P0068

MAP/MAF - Throttle Position Correlation

The engine computer sees a mismatch between the throttle opening and the air entering the engine. This usually means a dirty throttle body, bad airflow sensor, vacuum leak, or wiring problem. It can cause poor running, hesitation, or stalling.

SEV: 3/5
DRIVE: CAUTION
DIY: $10–$150
SHOP: $100–$500

Quick answer

AI-CITATION READY

What it means

P0068 means the powertrain control module has detected a correlation problem between throttle position and measured engine air flow, usually from the MAP and/or MAF signals. The computer expects these inputs to agree within a normal range under a given engine load and RPM, but one or more signals are reading incorrectly or responding too slowly.

Can you drive with it?

With caution. You may be able to drive short distances, but the engine can hesitate, stall, or run poorly. If the check engine light is flashing, the car stalls, or power is very limited, do not continue driving.

Most common causes

Dirty or sticking throttle body
Faulty MAF sensor or contaminated MAF element
Vacuum leak or unmetered air entering the engine

Typical repair cost

DIY usually runs $10–$150. Typical shop repair lands around $100–$500, depending on the root cause.

01 / Definition

02 / Drive status

03 / Symptoms

Check engine light
Hesitation on acceleration
Rough idle
Stalling
Reduced engine power
Poor fuel economy
Surging or unstable idle
Slow throttle response

04 / Causes

1	Dirty or sticking throttle body	high
2	Faulty MAF sensor or contaminated MAF element	high
3	Vacuum leak or unmetered air entering the engine	high
4	Faulty MAP sensor or bad MAP signal	medium
5	Throttle position sensor or electronic throttle body fault	medium
6	Damaged wiring, loose connector, or corrosion in sensor circuits	medium
7	Intake duct leak, cracked hose, or loose air filter box	medium
8	Software issue or PCM calibration problem	low

05 / Diagnostic sequence

01Scan for all stored and pending codes and note any related airflow, throttle, or fuel trim codes.
02Inspect the air intake system for loose clamps, cracked ducts, disconnected hoses, or air leaks after the MAF sensor.
03Check the throttle body for heavy carbon buildup and verify that the throttle plate moves smoothly.
04Inspect the MAF sensor, MAP sensor, and throttle body connectors for corrosion, bent pins, loose fit, or damaged wiring.
05Compare live data from MAF, MAP, throttle position, engine load, RPM, and fuel trims to see which signal is abnormal.
06Clean the throttle body with the correct cleaner and clean the MAF sensor only with MAF-safe cleaner if contamination is present.
07Test for vacuum leaks with smoke testing or a scan tool while monitoring fuel trims.
08If the problem remains, test the sensors and circuits with a multimeter and follow the factory diagnostic chart for the vehicle.

06 / Repairs

1	Clean the throttle body and inspect for sticking throttle plate or carbon buildup	$10–$40
2	Repair loose hoses, cracked intake tubing, or vacuum leaks	$20–$150
3	Clean or replace the MAF sensor if readings are incorrect	$15–$250
4	Test and replace a faulty MAP sensor, throttle position sensor, or throttle body assembly	$50–$500
5	Repair wiring damage, corroded connectors, or poor grounds	$50–$250
6	Perform PCM software update or follow manufacturer relearn procedure if required	$0–$150

07 / Related codes

08 / FAQ

What does P0068 mean?

It means the engine computer sees a mismatch between throttle position and the air flow signals from the intake system.

Can a dirty throttle body cause P0068?

Yes. Carbon buildup can make the throttle plate stick or move incorrectly, which can trigger this code.

Can a vacuum leak cause P0068?

Yes. Extra air entering the engine can make the MAP and MAF readings disagree with throttle position.

Will P0068 clear itself?

Sometimes it may go away temporarily, but if the underlying fault remains, the code will return.

Do I need to replace the throttle body first?

No. Inspect for air leaks, sensor issues, wiring problems, and dirt buildup first because those are more common and less expensive.

09 / Source and method

DATA BASIS: OBD-II REFERENCE + OBD2.HELP
METHOD: STATIC VALIDATION
SAFETY: INFORMATIONAL

This page combines OBD-II diagnostic reference data with OBD2.help generated diagnostic guidance for code meaning, likely causes, and repair direction.

Publishing uses deterministic schema and build validation, plus manual spot checks on representative pages before release.

Safety-critical diagnosis and repairs should be confirmed with a qualified mechanic, especially when the vehicle is misfiring, overheating, or losing power.

01 / Definition

04 / Causes

Dirty or sticking throttle body

high

Faulty MAF sensor or contaminated MAF element

high

Vacuum leak or unmetered air entering the engine

high

Faulty MAP sensor or bad MAP signal

medium

Throttle position sensor or electronic throttle body fault

medium

Damaged wiring, loose connector, or corrosion in sensor circuits

medium

Intake duct leak, cracked hose, or loose air filter box

medium

Software issue or PCM calibration problem

low

05 / Diagnostic sequence

01Scan for all stored and pending codes and note any related airflow, throttle, or fuel trim codes.

02Inspect the air intake system for loose clamps, cracked ducts, disconnected hoses, or air leaks after the MAF sensor.

03Check the throttle body for heavy carbon buildup and verify that the throttle plate moves smoothly.

04Inspect the MAF sensor, MAP sensor, and throttle body connectors for corrosion, bent pins, loose fit, or damaged wiring.

05Compare live data from MAF, MAP, throttle position, engine load, RPM, and fuel trims to see which signal is abnormal.

06Clean the throttle body with the correct cleaner and clean the MAF sensor only with MAF-safe cleaner if contamination is present.

07Test for vacuum leaks with smoke testing or a scan tool while monitoring fuel trims.

08If the problem remains, test the sensors and circuits with a multimeter and follow the factory diagnostic chart for the vehicle.

06 / Repairs

Clean the throttle body and inspect for sticking throttle plate or carbon buildup

$10–$40

Repair loose hoses, cracked intake tubing, or vacuum leaks

$20–$150

Clean or replace the MAF sensor if readings are incorrect

$15–$250

Test and replace a faulty MAP sensor, throttle position sensor, or throttle body assembly

$50–$500

Repair wiring damage, corroded connectors, or poor grounds

$50–$250

Perform PCM software update or follow manufacturer relearn procedure if required

$0–$150

08 / FAQ

What does P0068 mean?

It means the engine computer sees a mismatch between throttle position and the air flow signals from the intake system.

Can a dirty throttle body cause P0068?

Yes. Carbon buildup can make the throttle plate stick or move incorrectly, which can trigger this code.

Can a vacuum leak cause P0068?

Yes. Extra air entering the engine can make the MAP and MAF readings disagree with throttle position.

Will P0068 clear itself?

Sometimes it may go away temporarily, but if the underlying fault remains, the code will return.

Do I need to replace the throttle body first?

No. Inspect for air leaks, sensor issues, wiring problems, and dirt buildup first because those are more common and less expensive.

09 / Source and method

DATA BASIS: OBD-II REFERENCE + OBD2.HELP
METHOD: STATIC VALIDATION
SAFETY: INFORMATIONAL

This page combines OBD-II diagnostic reference data with OBD2.help generated diagnostic guidance for code meaning, likely causes, and repair direction.

Publishing uses deterministic schema and build validation, plus manual spot checks on representative pages before release.

Safety-critical diagnosis and repairs should be confirmed with a qualified mechanic, especially when the vehicle is misfiring, overheating, or losing power.