P0106 Fault Code

Long Description

Fault code P0106 is logged when the engine control unit (ECU) detects a problem with the manifold air pressure (MAP) output voltage range. It can also be triggered when there is an issue with MAP performance.

The MAP, also called the manifold vacuum, is kept at a lower pressure than atmospheric pressure to allow for the flow of combustion reactants into the engine.

The MAP sensor sends a signal to the ECU to give information about the pressure within the manifold, allowing for better performance from the engine. With this information, the ECU can determine air-fuel ratios and engine load.

This signal should typically range between 1 and 4.5 V depending on the state of the engine – be it idling or driving.

Your vehicle may also have a barometric pressure sensor (BARO), as well as a combination of a MAP and BARO sensor.

Manufacturers like Fiat, Volkswagen, Volvo, and Infiniti are some of the most common to have this fault code reported. Although, any vehicle can have this issue.

Other Signs of This Problem

Because this issue can mean the ECU is not getting the correct information, and subsequently cannot determine several factors for the engine, there are several noticeable symptoms.

The first and most obvious will be that the Check Engine light will be illuminated.

Other signs can also be very noticeable. These can be things like the vehicle being unable to idle. Additionally, the engine can run very poorly and roughly.

There may also be black smoke coming from the vehicle as unburnt fuel leaves the exhaust system. It is worth noting that some diesels can produce black smoke under heavy acceleration which is not the same as the constant smoke that will be emitted in this case

It is possible that other MAP fault codes will be logged as well. Look out for P0107, P0108, and P0109.

What Could Be The Problem?

There are several things that can fix fault code P0106, depending on the issue itself. These can either be electrical or mechanical in nature. However, it is more likely to be electrical as the code represents an issue with the output voltage.

One of the most common causes is a malfunction with an intake or vacuum component. Any damaged, loose, or missing parts like the intake hose and its fittings can lead to this fault code being logged.

If none of the above symptoms are present, the issue could be traced to a faulty MAP or BARO sensor.

As always, it is possible that loose or damaged wiring to a sensor can result in its corresponding error. Additionally, the MAP sensor could be dirty.

Fixes

(This YouTube video shows you a DIY method for fixing the P0106 fault code)

It is important to determine whether the electrical components are all in working order before looking for problems like leaks.

The MAP sensor should be checked to determine if it is working correctly. If not, it should be replaced.

The wiring should be checked for damage or fraying. Any issues should be repaired. The wiring connections should also be checked to ensure that they are properly fixed.

Any leaks in the intake or vacuum should be fixed which will hopefully result in the P0106 fault code disappearing.

Seriousness

Fault code P0106 should be considered a serious problem. Most issues that directly cause the ECU to guess parameters have the potential to cause significant damage to the engine and its components.

If you notice these symptoms, be sure to stop driving immediately. This code should ideally be resolved immediately.