P00B8: MAP/MAF Correlation Bank 2
The P00B8 code indicates a correlation issue between the Manifold Absolute Pressure (MAP) sensor and the Mass Air Flow (MAF) sensor on Bank 2. The Powertrain Control Module (PCM) compares the airflow readings from both sensors; if they deviate beyond a calibrated threshold, this code sets. This typically points to a vacuum leak, restricted intake, or faulty sensor on Bank 2.
01. Most Common Causes
- Vacuum leak on Bank 2
- Faulty MAP sensor on Bank 2
- Faulty MAF sensor on Bank 2
- Restricted air intake or exhaust on Bank 2
- Wiring or connector issues on Bank 2 sensors
02. Symptoms You Will Notice
- Check Engine Light on
- Rough idle or hesitation
- Poor fuel economy
- Reduced engine power
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data.
Step 2: Visually inspect vacuum lines and intake for leaks on Bank 2.
Step 3: Compare MAP and MAF sensor readings with a scan tool at idle and 2500 RPM.
Step 4: Test MAP and MAF sensor voltage and signal with a multimeter.
Step 5: Perform a smoke test to locate vacuum leaks.
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 it can cause poor performance and potential engine damage. Short trips to a repair shop are acceptable.
How much does it cost to fix?▼
Repair costs vary from $50 for a simple vacuum leak fix to $150 for sensor replacement, plus labor.