Code Definition

P00B8 — MAP Airflow Sensor Mismatch - Bank 2

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P00B8

P00B8 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P00B8 is stored, the module has detected a signal or supply voltage lower than the expected operating range; a bank-specific fault, meaning it applies only to one cylinder bank of a multi-bank engine; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P00B8 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The fault code P00B8 is set when the Engine Control Module (ECM) detects a discrepancy between the airflow readings provided by the Manifold Absolute Pressure (MAP) sensor and other airflow measuring devices (like a Mass Airflow Sensor, MAF) for engine Bank 2. This mismatch indicates that the sensors are providing conflicting data regarding the amount of air entering the engine's cylinders on Bank 2. Such discrepancies can be caused by sensor malfunctions, air leaks, or issues in the sensor circuits. Accurate airflow measurements are crucial for the ECM to manage fuel injection and engine perf...

Join TaT to view the complete code information and diagnostic details.

Quick Facts