P0105: Manifold Absolute Pressure/Barometric Pressure Sensor Circuit. Meaning, possible symptoms and checks before repair.
Meaning, symptoms, causes and checks
This code concerns the MAP/BARO measurement circuit. MAP reports absolute manifold pressure, while BARO represents atmospheric pressure. Identify the actual installation before testing; the code alone does not establish that the sensor needs replacement.
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
- Damaged wiring or connector; unstable reference supply or ground.
- Internal sensor failure; an open or shorted input, depending on the circuit design.
What to check
- Identify the sensor and pin assignment for this code, then read related supply or shared-reference faults.
- Inspect the connector and MAP port; if a sensing hose is fitted, check for cracks, pinching and deposits.
- With the engine off and pressures equalized, compare the reading with actual atmospheric pressure using the OEM tolerance.
- Test supply, ground, continuity and shorts with the circuit isolated, in the order specified by the engine manual.
- After repair, clear codes and recheck MAP/BARO pressure and input under the original recorded conditions, following the manufacturer’s procedure.
Also written as: P0105-00, P010500, PO105 (some scan tools add the fault-type byte, e.g. -00).