P0069
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.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: easy
Common causes
Ordered by how often each turns out to be the cause.
- MAP sensor failed or driftedCommon
- Vacuum hose to MAP sensor leakingPossible
Parts involved
- Manifold Absolute Pressure Sensor
- Barometric Pressure Sensor
- Vacuum Hose
P0069 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.