P0106

Universal

Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Problem

Definition source: General OBD-II reference catalog

Definition verification: Not independently verified for display.

Time: Varies by diagnosis and vehicle | Diagnostic difficulty: Medium

Medium Severity

The engine computer monitors manifold absolute pressure (MAP) and barometric pressure information to help calculate engine load and manage fueling and ignition. This code means the pressure signal or signals are outside the expected range or do not behave as expected. It does not by itself prove that a sensor needs replacement. Depending on the cause, engine performance or fuel economy may be affected.

Report an error with this code

⚠️ Before You Begin (Safety First)

If the engine stalls, loses significant power, runs very roughly, or the warning light flashes, stop driving when it is safe and arrange assistance. If the vehicle runs normally, a cautious trip for diagnosis may be reasonable, but avoid driving if symptoms make the vehicle difficult to control.

Common Symptoms

There may be no noticeable symptoms, especially if the detected signal issue is intermittent.
Rough idle or hesitation may occur if pressure information causes the engine computer to estimate engine load inaccurately.
Reduced power or poor acceleration may occur if engine management responds to implausible pressure readings.
Fuel economy may worsen if the pressure information contributes to incorrect fueling.
The check-engine light may be the only obvious indication.

Common Causes

A MAP sensor or related pressure signal may be inaccurate or intermittent.
Damaged, loose, corroded, or poorly connected wiring may disrupt the pressure-sensor circuit.
A problem with circuit power, ground, or signal integrity may cause readings outside the expected range.
An intake leak, vacuum leak, or restricted or damaged pressure passage may make the measured pressure inconsistent with engine conditions.
Barometric-pressure input or related wiring may be incorrect or intermittent.
A less common control-module or related-system fault may affect the pressure reading or its interpretation.

Diagnostic Steps

Check whether the engine is running roughly, losing power, or stalling. Avoid driving if those symptoms make the vehicle unsafe to operate.
With the engine off, visually inspect accessible MAP-sensor wiring and connectors for looseness, visible damage, corrosion, or contamination. Do not pull on wires or probe terminals without the correct service information.
Check accessible intake ducting and vacuum hoses for obvious disconnections, cracks, or damage that could affect pressure readings.
If a suitable scan tool is available, note other codes and freeze-frame information before clearing anything; related codes can help guide diagnosis.
Have a qualified technician compare pressure-sensor data with operating conditions and test the circuit using vehicle-specific procedures if the visual checks do not identify the issue.

When to Call a Professional

A technician can review stored and pending codes and relevant freeze-frame data, then compare MAP and barometric pressure readings under appropriate conditions. Inspecting connectors and wiring, checking the pressure signal and its power and ground circuits, and looking for intake or vacuum leaks can help distinguish a sensor problem from a circuit or engine-airflow issue. Exact test procedures and expected readings depend on the vehicle.

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Commonly Asked Questions

Does P0106 prove the MAP sensor is faulty?

No. It identifies a pressure-circuit range or performance problem. Wiring, connections, intake or vacuum issues, barometric-pressure input, and other faults can also contribute.

What does the MAP sensor do?

It measures pressure in the intake manifold. The engine computer uses that information, along with other inputs, to estimate engine load and manage engine operation.

Can I keep driving with this code?

It depends on how the vehicle behaves. If it stalls, loses substantial power, runs very roughly, or becomes difficult to control, stop driving when safe and seek assistance. Otherwise, arrange diagnosis soon and monitor for worsening symptoms.

Could an intake leak trigger this code?

Yes. A leak or a problem with a pressure passage can make measured pressure inconsistent with engine conditions. Inspection and scan-data checks help distinguish this from an electrical or sensor issue.

Should I replace a part before testing?

No. The code reports a detected condition, not a confirmed failed part. Diagnosis should check the pressure readings, related wiring and connections, and possible intake or vacuum problems first.

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