P2074: MAP/MAF - Throttle Position Correlation at Higher Load
The Powertrain Control Module (PCM) detects a discrepancy between the Manifold Absolute Pressure (MAP) sensor, Mass Air Flow (MAF) sensor, and Throttle Position Sensor (TPS) signals during high engine load conditions. This indicates that the actual air intake does not match the expected values based on throttle position, often due to vacuum leaks, faulty sensors, or restricted airflow.
1. Most Common Causes
- Vacuum leaks in the intake manifold, hoses, or PCV system
- Faulty or erratic MAP sensor
- Contaminated, disconnected, or out-of-range MAF sensor (if equipped)
- Carbon buildup in the throttle body or faulty integrated TPS sensor
- Collapsed or clogged air filter, or intake duct restriction
- Short circuit, open circuit, or corroded connectors in MAP/MAF/TPS circuits
- PCM calibration update required per manufacturer technical service bulletins
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or hesitation under load
- Poor fuel economy
- Rough idle or stalling
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect for vacuum leaks using smoke machine or propane.
Step 3: Test MAP sensor voltage and compare to expected values.
Step 4: Test MAF sensor frequency and clean if dirty.
Step 5: Test TPS voltage sweep and check for smooth operation.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as reduced power and poor fuel economy may occur, and further damage could result.
How much does it cost to fix?▼
Diagnosis typically costs $50-$150. Repairs vary: cleaning MAF ($10-$20), replacing MAP sensor ($50-$120), fixing vacuum leak ($100-$300).
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.