DTC P026A. '2011 F250 6.7L Turbo Diesel - Diesel Forum - TheDieselStop.com
6.7L Power Stroke Engine and Drivetrain Discussion of the 6.7L Power Stroke diesel engine and drivetrain in the 2011-Up Super Duty trucks. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.7L Power Stroke engine.

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post #1 of 4 (permalink) Old 05-06-2018, 06:34 AM Thread Starter
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Exclamation DTC P026A. '2011 F250 6.7L Turbo Diesel

I'm starting to reconsider my diesel purchase. It seems like every month I have some little DTC that pops up. The truck runs great but I want to stay on top of these things and it's frustrating. I no more than corrected a faulty EGT sensor and now this code:

P026A - Charge Air Cooler Efficiency Below Threshold.

1. I want the best DIY Repair manual! Recommendations please!!
2. Can anyone tell me where the darn sensor is for the air charge cooler?
3. What would be my best approach to ridding myself of all these DTCs? I mean would bulletproofing do the trick?

If I wasn't bald, I'd pull out a few strands right about now.

Rant over.......Jess:
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post #2 of 4 (permalink) Old 05-06-2018, 07:35 AM
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Charge air cooler is the inter cooler.

Charge Air Cooler Monitoring

The 6.7L engine is equipped with an air to water charge air intercooler. The CAC is on a secondary coolant loop, independent from the main engine coolant system. The temperature at the outlet of the cooler is measured as TCACDs, however the temperature going into the cooler is modeled.

To detect a CAC under cooling situation, the efficiency of the cooler is modeled at various speeds and airflows via a 3d speed/airflow multiplier table, providing a modeled cooler out temperature. Cooler efficiency * compressor out temperature = modeled cooler out temp. This modeled cooler out temp is then compared to the measured coolant out temp, if the difference is less than a threshold curve or greater than a threshold, a fault is detected and a P code is set.

Charge Air Cooler Monitor:

DTCs P026A - Charge Air Cooler Efficiency Below Threshold
P007E - Charge Air Cooler Temperature Sensor Intermittent/Erratic (Bank 1)

Monitor Execution Continuous

Monitor Sequence None

Sensors OK ECT, MAP, MAF

Typical Monitoring Duration 4 seconds for fault detection

Have you checked to see if you have a tube going to and from the inter cooler that is leaking? The 'cold air' return tube is know to rupture. Many install an aftermarket CAC return tube. I installed the kit from Rudy's. It is also possible the inter cooler is leaking.


2015 F350 Ultra Lariat 6.7L CCLB DRW 3.73 Limited Slip, Green Gem Metallic w/ Caribou accent, Camper Package, Titan 65gal tank, Rapid Heat, Block Heater, Upfitter Switches, Dual Alternators, Camper Package, Cable Lock, Husky Floor Liners, Spray in Bedliner, 5th Wheel Prep, 25K 5th Wheel Hitch, Ford Goose Neck Hitch.

Traded 2011 F350 XLT CCLB SRW 6.2L gasser 6,000 miles for 2015

Sold 1996 F350 XLT CCLB DRW 7.3L 208,000 miles

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post #3 of 4 (permalink) Old 05-06-2018, 09:54 AM
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Originally Posted by Jesse C110700 View Post
P026A - Charge Air Cooler Efficiency Below Threshold.

Check the coolant level in the secondary cooling system reservoir...
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post #4 of 4 (permalink) Old 05-07-2018, 06:43 AM Thread Starter
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Larrgh // ford_doctor ...Thanks for the detailed description. I have checked and have no Leakes. However I was able to put a full container of coolant in the secondary reservoir. Now it's back to the cold fill line. I've deleted the DTC and will drive it today to work. I'm hoping that this is the cause. Not TOO worried about a coolant leak given the fact that I had one recently and a it was repaired. However, it was one of the coolant lines for the turbo. I'm not sure, without looking, what cooling system that is. Geez these new diesels are far more complicated than the old Army CAT I'm used to working on. Gone are the days of simplicity.

Thanks again!

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