Trouble code solution P0069: decoding, causes, resetting, meaning

Contents

Technical description and explained code P0069
Symptoms of vehicle malfunctions
Factors that can cause this error code
How to fix or reset OBD-2 code P0069
Diagnose and repair of problems
On which vehicles does this problem occur most frequently
Video

Fault code P0069 is called “Manifold Absolute Pressure – Barometric Pressure Correlation” but in different programs it may be called differently. This fault designation applies to all vehicles equipped with OBD-II.

Technical description and explained code P0069

This Diagnostic Trouble Code (DTC) is a generic powertrain code. Error P0069 is considered a general code because it applies to all makes and models of vehicles. Although the specific repair steps may vary slightly depending on the model.

The manifold absolute pressure sensor (MAP) converts the engine vacuum into an electrical signal for the transmission control module (PCM). The engine may also have a barometric pressure sensor (BARO or simply BP) to convert the atmospheric pressure into an electrical signal for the PCM.

In addition to this data, the PCM also receives data from the mass air flow (MAF) and throttle position sensor (TPS) to determine load and altitude. The PCM looks at the MAP voltage and compares it to the BARO sensor reading the first time the ignition is turned on.

Code P0069 is set if this data differs too much. It also checks the voltage signals from the MAP and BARO sensors. It then evaluates the characteristics to see if they are correct when the throttle is in the fully open position.

The malfunction may be due to mechanical or electrical problems. The troubleshooting steps may vary depending on the manufacturer, type of MAP / BP sensor and wire colors.

Symptoms of vehicle malfunctions

The main signal that an error P0069 has occurred is the Malfunction Indicator Lamp (MIL) is also known as the CheckEngine Light.

It can also be warning signs such as:

Check engine control lamp on the control panel will light up (the code will be written to the ECM memory as a fault).
Engine cannot be accelerated, throttle response is unresponsive.
Floating revolutions, as well as attempts to stall at idle.
Ignition skips in the engine cylinders may occur. The vehicle’s engine may also run erratically.
Snitching/missing ignition at idle or under load.
Increased fuel consumption.

The severity of code P0069, can range from medium to severe. If the problem is not solved for a long time, it can lead to serious damage and even complete engine failure. If this code is found, it is recommended that you contact a qualified technician as soon as possible to diagnose and correct the error.

Factors that can cause this error code

The error code P0069 can mean that one or more of the following problems have occurred:

Barometric pressure sensor (BARO) is defective.
Absolute manifold pressure sensor (MAP) is defective.
Absolute manifold pressure sensor wiring harness is open or shorted to ground.
Bad electrical connection in the manifold absolute pressure sensor circuit.
Vacuum line between intake manifold and MAP sensor is clogged.
Contamination of air filter.
Malfunction of control module (PCM).

How to fix or reset OBD-2 code P0069

Some suggested steps for troubleshooting and fix the error code P0069:

Visually inspect the atmospheric pressure sensor (BARO).
Then the absolute intake manifold pressure sensor (MAP).
Inspect the appropriate electrical wiring and connectors for shorts, looseness, and damage.
Connect an OBD-II scan tool to the diagnostic connector, and take a reading of the absolute intake manifold pressure sensor.
Next, check the atmospheric pressure sensor readings in real time and compare the readings to see if the two sensors match.
If no problem is found, check the control module (PCM).

Diagnose and repair of problems

Locate the MAP sensor on your vehicle. It is located near the intake manifold and throttle body. Visually inspect the connectors and wiring. Disconnect the connectors and carefully inspect the terminals inside the connectors.

Check to see if they look burnt or have a green tint indicating corrosion or oxidation. If you need to clean the terminals, use an electrical contact cleaner and a plastic-bristle brush.

Inspect the vacuum line from the intake manifold to the MAP sensor. Make sure there is no debris in it and that a full vacuum is created in the manifold. Clear the diagnostic trouble codes from the memory and see if the code returns. If it doesn’t, it’s probably a wiring problem.

If the P0069 code returns, you will need to test the MAP sensor and associated circuits. After starting the engine, you should notice a change in readings. Depending on the condition of the engine and how hard you push the throttle.

If all previous tests have passed, but you continue to get a P0069 error reading. Most likely the MAP sensor has failed. Although a failed PCM cannot be ruled out until the MAP sensor is replaced.