The OBD2 code P0069 indicates a discrepancy between the Manifold Absolute Pressure (MAP) sensor and the Barometric Pressure (Baro) sensor readings, signaling potential issues with air intake or exhaust system pressures.
This can affect various vehicle makes and models, including Mitsubishi Outlander, Porsche Panamera, and Jeep Liberty, as demonstrated in the service cases. Such a condition can lead to illuminated malfunction indicator lamps (MIL), poor engine performance, and irregular fuel efficiency.
P0069 quick overview
| Meaning | P0069: Manifold Absolute Pressure/Barometric Pressure Correlation |
| Is it serious? | Yes, it can significantly impact engine performance and emissions. |
| Possible causes | – Faulty MAP sensor – Obstructions or leaks in the intake or exhaust system – Problems with the EGR system causing soot build-up – PCM software needing updates |
| How to diagnose? | Verify the operation of both the MAP and Baro sensors to ensure their readings align. Inspect the intake and exhaust systems for leaks or blockages. Check the EGR valve for soot accumulation and clean if necessary. Update the PCM software if updates are available and relevant to the issue. |
P0069 Meaning
When your car shows a P0069 code, it means there’s a mismatch between the air pressure the engine is seeing and the air pressure outside. This can mess with how your engine runs because it relies on precise air and fuel mixtures to work efficiently.
If the sensors that measure these pressures aren’t agreeing, it could be because of a blockage somewhere or a sensor might be failing. In some cars, like the Jeep Liberty, issues with the EGR system, which recirculates exhaust to help reduce emissions, can also cause similar problems. Getting to the bottom of this requires checking the sensors, looking for any leaks or blockages, and making sure the car’s computer is up to date.
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How to fix P0069 – learn from mechanics
I looked into P0069 service cases at iatn.com website where in the private forums the mechanics seek advice from other mechanics. I looked up a bunch of cases to help you decide how to fix your issue and see what would a real mechanic do to solve it.
Case #1: Mitsubishi P0069
Vehicle information
2005 Mitsubishi Outlander XLS 2.4L
Issue + repair history
- MIL lamp illuminated.
- Attempted to install new PCM.
- Conflicting information regarding initialization requirements for new PCM.
- Dealer suggested replacement of theft module and reprogramming, but TSB suggests otherwise.
Other OBD2 Codes + Test Results
- OBD2 Codes:
- P0401: Insufficient EGR detected
- P0069: Baro/MAP sensor
- Baro PID: 29.2-29.35 (constantly varying)
- Baro voltage: Steady
Mechanic suggestions
- Clarify requirements for PCM initialization, considering dealer advice and TSB.
- Verify if theft module replacement is necessary for PCM reprogramming.
- Seek further guidance from manufacturer or other experienced technicians.
Final fix
Dealer successfully initialized the new PCM without replacing the theft module, confirming that the TSB was accurate. Cleared the MIL lamp after resolving the PCM initialization issue.
Case #2: Porsche P0069
Vehicle information
2010 Porsche Panamera S 4.8L
Issue + repair history
- MIL lamp illuminated with code P0069.
- Throttle body cleaned and realigned previously, but issue recurred after a year.
- Throttle body found clean upon inspection.
- Intake smoke tested multiple times with no leaks detected.
- Air oil separator and oil filler cap replaced.
Other OBD2 Codes + Test Results
- OBD2 Codes:
- P0069: Pressure sensor signal comparison below limit value
- H040 readings in data stream:
- Ranging from +11-13 and fluctuating +20-22
Mechanic suggestions
- Monitor ECM ambient pressure and manifold pressure to check for agreement, especially during engine off.
- Use a scope to catch the issue in action and verify sensor behavior.
- Consider diagnostic conditions and possible fault causes listed for code P0069.
- Inspect connectors and lines for loose contact or corrosion.
- Check ground supply and intake manifold pressure sensor for faults.
Final fix
Identified a leak from the changeover valve in the rear intake during smoke testing. Replaced the valve, resolving the issue. Car has not returned since replacement.
Case #3: Jeep P0069
Vehicle information
2006 Jeep Liberty Limited 2.8L
Issue + repair history
- MIL lamp illuminated with codes P0069 (MAP/Baro correlation) and P1265 (Glow plug 3 control circuit low).
- Intake cleaning performed, but codes persisted.
- Glow plug 3 control circuit verified with ohms test.
- Running issue experienced where the vehicle wouldn’t rev over 3000 rpm, similar to a plugged exhaust. Resolved spontaneously after a few blocks.
- Previous shop apparently replaced MAP sensor.
- Intake elbow cleaned, found full of carbon and coking.
Other OBD2 Codes + Test Results
- OBD2 Codes:
- P0069: MAP/Baro correlation
- P1265: Glow plug 3 control circuit low
Mechanic suggestions
- Verify EGR valve for buildup of soot, as it was a common issue on these diesel vehicles.
- Consider performing an EGR cleaning and updating the PCM.
- Look into potential flash corrections for code P1265, as suggested by Identifix for the 2005 model.
- Troubleshoot any potential issues with the EGR system, given the running issue experienced.
- Check for any available aftermarket flash tools compatible with flashing the PCM, as Chrysler may restrict access to certain diagnostic information.
Final fix
Running issue resolved after cleaning the intake. Customer reported that the vehicle is running well, with no loss of power. Planning to clean the EGR and update the PCM as a preventive measure.
How to diagnose P0069
I made you an overview of solving this DTC, based on all the advice that was suggested by certified mechanics to address this issue in previously mentioned service cases.
| Diagnostic Step | Explanation |
|---|---|
| Inspect MAP and Baro sensors | Ensure both sensors are functioning correctly and providing accurate readings. |
| Check intake and exhaust systems | Look for any signs of leaks or blockages that could affect air pressure readings. |
| Evaluate the EGR valve and system | Check for soot build-up that could interfere with normal operation, particularly in diesel engines. |
| Update PCM software | If available, update the PCM to correct any software issues that might be causing the discrepancy. |
Car Diagnostics Training
- Car Electrical basics
- OBD-II scanner basics
- How to use an OBD reader
- Introduction to a Bi-directional Scan tool
- OBD scanner buyer’s guide + discounts
I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko