P0068: MAP/MAF - Throttle Position Correlation
The P0068 code indicates a correlation issue between the Mass Air Flow (MAF) or Manifold Absolute Pressure (MAP) sensor readings and the Throttle Position Sensor (TPS). The Powertrain Control Module (PCM) detects that the airflow entering the engine does not match the throttle position, often due to a dirty MAF sensor, vacuum leaks, or a faulty throttle body. This mismatch can cause drivability problems and may trigger limp mode.
01. Most Common Causes
- Dirty or faulty MAF sensor
- Vacuum leak in intake system
- Faulty throttle position sensor (TPS)
- Carbon buildup on throttle body
- Wiring issues or poor connections
02. Symptoms You Will Notice
- Check Engine Light on
- Rough idle or stalling
- Reduced engine power or hesitation
- Poor fuel economy
- Engine surging or unstable RPM
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect air intake system for vacuum leaks.
Step 3: Clean MAF sensor with approved cleaner.
Step 4: Check throttle body for carbon buildup and clean if needed.
Step 5: Test TPS and MAF/MAP sensor signals with a multimeter or scan tool.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the vehicle may enter limp mode, reducing power and potentially causing unsafe driving conditions.
How much does it cost to fix?▼
Costs vary from $50 for cleaning a MAF sensor to $150 for replacing a throttle position sensor, plus diagnostic fees.