AutoFixDB - Free OBD-II diagnostic trouble code lookup. Find causes, symptoms, diagnostic steps and repair solutions.

Overview

Generic OBD-II code P0068 indicating a discrepancy in sensor data correlation between MAP, MAF, and TPS causing air intake measurement conflict

Common Symptoms

Check Engine Light illuminated
Rough idle
Poor acceleration
Reduced fuel efficiency
Engine stalling

Most Common Causes

Faulty or failing MAP sensor high

MAP sensor providing incorrect manifold absolute pressure data relative to other intake sensors

Faulty or failing MAF sensor high

MAF sensor readings inconsistent with MAP and throttle position inputs

Faulty or failing throttle position sensor (TPS) medium

TPS data mismatch leading to correlation error

Vacuum or intake leaks medium

Leaks cause inaccurate air pressure/flow readings leading to sensor correlation faults

Wiring/connectors issues medium

Corroded or damaged electrical connections affecting sensor signals

Diagnostic Steps

Connect a professional scan tool and retrieve all fault codes

Expected: List of codes including P0068 and any related sensor codes

Interpretation: Presence of additional sensor-specific codes helps isolate faulty component
Visually inspect intake system for vacuum leaks, cracked hoses, and loose clamps

Expected: No visible leaks or disconnected hoses

Interpretation: Leaks or loose fittings can cause erroneous sensor readings
Verify condition and connections of MAP, MAF, and TPS electrical harnesses

Expected: Clean, intact wiring with secure connectors

Interpretation: Electrical issues can distort sensor signals leading to code
Test MAP, MAF, and TPS sensor outputs with a multimeter or live data

Expected: Sensor outputs change smoothly and within expected ranges

Interpretation: Out-of-range values indicate specific sensor fault
Check air filter and throttle body for contamination or blockage

Expected: Clean air filter and throttle body

Interpretation: Restricted airflow affects sensor correlation

Repair Solutions

Replace faulty MAP sensor medium

Estimated Cost: $50 - $200

Sensor cost and labor vary by vehicle model

Replace faulty MAF sensor medium

Estimated Cost: $90 - $400

Cleaning the MAF is cheaper initial step if sensor not failed

Replace or repair TPS medium

Estimated Cost: $100 - $250

Must confirm TPS fault via testing before replacement

Repair vacuum or intake leaks medium

Estimated Cost: $100 - $300

Cost depends on extent of leak and parts needed

Clean throttle body and intake components easy

Estimated Cost: $20 - $100

Often reduces symptoms if buildup present

Common Misdiagnoses

Avoid these common diagnostic mistakes:

Assuming pure fuel system fault without verifying intake and sensor data correlation

Frequently Asked Questions

Can you explain the meaning of P0068?

The P0068 code stands for MAP/MAF - Throttle Position Correlation. This generally indicates an issue with the Air Intake system.

Is it safe to drive with a P0068 code?

The P0068 code is considered medium severity. May result in rough idle, reduced power, stalling, and degraded fuel efficiency due to incorrect airflow signal interpretation

Common signs of the P0068 error code

Common symptoms include: Check Engine Light illuminated, Rough idle, Poor acceleration. You might also notice the Check Engine Light is on.

What parts fail when P0068 is set?

It can be caused by several factors, most notably: Faulty or failing MAP sensor, Faulty or failing MAF sensor, Faulty or failing throttle position sensor (TPS).

Estimated repair costs for different causes of P0068

It depends on what needs to be fixed. Clean throttle body and intake components repairs are cheaper (~$100), while Replace faulty MAF sensor repairs are on the higher end (~$400).

Is the P0068 code specific to Jeep?

The P0068 code is a generic powertrain code, meaning it applies to almost all makes and models, such as Honda, Toyota, VW, Ford, and Chevy.

P0068: MAP/MAF - Throttle Position Correlation