What Does P0105 Mean?
The manifold absolute pressure (MAP) sensor or barometric pressure (BARO) sensor circuit has a general malfunction. The PCM cannot get a valid pressure signal from the MAP/BARO sensor, which is essential for calculating engine load, fuel delivery, and ignition timing. The driver will experience poor performance, rough idle, hesitation, stalling, and poor fuel economy because the PCM cannot accurately determine engine load.
Common Causes
30%
Faulty MAP/BARO sensor with internal circuit failure
25%
Disconnected or damaged vacuum hose to the MAP sensor
20%
Wiring issue in the MAP sensor circuit (open, short, or high resistance)
15%
Corroded or damaged connector at the MAP sensor
10%
PCM internal failure on the MAP sensor input circuit
Diagnostic Steps
1
Check the MAP sensor PID with key on, engine off — it should read close to barometric pressure (approximately 29.9 inHg or 101 kPa at sea level, less at altitude).
2
Start the engine and check MAP at idle — it should read approximately 15-22 inHg (50-75 kPa) depending on the engine; a reading stuck at atmospheric or near zero indicates a malfunction.
3
Verify the vacuum reference hose to the MAP sensor is connected, not cracked, not kinked, and not clogged — disconnect and verify vacuum is present at the hose end (should see 15-22 inHg at idle).
4
With the sensor unplugged, check for 5V reference and ground at the connector — missing reference voltage indicates a wiring or PCM issue.
5
If vacuum source and wiring are good, replace the MAP sensor and retest.
Estimated Repair Cost
$40 - $250
Parts + labor, varies by vehicle and location
The manifold absolute pressure (MAP) sensor or barometric pressure (BARO) sensor circuit has a general malfunction. The PCM cannot get a valid pressure signal from the MAP/BARO sensor, which is essential for calculating engine load, fuel delivery, and ignition timing. The driver will experience poor...
The most common cause of P0105 (Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction) is: Faulty MAP/BARO sensor with internal circuit failure
Typical repair costs for P0105 range from $40 to $250, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle may stall or have very poor throttle response. The PCM will use a default value or estimate from other sensors, but drivability will be significantly compromised. Drive cautiously to a repair facility. Avoid situations requiring rapid acceleration.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0105 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel / Air Metering System
Difficulty
Type
Generic (SAE)
Recommended Tools
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