Manifold Absolute Pressure - Barometric Pressure Correlation
At engine cranking or key-on the intake manifold pressure should equal barometric pressure within tolerance. The ECU detects a deviation indicating sensor drift or vacuum line issues.
Affected components
- Manifold absolute pressure sensor
- Barometric pressure sensor
- Vacuum hose
Common causes
- High likelihood: MAP sensor failed or drifted
- Medium likelihood: Vacuum hose to MAP sensor leaking
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.