What Does P00B8 Mean?
The PCM has detected a correlation error between the manifold absolute pressure (MAP) sensor and the mass air flow (MAF) sensor on bank 2. The calculated airflow from the MAP sensor does not match the measured airflow from the MAF sensor beyond acceptable limits. On V-engine or dual-intake configurations, this specifically affects the bank 2 intake tract. The driver may notice poor acceleration, hesitation, rough idle, or reduced fuel economy.
Common Causes
30%
Vacuum leak or intake manifold gasket leak on bank 2
25%
Dirty or contaminated MAF sensor element on bank 2
20%
Faulty MAP sensor providing incorrect pressure readings
15%
Restricted or leaking air filter housing or ductwork on bank 2
10%
Clogged MAP sensor vacuum port or connecting hose
Diagnostic Steps
1
Compare the MAP and MAF PIDs in live data at idle and at 2500 RPM — at idle the MAP should read approximately 1-2 inHg lower than barometric with MAF at 3-7 g/s; correlate readings against manufacturer specs.
2
Perform a smoke test on the bank 2 intake tract to detect vacuum leaks at gaskets, hose connections, and the intake manifold runner.
3
Inspect and clean the MAF sensor element with dedicated MAF cleaner spray — do not touch the hot wire/film element; let it air dry completely before reinstalling.
4
Verify the MAP sensor vacuum reference hose is not cracked, kinked, or clogged — disconnect and blow through it to confirm clear passage.
5
With the engine off and key on, the MAP sensor should read close to barometric pressure (~29.9 inHg at sea level); if significantly off, replace the MAP sensor.
6
Check for a clogged or damaged air filter that could restrict airflow to the MAF sensor.
Estimated Repair Cost
$50 - $400
Parts + labor, varies by vehicle and location
The PCM has detected a correlation error between the manifold absolute pressure (MAP) sensor and the mass air flow (MAF) sensor on bank 2. The calculated airflow from the MAP sensor does not match the measured airflow from the MAF sensor beyond acceptable limits. On V-engine or dual-intake configura...
The most common cause of P00B8 (MAP - Mass or Volume Air Flow Correlation Bank 2) is: Vacuum leak or intake manifold gasket leak on bank 2
Typical repair costs for P00B8 range from $50 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Generally safe to drive but with reduced performance and fuel economy. The PCM may enter a limp mode or use default airflow values, resulting in a rich or lean condition. Extended driving with incorrect air metering can damage the catalytic converter. Diagnose within a reasonable timeframe.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P00B8 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel / Air Metering System
Difficulty
Type
Generic (SAE)
Recommended Tools
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