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Old 11-11-2011, 01:55 PM
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P0069 question..

My truck is and has been showing a P0069 code for a little while. Is it more likely that the MAP sensor went out then the BARO? Will or would this cause any issues with the truck?

Thanks!
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Old 11-12-2011, 09:00 AM
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No one as any ideas?
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Old 11-12-2011, 02:31 PM
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I would check the rubber hose coming off the intake going to the MAP sensor for any nicks, slices or holes. Pull the hose off the intake manifold. Using an allen wrench about the same size as the hole in the nipple (so it won't drop into the manifold if dropped) and poke the hole to make sure it is clear of any soot build up. Then check the sensor plug just to be sure it is properly set and connected.

If the code persists, and you can access the PID's for the MAP and BARO sensors, there are a few tests you can do to determine what is going on.

Key on, engine off
Access the baro and map PID's
Verify that the BARO PID reading is approx the same as the barometric pressure reading for the location, day and altitude where the vehicle is being serviced.
Does the BARO PID reading compare with the daily barometric report for the local area?
If no, install a new BARO, clear the DTC, repeat the test
If yes:
Key on, engine running
Access the BARO and MAP PID's
Compare BARO and MAP values with the 'key on, engine off' value.
Is the baro PID value equal to the recorded value?
If not, install a new BARO. Clear the DTC and repeat the test.
If it is the same:
Key on, engine running
Access the BARO and MAP PID's.
Compare the BARO and MAP value with the 'key on, engine off' value.
Is the MAP sensor reading within 30kPa (4.3 psi) of the BARO reading?
If no, check the hose for damage. If you do not find any damage, replace the MAP sensor.
If the values are within 30kPa (4.3 psi), disconnect all PCM connectors.
Visually inspect for pushed out pins and corrosion.
Connect all the pcm connectors and make sure that they are seated correctly.
Carry out the PCM self tests and verify the concern is still present.
If it is not, congratulations on your successful repair.
If it is, Install a new PCM.

Last edited by NYC F-350; 11-12-2011 at 02:32 PM. Reason: typos!
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Old 11-12-2011, 02:39 PM
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Another thing to monitor is EBP readings. KOEO it should read close to MAP and baro readings. If it's not close inspect EBP sensor and wiring. Pull the EBP sensor connector and check for signs of corrosion.

I just had a truck that drove me nuts that had the same P0069 code. I tried a different MAP and baro sensor and still had the code. Long story short I had an issue with the EBP sensor wiring. As soon As I fixed that the code went away.
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Old 11-12-2011, 03:01 PM
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Cool, thanks guys I'll look into having my local shop check out the pids( since I don't have a way to monitor those). Also, I went and returned my truck back to stock tuning(damn snow and ice) and the code went away.. So I think it maybe something in the tune as well..
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