OBD-II Code · Sensors
P0105
MAP/BARO Circuit Malfunction
Severity
medium
Worth booking. It costs fuel, emissions or comfort until it is fixed.
Can you drive it
Only if running normally
A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety.
Indicative cost (USD)
$80–$250
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
Manifold pressure sensor circuit fault.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then work the likely-causes list in the order shown.
That order is what a shop checks first for this code — wiring and connections before the component they run to, because a connector costs nothing to inspect and is a common answer.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Check engine light
- Rough idle
- Poor throttle response
Likely causes
- Failed MAP sensorMost common
- Wiring
- Vacuum line damage
Read the full diagnostic procedureP0105 is the general MAP/BARO circuit fault — the ECM cannot read a coherent pressure signal, distinct from the range/performance P0106 and the high/…
P0105 is the general MAP/BARO circuit fault — the ECM cannot read a coherent pressure signal, distinct from the range/performance P0106 and the high/low input P0107/P0108. On speed-density engines (Chrysler Hemi, GM LS without MAF, most diesels) a P0105 will put the engine in severe limp mode because the ECM has no way to calculate load.
Cheapest-first ladder
- locate the MAP sensor (intake manifold top on most gas engines, intake elbow on Cummins/Duramax/Powerstroke), unplug the connector, and inspect for oil contamination in the connector body (a soaked connector means the MAP vacuum port is pulling oil mist past a failed PCV system and the sensor is likely also internally fouled); verify the 5V reference with key-on engine-off, should be 4.9-5.1V; verify ground integrity under 0.1V drop; with engine at warm idle, MAP voltage on most GM 3-bar sensors reads 1.0-1.5V at idle (roughly 30-40 kPa) and 4.0-4.7V at WOT (95-105 kPa absolute), 1-bar sensors on most imports read 1.0-1.5V at idle and 4.5-4.8V at WOT/key-on-engine-off (since atmospheric is roughly 100 kPa).
- A MAP reading 4.5V at idle on a gas engine is signaling atmospheric pressure inside the manifold, which means either a disconnected vacuum line to the sensor, a clogged vacuum port, or a stuck-open throttle plate — do not replace the sensor before tracing the vacuum reference.
Vehicle-specific patterns2005-2010 Chrysler/Dodge 5.7L Hemi sets P0105 frequently from oil saturation of the MAP sensor through a failing PCV — the sensor sits on top of the…
- 2005-2010Chrysler/Dodge 5.7L Hemi sets P0105 frequently from oil saturation of the MAP sensor through a failing PCV — the sensor sits on top of the intake and the port wicks oil mist directly into the silicon element;
- 2007-2014GM 5.3L Silverado/Tahoe places the MAP under the intake manifold valley cover and a P0105 here almost always means the intake gasket is leaking coolant onto the sensor or its connector;
- 2007-2018Cummins 5.9L/6.7L Ram trucks see P0105 from soot caking the MAP sensor port in the intake horn, requiring a clean rather than replacement on the first occurrence;
- 2008-2014VW/Audi 2.0T TSI sees P0105 from the integrated MAP/IAT sensor in the intake manifold failing internally around 80-120k miles.
Estimated repair$40 to $350.
Look up another code
P0105 — frequently asked
What does a P0105 code mean?
Manifold pressure sensor circuit fault.
What causes a P0105 code?
Common causes: Failed MAP sensor; Wiring; Vacuum line damage.
What are the symptoms of a P0105 code?
Typical symptoms: Check engine light; Rough idle; Poor throttle response.
Is it safe to drive with a P0105 code?
Only if running normally. A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety. Estimated repair: $80-$250.
How do I diagnose a P0105 code?
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed. 1. Note every code that is set, not just this one. 2. Read the freeze frame — the conditions the fault was recorded under. 3. Confirm the fault is current rather than history. 4. Then work the likely-causes list in the order shown.
More free tools