Powertrain, generic · Fuel and air metering

P0105 Manifold Absolute Pressure/Barometric Pressure Sensor Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

The manifold absolute pressure (MAP) sensor measures the pressure behind the throttle; on vehicles without a separate barometric sensor it also supplies the ambient pressure, read at key-on or wide-open throttle – hence 'MAP/BARO'. It is a three-wire sensor with 5 V reference, ground and signal. P0105 is the general circuit fault and is rarely used today: most petrol engines report low, high and intermittent separately (P0107–P0109). It appears mainly where the fault cannot be broken down further – Ford's 2023 diesels set it when the digital SENT sensor reports a bad status or an out-of-limit value for 5 s (lost communication is a separate U code), and Bosch EDC16 diesels use it with a fault type byte, for example signal below 0.2 V. Saab then substitutes 101.3 kPa, limits torque and switches off EGR and boost control.

Likely causes

Connector or wiring to the sensor open, shorted or loose
MAP sensor faulty (oiled, failed internally, SENT status fault)
Sensor hose disconnected, vacuum or boost leak
5 V reference pulled down by another sensor on the same circuit
Engine control module faulty

Symptoms

  • Check engine light on
  • Loss of power, limp mode with torque limit (diesel)
  • Rough idle, hard starting, higher consumption (petrol)
  • Smoke possible on diesels

Repair estimate

DifficultyEasyDIY possible
Parts and labour€20–200
Time0.3–1 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

manifold absolute pressure sensorsensor wiringsensor reference voltage

Related codes

P0106P0107P0108P0109P0069P2227

References: law.cornell.edu, fordservicecontent.com, saabwisonline.com, saabwisonline.com.