P0069: Manifold Absolute Pressure - Barometric Pressure Correlation. Meaning, possible symptoms and checks before repair.
Meaning, symptoms, causes and checks
Manifold absolute pressure and reported atmospheric pressure do not agree as expected. With the engine stopped and pressures equalized, comparison can reveal an offset input or an obstructed pressure path. BARO may be measured or inferred, depending on the vehicle.
Affected system: Powertrain
Symptoms
- Engine warning light; a fallback operating mode is possible.
- Uneven idle, hesitation or reduced power, depending on the control strategy.
Possible causes
- Biased MAP/BARO sensor or obstructed pressure port.
- Faulty supply, ground or signal wiring; inaccurate BARO information.
What to check
- Identify the BARO source and MAP sensor in the engine information; do not assume two separate sensors exist.
- With ignition on, engine off and pressures equalized, compare MAP, BARO and actual local atmospheric pressure.
- Use atmospheric pressure at the vehicle’s altitude; weather readings corrected to sea level can mislead the comparison.
- Inspect the MAP port and any sensing hose; test reference supply, ground and signal using the wiring diagram.
- After repair, clear codes and recheck MAP and BARO under the original recorded conditions, following the manufacturer’s procedure.
Also written as: P0069-00, P006900, PO069 (some scan tools add the fault-type byte, e.g. -00).