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Poor fuel consumption on a 2016 Passat Rline Turbo
10-03-2017, 04:06 PM
Post: #1
Poor fuel consumption on a 2016 Passat Rline Turbo
I just got a 2016 Passat Rline 1.8T and I'm confused about its fuel economy. Its rated as 25-38 MPG but I can swear the gage is moving faster than it should. Also, when accelerating from a complete stop, the consumption is below 10 MPG at least until it slips into 3rd gear. Any ideas?
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10-03-2017, 10:53 PM
Post: #2
RE: Poor fuel consumption on a 2016 Passat Rline Turbo
If you are trying to figure mileage based on a trip computer and watching the gauge, you will never be happy. Advertised economy figures are based on controlled situations and are for the buyer to make an informed choice, that's' all. If you want actual numbers for YOUR driving conditions then fill the tank, set the trip odometer, and take a ride. After several hundred miles fill it up again and do the math, the old fashion way. Under steady throttle conditions on a fairly flat road you may get somewhere close to the higher figure. Play with the gas and the gears and it will go down... sometimes quite a bit. Around town is going to vary a lot depending on your local roads, traffic, hills, average speed.

BTW, after you have driven the car for a month or two I bet the mileage changes... as YOU adjust to the car. It's human nature, that's all. (insert chuckle sound)
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10-04-2017, 05:36 AM
Post: #3
RE: Poor fuel consumption on a 2016 Passat Rline Turbo
Some other things to take into consideration are: How many miles is on it? Has it been wrecked? Any lights on the dash on...Check Engine, Service Engine? Are any of the brakes sticking? Lack of power? Strong "rotten egg" smell from exhaust?

If there isn't anything obvious I would do an actual mileage check as Rupe suggested.

Thanks for using the forum,
Garner

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10-04-2017, 12:29 PM
Post: #4
RE: Poor fuel consumption on a 2016 Passat Rline Turbo
(10-04-2017 05:36 AM)Garner Wrote:  Some other things to take into consideration are: How many miles is on it? Has it been wrecked? Any lights on the dash on...Check Engine, Service Engine? Are any of the brakes sticking? Lack of power? Strong "rotten egg" smell from exhaust?

If there isn't anything obvious I would do an actual mileage check as Rupe suggested.

So it was in a wreck recently and had been repaired but I still run a "P0238" code when I scan with an OBDII, with the "check engine" lights and "EPC" on. The airbags have been replaced but the lights haven't been cleared. I'm still getting used to the brakes so I don't think they are acting funny but I do smell a faint odor of exhust when accelerating from a complete stop, not rotten egg smell though.
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10-04-2017, 09:06 PM (This post was last modified: 10-04-2017 09:58 PM by Rupe.)
Post: #5
RE: Poor fuel consumption on a 2016 Passat Rline Turbo
here's what I have on that code...

What the P0238 code means
P0238 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost pressure sensor A input circuit out of specifications, indicating an open circuit or high voltage condition in the circuit.
What causes the P0238 code?
Turbo boost pressure sensor internally open circuit
The turbo boost pressure sensor A connector is damaged, causing an open circuit
The turbo boost pressure sensor A wiring is shorted to power between the sensor and the ECM

The EPC light tells me there's an issue with the traction control, which the ECM may be holding hostage due to the engine light being on.

More on that:

The EPC light on a Volkswagen stands for Electronic Power Control, and it is used to indicate problems in the engine. Ideally, it refers to the drive-by-wire system that prevents a car from skidding and spinning on slick surfaces

BTW, boost control could be related to a damaged crank sensor from when the car was crashed. You'd need a full function scanner to find that first, then see if the EPC light goes off.
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10-06-2017, 06:32 PM
Post: #6
RE: Poor fuel consumption on a 2016 Passat Rline Turbo
Now; with all the extra information, this is very interesting. You actually may be using extra fuel due to the other issues. I hope that you can take a few minutes to keep us posted as to what you find and if you get better gas mileage after making the repairs.

Since the car was wrecked, make sure the alignment is correct. If you notice it pulling to one side or unusual tire wear the alignment may be off. This can also cause extra fuel consumption.

Thanks for using the forum,
Garner

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10-06-2017, 06:46 PM
Post: #7
RE: Poor fuel consumption on a 2016 Passat Rline Turbo
Something I missed earlier is about the air bags. If the light is on then the system will not function despite the bags being replaced. Also, even if the air bag light was cleared, it will come back on if the system still has an issue. If replacing the bags was all it needed, then the air bag light would go off, but there may still be a code in storage. Bottom line here is the lights would be off and things would be working correctly if everything was repaired properly.
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10-24-2017, 02:25 PM (This post was last modified: 10-24-2017 02:26 PM by Daavi.)
Post: #8
RE: Poor fuel consumption on a 2016 Passat Rline Turbo
(10-06-2017 06:46 PM)Rupe Wrote:  Something I missed earlier is about the air bags. If the light is on then the system will not function despite the bags being replaced. Also, even if the air bag light was cleared, it will come back on if the system still has an issue. If replacing the bags was all it needed, then the air bag light would go off, but there may still be a code in storage. Bottom line here is the lights would be off and things would be working correctly if everything was repaired properly.

I have been able to run a VCDS Diagnostics and this is the results I got for the airbags and engine. Can anyone explain to me what they mean and what to do next?
.jpg  AIRBAG_CODES_Page1.jpg (Size: 122.65 KB / Downloads: 2)
.jpg  AIRBAG_CODES_Page2.jpg (Size: 102.61 KB / Downloads: 2)
.jpg  ENGINE_CODE_Page1.jpg (Size: 82.75 KB / Downloads: 4)
.jpg  ENGINE_CODE_Page2.jpg (Size: 212.75 KB / Downloads: 4)
.jpg  ENGINE_CODE_Page3.jpg (Size: 120.97 KB / Downloads: 3)

(10-24-2017 02:25 PM)Daavi Wrote:  
(10-06-2017 06:46 PM)Rupe Wrote:  Something I missed earlier is about the air bags. If the light is on then the system will not function despite the bags being replaced. Also, even if the air bag light was cleared, it will come back on if the system still has an issue. If replacing the bags was all it needed, then the air bag light would go off, but there may still be a code in storage. Bottom line here is the lights would be off and things would be working correctly if everything was repaired properly.

I have been able to run a VCDS Diagnostics and this is the results I got for the airbags and engine. Can anyone explain to me what they mean and what to do next?


.jpg  ENGINE_CODE_Page4.jpg (Size: 60.29 KB / Downloads: 2)
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10-24-2017, 10:36 PM
Post: #9
RE: Poor fuel consumption on a 2016 Passat Rline Turbo
I have been running lots of OT on my day job so I won't be able to fully digest this tonight. Maybe Garner can pitch in till I gather my grey matter into one place.
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10-25-2017, 06:04 AM (This post was last modified: 10-25-2017 06:06 AM by Garner.)
Post: #10
RE: Poor fuel consumption on a 2016 Passat Rline Turbo
At a glance; as I am limited on time today also, I would be looking for a damaged wiring harness. Everything that I read points to shorts in the electrical system. Possibly when the car was wrecked the wires got pinched, stretched, melted... It seems unlikely that so many individual items would be damaged. Much more likely that the harness is damaged. I am trying to dig up some code explanations for you. I did some reading on the Air Bag codes and they also were pointing to damage in the wiring for the Seat Belt sensors. This could occur in the accident itself or in the shop as they made repairs. If the repair shop was cutting, welding, and/or drilling they could have easily damaged the wires. Even just removing the shoulder strap bolts on the seat belts can allow excessive movement and cause damage to the sensor, pull a connector apart, or stretch a wire to the breaking point. The codes are pointing to the shoulder strap sensor wiring.

I am having trouble finding any good information on the P1946 code. What little I can find points toward the wiring harness again. It says to look for damaged connectors and wiring.

I hope this helps. I have one of my own cars broke down in a parking lot so I am pressed for time to go repair it.

U1123, https://www.engine-codes.com/u1123.html

P0238, https://www.yourmechanic.com/article/p02...ay-safford

Please keep us posted. I am very curious as to what you will find!

Thanks for using the forum,
Garner

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