6.7L MAP Sensor Repeat Failures

4811 Views 7 Replies 5 Participants Last post by FordDoctor, 3 d ago

F350-Dani

Discussion Starter · May 18, 2022

I have a 2018 F-350 6.7L. I have had three significant problems with this truck thus far, and all might be related, but I don't suspect so. My question is has anyone else had to replace their MAP sensor multiple times at less than 100k??

Timeline of all events:
41,750 - P2074 DTC, cleaned MAP sensor
42,650 - Discovered completely corroded passenger-side positive battery terminal. Replaced batteries (Motorcraft BXT65-850's) and terminal.
43,750 - P2074 DTC, cleaned MAP sensor
47,450 - P2074 DTC, replaced MAP sensor with Standard AS434 (Standard is the brand at Oreilly's)
Consistent minor electrical issues continue through this period. Examples: interior lights surge after engine start, Pre-collision assist unavailable, hill-start assist unavailable, cruise-control inoperative.
63,700 - "Reduced Engine Power" and DTCs: P00BD, P1247, P2A01. Replaced MAP sensor with another Standard AS434.
80,800 - After asking for dealership to troubleshoot my electrical issues while performing recall work, discover that the Passenger Battery is at 10.8V after overnight charge. Replace BOTH batteries again under warranty with BXT65-850's.
89,050 - "Reduced Engine Power" and DTCs: P0234, P0069, B11F0. Replace MAP Sensor with a third AS434.

Every time I've replaced the MAP Sensor it fixes my check-engine-light problems. Has anyone else had to replace this many MAP Sensors, or have any thoughts about what could be a root cause? I know it's hypothetically possible that this is solely related to electrical problems, but I have the last 8,000 miles with zero DTCs and brand new batteries that have shown good voltage every time I checked. I'm looking for alternative ideas that I can investigate before I'm burning my hands again at a rest-stop while trying to tow for 1k miles.

One thing I haven't done is check my individual battery voltages tonight. I last checked at 87,000 miles and both were fine, about 0.1V difference.

Any thoughts or experiences are greatly appreciated! Thanks for reading if you made it this far

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CarParts.com

· #2 · May 23, 2022

Hello,

There's definitely an underlying problem. All of those MAP sensors haven't gone bad. Is your truck stock?

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F350-Dani

Discussion Starter · #3 · May 23, 2022

CarParts.com said:
Hello,

There's definitely an underlying problem. All of those MAP sensors haven't gone bad. Is your truck stock?

Yes, 100% OEM components. Only thing that isn't 'stock' is a couple of ForScan mods for headlights and DPF screen on the instrument cluster, but that didn't change any hardware.

Also, I did check the voltages on each battery again, they're at 12.77 and 12.69 V.

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CarParts.com

· #4 · May 23, 2022

F350-Dani said:
Yes, 100% OEM components. Only thing that isn't 'stock' is a couple of ForScan mods for headlights and DPF screen on the instrument cluster, but that didn't change any hardware.

Also, I did check the voltages on each battery again, they're at 12.77 and 12.69 V.

It sounds like your truck might have some kind of a breathing problem. A couple of those are turbocharger boost codes and boost has a direct input on the MAP reading. There is also a TSB for P2074, which recommends a software update to get rid of the code, but you don't have the code anymore. I would recommend looking at the live data (if possible) or at least the freeze frame data these codes set. You might notice something that jumps out at you, like desired and actual boost pressures that don't match. Alternately, you could have a shop diagnose the problem for you.

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GregWork

· #5 · May 24, 2022

You need Ford OEM parts for sensors. 3rd party sensors nearly always cause problems.

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F350-Dani

Discussion Starter · #6 · May 24, 2022

CarParts.com said:
It sounds like your truck might have some kind of a breathing problem. A couple of those are turbocharger boost codes and boost has a direct input on the MAP reading. There is also a TSB for P2074, which recommends a software update to get rid of the code, but you don't have the code anymore. I would recommend looking at the live data (if possible) or at least the freeze frame data these codes set. You might notice something that jumps out at you, like desired and actual boost pressures that don't match. Alternately, you could have a shop diagnose the problem for you.

Appreciate that. I did take forscan recordings both with the bad sensor and new sensor. I'll take a look at the specifics you mentioned!

I might buy a Motorcraft sensor to keep in the glove box for the next time I have one fail on me.

Is it normal to have a lot of soot on the inside of these? I'm assuming so based on the location.

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jd.ROUSH-SD

· #7 · 3 d ago

Did you ever find a solution? I am having the same issues with ford sensors. Replaced map and did reset process. Next was nox 1/1. Replaced. Worked a week. I am on my third map sensor in 2000 miles., current code says map sensor again. Truck has 45k on it.

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FordDoctor

· #8 · 3 d ago (Edited)

jd.ROUSH-SD said:
Did you ever find a solution? I am having the same issues with ford sensors. Replaced map and did reset process. Next was nox 1/1. Replaced. Worked a week. I am on my third map sensor in 2000 miles., current code says map sensor again. Truck has 45k on it.

What is the code?

Thinking out loud here... if multiple replacement sensors do not correct the concern, then maybe the sensor is not the root cause. If this is a P2074 like the OP has, the code means that the sensor value does not match the parameters set in the PCM based on other sensor data. MAF sensor concerns in particular may cause this. MAF readings that are incorrect can be caused by quite a few things starting with circuit concerns, the sensor itself (include dirty sensor) air leaks and restrictions from the air filter to the intake gaskets, exhaust restrictions, EGR concerns and excessive carbon inside the intake manifolds, upper and lower.

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