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DTC codes / P01xx · Fuel and air metering / P0105

P0105MAP/Barometric Pressure Circuit Malfunction

P0105 indicates that the engine control module has detected an electrical fault in the manifold absolute pressure (MAP) sensor circuit or the barometric pressure (BARO) sensor circuit, depending on how the vehicle is configured. The computer monitors the signal voltage from the sensor and flags this code when the voltage falls outside the expected range or does not change as the engine load changes.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaFuel and air metering

Symptoms you may notice

  • Illumination of the check engine light, often with no other noticeable symptoms
  • Rough idle or unstable engine speed, especially when the engine is cold
  • Hesitation or stumble during acceleration
  • Poor fuel economy or rich-running condition
  • Black smoke from the exhaust due to over-fueling
  • In some cases, the engine may stall or be hard to start

Common causes, most likely first

  1. Faulty MAP or BARO sensor
  2. Damaged or corroded wiring or connector at the sensor
  3. Vacuum leak in the hose connected to the MAP sensor
  4. Open or short circuit in the signal, reference, or ground circuit
  5. Contaminated sensor element due to oil or carbon buildup
  6. Failed engine control module (rare)

How to diagnose and fix it

  1. Inspect the sensor and its connector for physical damage, corrosion, or loose pins
  2. Check the vacuum hose for cracks, blockage, or disconnection
  3. Measure reference voltage and ground at the sensor connector with a multimeter
  4. Backprobe the signal wire and compare voltage with a known-good sensor or manufacturer specifications
  5. Perform a wiggle test on the wiring harness while monitoring sensor voltage to detect intermittent faults
  6. Replace the MAP or BARO sensor if voltage readings are out of range or erratic
  7. Clear the code and verify the repair with a test drive and live data review

What the P0105 code really means

  • A P0105 can be set by a faulty barometric pressure sensor on vehicles that use a separate BARO sensor instead of deriving barometric pressure from the MAP sensor at key-on.
  • Many technicians replace the MAP sensor only to find the real problem is a corroded connector pin or a chafed wire in the harness, so always check the circuit before condemning the sensor.
  • On some vehicles, a dirty or failing mass airflow sensor can cause the PCM to set a P0105 because the MAP and MAF signals are cross-checked for plausibility.
  • The code does not always mean the sensor is dead; a vacuum leak or a restricted intake can cause the MAP signal to stay out of range and trigger the code.
  • Intermittent P0105 codes are often caused by a loose sensor mounting or a harness that rubs against a bracket, so a wiggle test is essential during diagnosis.

Can I keep driving with P0105?

You can usually drive the vehicle with a P0105 code, but expect reduced fuel economy and possible hesitation or stalling. Avoid heavy acceleration or towing until the fault is repaired, and have the vehicle diagnosed promptly to prevent further driveability issues.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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