P0105
UniversalManifold Absolute Pressure/Barometric Pressure Circuit Malfunction
The engine computer monitors the circuit carrying pressure information from the manifold absolute pressure (MAP) sensor or barometric-pressure sensing system. P0105 means it detected a problem with that circuit, but does not by itself prove a sensor has failed. Incorrect pressure information can affect engine control and drivability. Exact system design and diagnostic procedures depend on the vehicle.
⚠️ Before You Begin (Safety First)
If the engine stalls, runs very poorly, or responds unpredictably, avoid driving in traffic and arrange a safe inspection or tow. If the vehicle runs normally, drive cautiously and have the fault diagnosed soon. Stop if the vehicle becomes unsafe to control.
Common Symptoms
- The check-engine light may be on, with no noticeable change in how the vehicle runs.
- Rough idle or hesitation may occur if the engine computer receives pressure information that does not reflect actual conditions.
- Reduced power, poor acceleration, or stalling may occur if engine control is affected.
- Fuel economy or emissions may worsen if incorrect pressure information leads to unsuitable engine control.
Common Causes
- A fault within the MAP or barometric-pressure sensing circuit, including a sensor that is not reporting pressure correctly.
- Damaged, loose, corroded, or poorly connected wiring or electrical connectors.
- A problem with circuit power or ground, where applicable to the vehicle's design.
- A blocked or damaged pressure passage or hose, if the vehicle uses one and it prevents the sensor from sensing pressure correctly.
- A less common control-module or related circuit problem; further testing is needed before considering this.
Diagnostic Steps
- Note whether the engine runs abnormally and check for other stored diagnostic codes; related codes can help guide diagnosis.
- With the engine off, visually inspect accessible MAP/barometric-pressure sensor connectors and wiring for looseness, damage, corrosion, or signs of rubbing.
- If the vehicle has an accessible pressure hose or passage for this system, check for an obvious disconnection, damage, or blockage without forcing tools into it.
- If you have a compatible scan tool, review pressure-sensor data and note whether it changes plausibly with engine conditions; use vehicle-specific service information to interpret readings.
- Do not replace a sensor based on this code alone. If wiring tests or scan-data interpretation are needed, have a qualified technician diagnose the circuit using the vehicle-specific procedure.
When to Call a Professional
Use a scan tool to review MAP and barometric-pressure data and check whether the readings behave plausibly for the vehicle's operating conditions. Inspect the sensor circuit, connectors, wiring, power and ground using the vehicle-specific service information. Check for related codes before deciding whether a sensor, wiring repair, or another correction is needed.
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Commonly Asked Questions
Does P0105 prove that the MAP sensor needs replacement?
No. The code identifies a detected pressure-sensor circuit malfunction. Wiring, connectors, circuit power or ground, and other system issues can also cause it.
What does the MAP sensor do?
It reports intake-manifold pressure so the engine computer can account for engine load when controlling engine operation. Some vehicles also use a barometric-pressure signal as part of this system.
Can I drive with P0105?
It depends on how the vehicle runs. If it stalls, runs very poorly, or is unsafe to control, stop driving and arrange help. If it runs normally, drive cautiously and schedule diagnosis.
Could a wiring problem cause this code?
Yes. A loose or damaged connection, wiring fault, or power or ground problem can interfere with the pressure signal. Inspection and testing are needed to distinguish these from a sensor fault.
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