiring, connector, or fuel-delivery problems that skew the reading.

Useful checks before replacing parts

Compare throttle angle, MAP, MAF, calculated load, RPM, and fuel trims under the same conditions that set the code.
Inspect intake leaks, charge-pipe leaks, throttle-body contamination, sensor wiring, sensor grounds, and air-filter sealing.
Check whether recent intake, throttle, or tune changes altered airflow behavior outside the expected model.

Related OBD-II codes

These nearby fuel / air entries can help compare wording and pin down the fault area.