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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW Passat Family (NMS and B7) TDIs (2012+)

VW Passat Family (NMS and B7) TDIs (2012+) Discussion area for the 2012+ Passat TDI (North American and rest of world versions versions). The North American model was previously codenamed NMS (New Midsize Sedan) and the version the rest of the world gets is sometimes referred to as B7.

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Old December 26th, 2016, 15:42   #1
JETaah
 
Join Date: Jan 2001
Location: mi 48836
Fuel Economy: 53 max, 42 min, average 46
Default Another thread regarding the " P026A 00 [237] - Efficiency Below Threshold" code

Yup, like it says.
EDIT:
model year corrected

The car is a 2014 Passat and it is getting the below code:

12642 - Charge Air Cooler
P026A 00 [237] - Efficiency Below Threshold
MIL ON - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 141822 km
Date: 2031.14.31
Time: 13:39:33

Engine speed: 1535.00 /min
Normed load value: 51.8 %
Vehicle speed: 81 km/h
Coolant temperature: 77 °C
Intake air temperature: 63 °C
Ambient air pressure: 990 mbar
Voltage terminal 30: 14.260 V
Unlearning counter according OBD: 40
Air mass at air mass meter 1: 99.0 kg/h
Temp sensor for low-pressure EGR after cooler: raw value: 67.5 °C
Outside air temperature: 1.5 °C
Intake air temperature before throttle valve: calculated: 27.2 K
Sensor for temp after charge air cooler: raw value: 63.7 °C
Coolant pump for charge-air cooling: spec. value: 95.00 %
============
From what I have read in all the threads, it seems like the cause was due to having a winter front installed and that prevented air flow from creating enough difference between the in and out of the intercooler.
There is no winter cover on this car. So what gives?

Could it be the intercooler's coolant pump? Looks like it is at 95%
Does that mean it is almost full on?

What kind of measurement is the 27.2K ?
i.e.,
Intake air temperature before throttle valve: calculated: 27.2 K
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Last edited by JETaah; January 3rd, 2017 at 14:06.
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Old December 31st, 2016, 05:42   #2
Rico567
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We have used the idparts winter fronts on our '13 Passat since new and have never had a problem.
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Old December 31st, 2016, 06:43   #3
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Quote:
Originally Posted by Rico567 View Post
We have used the idparts winter fronts on our '13 Passat since new and have never had a problem.
But, there have been more than a few that have had problems.
That will not be the problem on this car.
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Old December 31st, 2016, 19:30   #4
dbias
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Quote:
Originally Posted by Rico567 View Post
We have used the idparts winter fronts on our '13 Passat since new and have never had a problem.

Its a 2015? not comparable to a 2013 at all.
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Old January 2nd, 2017, 13:37   #5
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does the 2015 passat have a grille shutter? if so, you should be able to operate it with VCDS.
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Old January 2nd, 2017, 14:01   #6
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Quote:
Originally Posted by meerschm View Post
does the 2015 passat have a grille shutter? if so, you should be able to operate it with VCDS.
I did not see anything to that effect in the output tests.
One thing I did notice today is that the aux coolant pump runs a long time after the engine is off.
And, the pump did not shut off while performing an output test on/off sequence .

I could see that if a temp sensor is reading high that it would cause the pump to run until it satisfied the programming. The only temp sensor that I see is just past the intercooler right near the intake flap.
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Old January 3rd, 2017, 04:32   #7
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Things to check:

1.) Air blockage/restriction through the intercooler's radiator (winter front, excessive accumulation of road debris/dirt, bad cooling fan(s), etc.)
2.) Coolant blockage in the intercooler (air lock, bad pump, etc.)
3.) Bad intake air temperature sensor

Is this 2015 still under warranty?
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Old January 3rd, 2017, 08:02   #8
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Not under warranty anymore. 88K miles.
Does it have it's own radiator in front of the engine rad?
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Old January 3rd, 2017, 08:08   #9
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Never mind....I found it.
http://nemiga.com/cat_spares/etka/vo...a/691u/121600/

Got it's own radiator and shares the reservoir w/ the engine.
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Old January 3rd, 2017, 08:59   #10
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Correct. Separate radiator that shares the same reservoir. The two coolant circuits operate in an isolated fashion normally - the connection is just there for filling/priming.

I'm not sure if that diagram is completely accurate for the 2015 Passat. I believe the intercooler is a different design and is mounted differently than depicted there. I could be wrong though - I haven't looked at a 2015 Passat TDI in a while.
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Old January 3rd, 2017, 09:21   #11
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The intercooler on the car looks pretty much dead-on like the illustration.
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Old January 3rd, 2017, 10:08   #12
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I'd suggest trying to get the intercooler pump to run with the engine off (perhaps there's an output test for this?) and listening for the motor / coolant flow.

How's the heat in the car? Is it as warm on the passenger side as the driver's side?

-J
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Old January 3rd, 2017, 12:27   #13
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I believe there is some clarification needed on how the intercooler is set up.

2012 to 2014 NMS Passats have the EA189 engine family that has the CKRA engine code. The intercooler looks like the diagram in the link. The intercooler is a separate unit that bolts to the intake manifold. I believe the CKRA intake manifold is made out of plastic.

2015 Passats have the latest EA288 family of engines that has a CVCA engine code. While looking very similar to the CKRA engine it has quite a few differences including the intercooler. The intercooler is cast as part of the intake manifold and is all cast in aluminum. Here is a pic of the CVCA intercooler.



If this is indeed a 2015 with the intercooler shown in the link, it's a CKRA engine. I was under the impression that all 2015s used the newer CVCA engine. But this is VW and they could have built some early 2015s with the CKRA engine.

Unfortunately this information does not help diagnose/resolve the problem. My thinking follows that to see an intercooler code one should see a very high coolant temp first. I can only imagine what a PITA back flushing the intercooler would be.

I too also use an IDParts grill cover on my 2014. There have been ZERO issues with it on the car. I have had a few oddball warm days in late winter where the temps reached 60F and the engine ran just fine. Coolant temps were always within the normal range ~210F per Scangauge-II.

Good luck.
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Old January 3rd, 2017, 13:48   #14
JETaah
 
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Default

Well..........
My Bad!
Apparently this is a 2014 car..."E" letter code in the VIN.

I corrected this in the first post.
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Last edited by JETaah; January 3rd, 2017 at 14:25.
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Old January 3rd, 2017, 14:23   #15
JETaah
 
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Quote:
Originally Posted by compu_85 View Post
I'd suggest trying to get the intercooler pump to run with the engine off (perhaps there's an output test for this?) and listening for the motor / coolant flow.

How's the heat in the car? Is it as warm on the passenger side as the driver's side?

-J
The coolant pump works audibly and I can feel it in the hoses.
As stated above, I shut the car off and did the output test for the pump.
At that time, the pump was still after-running and the test did not override the sequence to turn it off on command via the output test.

And, Yes, I first saw this car a year ago and the owner did have the complaint about the uneven cabin heat. I referred him to the VW dealer for help on that one. I don't know if he had anything done about it.
Was this known to cause trouble in more than the heater core itself?
I suppose that since it shares coolant with the engine/climate control, any crap that was produced could have migrated to the intercooler circuit. Good thought!
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Last edited by JETaah; January 4th, 2017 at 04:42.
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