Manifold Absolute Pressure/Barometric Pressure Sensor Circuit Intermittent

Where it lives

For P0109, the circuit described runs through the sensor. The description of P0109 reports a fault at the sensor.

Check these first

• A loose MAP or BARO connector
• Chafed wiring on the MAP or BARO circuit
• A failing MAP or BARO sensor
• Water inside the sensor connector
• A poor ground on the sensor circuit

What to do next

1. Wiggle test the MAP and BARO harness on live data
2. Inspect the wiring for chafing or pinches
3. Check the connector for water intrusion
4. Replace the sensor that drops out
5. Clean the connector and ground
6. Clear the code and retest

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