P0069 Code Definition
Manifold Absolute Pressure/Barometric Pressure Correlation
What the P0069 code means
What this code means is that the Powertrain Control Module is detecting contradictory readings from the manifold absolute pressure sensor and the barometric pressure sensor.
What causes the P0069 code?
Causes of the P0069 code could include a faulty manifold absolute pressure sensor, a faulty barometric pressure sensor, a fault in the circuitry of either sensor, a faulty Powertrain Control Module, or even a dirty air filter.
A dirty air filter can affect the pressure within the air induction system and the intake manifold, therefore affecting pressure readings of the barometric pressure sensor and the manifold absolute pressure sensor.
What are the symptoms of the P0069 code?
Symptoms that the driver may experience of the P0069 code include a Check Engine Light, a rough engine idle, engine surging, detonation, and possible engine damage if running for an extended period of time.
How does a mechanic diagnose the P0069 code?
A mechanic may diagnose the P0069 code by inspecting the circuitry of the manifold absolute pressure sensor and barometric pressure as well and the sensors themselves for any damages, loose connections, or shorts.
A mechanic may also connect a scan tool to the vehicle and drive it while observing live data. The mechanic would then use this data to verify the contradictory readings between these two sensors. If the powertrain control module is at fault, this may also be diagnosed by a high quality scan tool.
Common Mistake when diagnosing the P0069 code
Common mistakes when diagnosing this code would be skipping the diagnosis altogether and replacing either the manifold absolute sensor, barometric pressure sensor, or powertrain control module. Without verifying that they are faulty prior to replacing them.
How serious is the P0069 code?
Any condition that causes the engine to run poorly would be considered mildly serious. This condition is okay to drive on for a short period of time, but after an extended period, engine damage may occur. The car running improperly can cause abnormal wear to the engine block as well as vital engine parts. This issue can start out as a minor irritation but end up very troublesome.
What repairs can fix the P0069 code?
Repairs that can fix the P0069 code would include:
- Replacing the manifold absolute pressure sensor
- Replacing the barometric pressure sensor
- Replacing a clogged air filter
- Replacing the powertrain control module
- Repairing or replacing wiring that is related to this system
Additional comment regarding the P0069 code
It would be advised to replace the air filter as a basic maintenance service along with repairing this issue regardless of if the air filter was the initial cause.
The engine’s ability to breathe gets decreased every second that it is running due to the fact that it is constantly inhaling polluted air from the environment. All particles large enough to get caught in the air filter will cause a minor blockage in the air induction system. All of these minor blockages add up and could eventually lead up to a P0069 code.
Need help with a P0069 code?
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This article originally appeared on YourMechanic.com as P0069 OBD-II Trouble Code: Manifold Absolute Pressure/Barometric Pressure Correlation and was authored by Andrew Quinn.