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Manifold Absolute Pressure/Barometric Circuit High Input

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What P0108 means

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The control unit reports “Manifold Absolute Pressure/Barometric Circuit High Input”. Code P0108 identifies the area to investigate, but it does not prove that one named part has failed without a confirming test and vehicle context.

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General information, not a diagnosis or repair instruction. Always confirm with a qualified mechanic for your specific vehicle.

For a code naming the manifold absolute pressure (MAP) sensor, read it alongside the conditions it appeared under before deciding anything.

What this code does not prove

A code naming the manifold absolute pressure (MAP) sensor reports what the control unit observed, not which part caused it. More than one cause can trigger the same code, so testing has to separate them.

Where the diagnosis usually goes next

Check the signal at its source

The manifold absolute pressure (MAP) sensor is what code P0108 is reporting on — specifically, the signal reads at or near the top of its expected electrical range. This points to an area, not a confirmed cause.

How to tell the paths apart: Read the live data and compare it against the expected range for current conditions before replacing anything.

Rule out wiring and the connector

Codes of this shape often come from damaged wiring, a corroded connector, or a poor ground on the manifold absolute pressure (MAP) sensor — not the component itself.

How to tell the paths apart: Inspect the wiring and connector for the manifold absolute pressure (MAP) sensor for damage and a secure ground before replacing anything.

Before you drive on

By itself, a code naming the manifold absolute pressure (MAP) sensor does not settle whether this specific car is safe to keep driving. Normal behaviour means limited use for diagnosis only; any change resets that decision.

Stop and arrange a check if

  • the engine is misfiring, losing power, or stalling
  • smoke, a fuel/burning smell, or overheating appears
  • the manifold absolute pressure (MAP) sensor's behaviour is clearly getting worse rather than staying stable

Before authorising a repair

  • Bring the complete code list and freeze-frame data relevant to the manifold absolute pressure (MAP) sensor
  • Ask for the test that confirms a fault in the manifold absolute pressure (MAP) sensor — not just the code alone

What to check first

  1. Pull up live data on the manifold absolute pressure (MAP) sensor and see how it compares with the range expected for the current conditions.
  2. Inspect the wiring, connector, and ground for the manifold absolute pressure (MAP) sensor before replacing the component.
  3. A manifold pressure sensor reads close to atmospheric pressure with the key on and the engine off, then drops as the engine starts and vacuum builds at idle. A reading that stays near atmospheric with the engine running, or one that does not respond to throttle movement, usually means a disconnected vacuum line, a punctured intake hose, or a sensor/wiring fault rather than a mechanical engine problem — comparing key-on and idle readings against expected ranges separates the two quickly.
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Frequently asked questions

Does this code tell me the manifold absolute pressure (MAP) sensor has failed?

No. It points to the manifold absolute pressure (MAP) sensor; the cause still needs to be confirmed by a measurement or targeted test.

What should I bring to the workshop?

The complete code list, freeze-frame data, and the conditions around the manifold absolute pressure (MAP) sensor — that gives the technician context, not a guess.

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