P0069 Fault Code

Long Description

Fault code P0069 is logged when the powertrain control module (PCM) has detected an issue with the manifold absolute pressure (MAP) sensor and the barometric (BARO) pressure sensor.

This code specifies that the readings from these two sensors do not correlate with one another within the allowable range.

The MAP sensor is used to read the pressure in the engine manifold and provide this information about it to the PCM. These are fairly common in most vehicles. However, more and more cars are coming equipped with a mass airflow sensor instead.

The BARO sensor is found on some vehicles. It is responsible for providing information about the atmospheric air pressure to the PCM. This is then used to compare data with the MAP sensor readings.

These two sensors work in conjunction with the PCM to increase performance and efficiency.

Only vehicles with both of these sensors can suffer from this code, but manufacturers like Citroen, Ford, and Peugeot are some of the most common to have this code logged.

Other Signs of This Problem

This fault code may not come with a host of very noticeable symptoms, but there will typically be some slight changes in the vehicle’s performance.

One of the most obvious signs will be the presence of the Check Engine light on the dashboard.

The vehicle’s performance will also change slightly. This will most likely include the engine running slightly rougher and a reduction in power to some degree.

A decrease in fuel economy is another sign that has been reported.

This code will usually come with other fault codes that can help pinpoint which sensor may be causing the correlation issue. Be sure to look out for codes like P0105 to P0108. There may also be BARO sensor codes like P0129.

What Could Be The Problem?

The causes for this issue will usually be found in either the MAP or BARO sensor circuits.

Either one of these sensors can be defective, which would cause this code. In addition to this, either one of the sensors can be too dirty to provide accurate readings.

Electrical faults in the sensor circuits can also lead to this code being logged.

Vacuum leaks between the intake manifold and the MAP sensor are another fairly common cause of this issue.

In rare cases, a failed PCM can be the cause. However, this will typically be accompanied by a number of additional fault codes being logged.

Fixes

Fixing this code will usually require some light electrical work in the sensor circuits or replacing faulty parts, but it is important to address any other fault codes that relate to these sensors which may have been logged.

If the MAP or BARO sensors are dirty, they should be cleaned thoroughly. Faulty or damaged sensors should be replaced altogether.

Any issues in their circuits like loose connections or damaged wires need to be fixed accordingly.

Similarly, any vacuum leaks upstream of the MAP sensor need to be fixed.

If it can be determined that the PCM is at fault, it should be replaced. It is also possible that the PCM needs a software update.

Seriousness

Fault code P0069 is a relatively mild problem in terms of severity. It can have a negative effect on the performance and fuel economy of the vehicle, but it does not pose much risk to the various engine components.

It is a good idea to have this issue resolved within a few weeks.