Dirty or contaminated mass air flow (MAF) sensor element causing inaccurate airflow reporting; Vacuum leaks downstream of the MAF sensor or at the intake manifold gaskets; Carbon buildup on the throttle plate or in the throttle bore restricting airflow at small openings; Faulty or sticking throttle position sensor (TPS) or accelerator pedal position sensor; Wiring damage, corrosion, or loose connectors in the MAF, MAP, or TPS circuits; Failed manifold absolute pressure (MAP) sensor giving erroneous pressure readings; Mechanical issues such as a sticking throttle body or a torn intake boot

DTC codes / P00xx · Fuel and air metering and auxiliary emission controls / P0068

P0068MAP/MAF - Throttle Position Correlation

Q: What does code P0068 mean?

MAP/MAF - Throttle Position Correlation. P0068 indicates that the engine computer has detected a mismatch between the throttle body position and the airflow or manifold pressure it expects for that throttle angle. The powertrain control module (PCM) compares the throttle position sensor (TPS) signal with the mass air flow (MAF) or manifold absolute pressure (MAP) sensor reading and sets this code when the two do not correlate within a calibrated window.

P0068 indicates that the engine computer has detected a mismatch between the throttle body position and the airflow or manifold pressure it expects for that throttle angle. The powertrain control module (PCM) compares the throttle position sensor (TPS) signal with the mass air flow (MAF) or manifold absolute pressure (MAP) sensor reading and sets this code when the two do not correlate within a calibrated window.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering and auxiliary emission controls

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Rough or unstable idle, sometimes accompanied by stalling when coming to a stop
Hesitation or stumble during acceleration, especially from a standstill
Reduced engine power or limp mode triggered by the PCM as a protective measure
Poor fuel economy or an overly rich or lean exhaust smell
Inconsistent throttle response, such as a delay or surge when pressing the accelerator

Common causes, most likely first

Dirty or contaminated mass air flow (MAF) sensor element causing inaccurate airflow reporting
Vacuum leaks downstream of the MAF sensor or at the intake manifold gaskets
Carbon buildup on the throttle plate or in the throttle bore restricting airflow at small openings
Faulty or sticking throttle position sensor (TPS) or accelerator pedal position sensor
Wiring damage, corrosion, or loose connectors in the MAF, MAP, or TPS circuits
Failed manifold absolute pressure (MAP) sensor giving erroneous pressure readings
Mechanical issues such as a sticking throttle body or a torn intake boot

How to diagnose and fix it

Inspect the air intake tract for cracks, loose clamps, or disconnected hoses that could cause unmetered air to enter
Clean the MAF sensor with a dedicated MAF cleaner and verify the sensing element is free of debris
Remove and clean the throttle body bore and plate, then perform a throttle relearn procedure if required
Use a scan tool to compare live TPS, MAF, and MAP readings against expected values throughout the throttle range
Check the wiring and connectors at the MAF, MAP, and TPS for chafing, corrosion, or loose pins
Perform a smoke test to locate vacuum leaks that are not visible during a visual inspection
Replace any sensor or component that fails electrical or functional testing, then clear the code and verify the repair with a road test

Why P0068 often misleads on throttle body replacement

A dirty MAF sensor is frequently the real culprit behind P0068, yet many technicians replace the throttle body first because the code mentions throttle position correlation.
Small vacuum leaks that are invisible to the eye can skew the MAP or MAF reading just enough to set this code without causing a noticeable driveability complaint.
After cleaning or replacing the throttle body, a relearn procedure is often required; skipping it can cause the code to return immediately even though the repair was correct.
The PCM may set P0068 as a consequence of a failing accelerator pedal position sensor on drive-by-wire systems, so the pedal assembly deserves testing alongside the throttle body.
Intake air leaks between the MAF sensor and the throttle body can allow unmetered air to enter, creating a correlation error that mimics a faulty sensor.

Can I keep driving with P0068?

You can usually drive the vehicle to a repair shop, but avoid aggressive acceleration and heavy loads because the PCM may enter limp mode without warning. If the engine stalls, idles roughly, or loses power, stop driving and arrange a tow to prevent a safety hazard.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.