P0105 Code Meaning and Next Steps

First checks take 10 to 15 minutes for the first checks. No special tools are usually needed for the first checks.

Can you keep driving?

Stop driving if any of these apply

!The engine starts running much worse, stalls, or the warning light flashes.
!The vehicle begins to overheat or lose power sharply while the code is active.

If the light is steady and the vehicle still drives normally: Often yes for a short time, but it should not be ignored.

What to check first

Step-by-step checks

1
Free - no tools
Inspect the MAP connector and harness for looseness, corrosion, or heat damage
2
Free - no tools
If the sensor uses a vacuum hose, make sure the hose is connected, not cracked, and not blocked
3
Basic tool needed
Compare key-on engine-off MAP data with the local barometric pressure or expected altitude if scan data is available
4
Basic tool needed
Check for obvious intake or vacuum issues before replacing the sensor
5
Basic tool needed
If the code appeared after a repair, confirm the hose routing and connector seating first

If the code returns

-If the reading does not behave plausibly with key on engine off, circuit testing becomes more important than another visual check.
-If a hose-fed sensor has an obvious vacuum problem, fix the hose path before buying a sensor.
-If the code returns after a replacement, revisit the wiring and reference side rather than assuming the new part is bad.

Background

What this code means

P0105 is a generic OBD-II manifold absolute pressure (MAP) sensor code.

On some vehicles the MAP sensor also helps with barometric or load calculations, so a circuit fault can affect more than one part of the fuel strategy.

Hard starting, rough idle, poor throttle response, or odd shift behavior can show up when the MAP signal is not trustworthy.

Diagnosis

Common causes

Most common

Failed MAP sensor

The sensor can lose output or fail the internal circuit checks.

Common

Vacuum hose disconnected or leaking

A hose-fed MAP sensor needs a sound vacuum path to read correctly.

Common

Wiring or connector issue

A poor connection can create a circuit malfunction code.

Possible

Shared reference or ground fault

The sensor may be fine but the circuit feeding it is not.

Avoid these mistakes

What not to do

xDo not replace the sensor first if there is an obvious wiring, connector, or intake issue.
xDo not ignore drivability changes just because the code sounds like a sensor problem.

Parts

Parts that may need replacing

PartTypical costNotes

MAP sensor$40-$160Relevant when the sensor or circuit test fails after basic checks.

Vacuum hose$10-$40Relevant on hose-fed sensors if the line is cracked, loose, or blocked.

Connector repair$15-$90Worth checking if the plug or pins are loose or corroded.

Related OBD codes

P0106

P0106 usually means the MAP signal is outside the expected range or performance window.

P0107

P0107 usually means the MAP signal is reading too low.

P0108

P0108 usually means the MAP signal is reading too high.

P0109

P0109 usually means the MAP signal is intermittent or erratic.

Source notes

Generic OBD-II (SAE J1979 / ISO 15031-5). P0105 was expanded around common MAP circuit faults, including sensor failure, vacuum-line problems, and wiring issues.

This guide is written as a generic multi-make reference, so bulletin history, sensor locations, and repair order can still change by manufacturer and engine family.

This is generic OBD-II guidance and should not override vehicle-specific service information. Exact diagnosis and repair steps vary by make, engine family, and model year.

Last reviewed: 2026-04-10

Reference: Open reference

P0105 - P0105 Usually Means the Map Sensor Circuit Has a Malfunction