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Poor fuel consumption on a 2016 Passat Rline Turbo
10-25-2017, 10:00 AM
Post: #11
RE: Poor fuel consumption on a 2016 Passat Rline Turbo
Just a quick pointer before I run out the door early.

Hopefully the repair work was done be a reputable shop that will stand behind their work. I think back to years ago when my son had a "friend" repair his vehicle on the cheap after a rear-ender. It looked good but instead of pulling the back hatch area straight, they shimmed the hinges and latch. Bottom line was a poor fit and exhaust was leaking into the passenger compartment. This is what happens when people take short cuts.
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10-25-2017, 04:19 PM
Post: #12
RE: Poor fuel consumption on a 2016 Passat Rline Turbo
(10-25-2017 06:04 AM)Garner Wrote:  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!

So when I got all the wrecked parts replaced, the car wouldn't start so I took it to the VW dealearship and they diagnosed the Engine Wiring Harness and Altenator harness as faulty so I let them replace it and the car started. I let my mechanic take the seatbelts out and I sent them off to be restored and replaced the airbag but haven't messed with anything else, including the turbo which doesn't get enough boost at all on hills. I get about 60 MPH @ 4000 RPM on steep hills.
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10-25-2017, 10:24 PM
Post: #13
RE: Poor fuel consumption on a 2016 Passat Rline Turbo
I would say that there is still more wiring damage. If you look at the symptoms for a P0238 code in the article I posted, it says that the computer can turn the boost "OFF" due to faulty readings. It also says to look for damaged wires. So it is very likely that there are still more wires that need fixed.

Thanks for using the forum,
Garner

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10-25-2017, 10:47 PM
Post: #14
RE: Poor fuel consumption on a 2016 Passat Rline Turbo
Would agree with Garner here. If you go back 3 weeks ago I mentioned similar issues where the ECM doesn't follow the normal routine when there are other problems. IOW, it goes into a default mode so you can limp home with limited power.

BTW, if the check engine light is flashing you may be doing damage to the cat converter, which is an expensive item to replace... and can cause you more trouble shooting issues. (insert emocon for head banging and hair pulling)
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10-26-2017, 05:48 AM
Post: #15
RE: Poor fuel consumption on a 2016 Passat Rline Turbo
I have a few minutes today and thought that I would comment on the seat belts. You said that you had your mechanic take them out. If he took the bolts out of the shoulder harness he may have pulled the sensor wires loose or damaged them. If there is a problem with the seat belt sensors it affects the air bags. And the codes you had were pointing to the shoulder harness sensor.

Thanks for using the forum,
Garner

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