Charge Air Temp / Intake Air Temp Correlation Bank 2
The P011D code indicates that the Engine Control Module (ECM) has detected a discrepancy between the Charge Air Temperature (CAT) sensor and the Intake Air Temperature (IAT) sensor on Bank 2. This typically occurs when the two sensors report temperatures that differ by more than a calibrated threshold, often due to a faulty sensor, wiring issues, or an air intake restriction. The ECM uses these sensors to optimize air-fuel mixture and boost control, so a correlation error can lead to performance issues.
01. Most Common Causes
- Faulty Charge Air Temperature sensor (Bank 2)
- Faulty Intake Air Temperature sensor (Bank 2)
- Wiring or connector issues in the sensor circuits
- Air intake restriction or leak causing temperature imbalance
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or hesitation
- Poor fuel economy
- Rough idle or stalling
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for related codes.
Step 2: Visually inspect the CAT and IAT sensors and their connectors for damage or corrosion.
Step 3: Compare live data from both sensors; they should be similar when engine is cold.
Step 4: Test sensor resistance and voltage according to manufacturer specifications.
Step 5: Check for intake air leaks or restrictions that could cause temperature differences.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe for short trips, but reduced performance and fuel economy may occur. Prolonged driving could lead to further issues, so it's best to diagnose and repair promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on which sensor needs replacement and labor rates.