Skipping, crazy

gmfain

Well-known member
Joined
Jun 12, 2006
Location
Calhoun, GA
TDI
2015 Jetta TDI S
Something strange, 2015 Jetta CVCA, I'll be cruising along, and it cuts out for a second, then its fine. It does this randomly. I thought water in fuel, but I'm on tank 5, still doing it. Changed fuel filter still doing it. No CEL, No codes. Its baffled me. Anyone experienced it? ran two different fuel sources, no change.
 
Last edited:

wonneber

Top Post Dawg
Joined
Oct 12, 2011
Location
Monroe, NY, USA
TDI
2014 Jetta Sportwagen, 2014 Tiguan,2003 Jetta 261K Sold but not forgotten
Long shot.
Try scanning for codes right after it happens and before shutting the car off.
 

gmfain

Well-known member
Joined
Jun 12, 2006
Location
Calhoun, GA
TDI
2015 Jetta TDI S
Long shot.
Try scanning for codes right after it happens and before shutting the car off.
Thanks, I will try that.

I filled up this week with Exxon Mobile's premium diesel, no change, still random skipping....
 

oilhammer

Certified Volkswagen Nut & Vendor
Joined
Dec 11, 2001
Location
outside St Louis (where it's safe)
TDI
There are just too many to list....
How are you checking for DTCs? Generic stuff won't tag everything like VCDS or something that speaks proper Volkswagen can.

Something else to try: whenever the conditions are present that it has done the "skipping", leave the engine running and open the hood and carefully wiggle around any part of the engine wiring harness you can easily access. There is a lot of stuff crammed in there, so you may not be able to get to much, but I have found many engine harness issues on other VAG products like that (but never on the 2015 CVCA engine...yet).
 

DuncanTDI

New member
Joined
Oct 22, 2020
Location
Canada
TDI
MkVI Jetta CJAA
Following. I just bought mine used and it's doing the same thing. Not very often. New vagcom is still on route so I haven't been able to dig into it, but using two more generic bluetooth OBD2 dongles doesn't find any codes. Haven't tried checking after it happens before shutdown as i figured if something was logged a freeze frame of it would stick around. Will try that next time I notice it.
 

TheFonz

Well-known member
Joined
May 21, 2008
Location
Mississauga, ON
TDI
2012 VW Jetta TDI
I've been experiencing the same thing the last few months. What I notice is that is mainly happens when I'm in 3rd gear between 50 & 60 km/h at or just below 2000 rpm. I've cleaned the MAF sensor, changed the air filter, and changed the fuel filter with no change. No warning lights or anything.

Edit: My vehicle is a 2012 Jetta 6-speed manual
 
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gmfain

Well-known member
Joined
Jun 12, 2006
Location
Calhoun, GA
TDI
2015 Jetta TDI S
Its a long shot, but I'm going to try and call up some VW service departments and try and pick there brain. I'll post the results.

My journey so far:
2015 CVCA 122K timing belt done @120K ( skipping before and after timing belt, fyi)
4 different fuel sources, still skips
fuel filter change, still skips
Cold snap, hot snap, still skips
low speed, high speed, still skips
 

gmfain

Well-known member
Joined
Jun 12, 2006
Location
Calhoun, GA
TDI
2015 Jetta TDI S
Update on Dealer call. After explaining my situation, plus my Google review after we hang up....... He talked to his guys in the shop about it, and called me back. No one has reported that happing to them, so without codes/data he was at a loss on cause. This was Jim Ellis dealer in Chamblee GA. At least the tried to help me. I give them a good review for that.........

I will try another dealer too.

In the meantime, going to have battery and alternator tested too. (new duralast gold May 19, 2019, 5ye3yr)
 

gmfain

Well-known member
Joined
Jun 12, 2006
Location
Calhoun, GA
TDI
2015 Jetta TDI S
Ok, yesterday I had time to check/wiggle/push all the connection I could see/find.... with the engine running. No change.

Skipping a few times on the way in this morning, like normal.....BaHaHaHa......it should not be normal...LOL

1.Hoping to have time to call a couple stealers today.
2. Added VAG-com to budget, top of list.
 

oilhammer

Certified Volkswagen Nut & Vendor
Joined
Dec 11, 2001
Location
outside St Louis (where it's safe)
TDI
There are just too many to list....
Calling a dealer isn't going to help you, and you'll just be wasting their time on the phone. If you want one to look at your car, make an appointment to bring the car in, and INSIST that you are able to drive the car with the service writer when you bring it in (assuming the car will do it with enough regularity that you can show him/her what exactly is happening).

Now if it is something that happens a few times over the span of an hour's worth of driving, it may not be feasible to do that. In which case, you'll be left with the technician test driving the car for a "reasonable" period of time to try and reproduce the complaint. Otherwise all that is left is some OBD sleuthing and perhaps some visual checks.

Problems like this can be hard to pin down, and may require some gut instincts to look into things that *could* cause the problem, like a flaky CKP sensor signal that can only be viewed by human eyes through the use of a scope.
 

gmfain

Well-known member
Joined
Jun 12, 2006
Location
Calhoun, GA
TDI
2015 Jetta TDI S
Point taken.

I really believe from my observation so far its related to the regen.

That said. Does anyone know what I will be able to see/monitor with VAG-COM software in regards to the regen?

I hate to drop $200, for nothing.

thanks
 

gmfain

Well-known member
Joined
Jun 12, 2006
Location
Calhoun, GA
TDI
2015 Jetta TDI S
Footnote: I am going to try the VAG DPF app, to monitor the regens before getting VAG-COM .......(adapter is only $29)(( app is $4.69))
 

gmfain

Well-known member
Joined
Jun 12, 2006
Location
Calhoun, GA
TDI
2015 Jetta TDI S
Of course never skipped this am. went through regen cycle on my way in to work. All looks normal


Save date(yyyy-MM-dd HH:mm:ss): 2020-11-03 03:14:27 / Application Release: VAG DPF v.3.16.8 / Log Format: 1.3
Time (ms) Soot Mass Calc. (g) Regen. Duration (min) Distance Since Last Regen. (mi) Time Since Last Regen. (min) Oil Ash Residue (g) Low Press. EGR Closing (%) DPF Input Gas Temp. (°F) DPF Output Gas Temp. (°F) Soot Mass Measured (g) Post injection 2 (mg/str) Post injection 3 (mg/str) Differential Pressure (hPa) Distance driven (mi)
1604391267494 20.22 0 242 309 44.6 121 73 10.18 0.00 0.00 30 123806
1604391873123 20.97 0 252 319 44.6 684 637 10.55 0.00 0.00 123 123815
1604391913181 21.03 0 253 319 44.6 720 640 10.49 0.00 0.00 144 123816
1604391965997 21.08 0 254 320 44.6 679 666 10.36 0.00 0.00 169 123817
1604392012967 21.15 0 255 321 44.6 713 649 10.29 0.00 0.00 128 123818
1604392084754 21.20 0 255 322 44.6 692 645 10.35 0.00 0.00 161 123819
1604392135323 21.25 0 256 323 44.6 661 654 10.29 0.00 0.00 140 123820
1604392194888 21.33 0 257 324 44.6 697 640 10.21 0.00 0.00 144 123820
1604392252898 21.39 0 258 325 44.6 734 650 10.16 0.00 0.00 158 123822
1604392362401 21.47 0 260 327 44.6 830 765 10.02 0.00 0.00 237 123824
1604392368988 21.47 0 260 327 44.6 841 777 9.99 0.00 0.00 218 123824
1604392435336 21.52 0 261 328 44.6 636 699 9.77 0.00 0.00 141 123825
1604392499443 21.59 0 263 329 44.6 732 636 9.72 0.00 0.00 177 123826
1604392561190 21.65 0 264 330 44.6 719 680 9.64 0.00 0.00 224 123827
1604392736976 21.76 0 267 333 44.6 606 648 9.82 0.00 0.00 256 123830
1604392795403 21.80 0 268 334 44.6 651 631 9.89 0.00 0.00 155 123832
1604392879885 21.89 0 269 336 44.6 604 624 9.99 0.00 0.00 35 123833
1604392944590 21.93 0 271 337 44.6 745 697 9.96 0.00 0.00 241 123834
1604393017320 21.99 0 272 338 44.6 779 717 9.77 0.00 0.00 258 123835
1604393116130 22.09 0 274 339 44.6 680 686 9.54 0.00 0.00 71 123837
1604393137467 22.11 0 274 340 44.6 565 671 9.54 0.00 0.00 170 123838
1604393208441 22.19 0 276 341 44.6 684 609 9.60 0.00 0.00 186 123839
1604393301546 22.29 0 278 343 44.6 652 602 9.63 0.00 0.00 164 123841
1604393364875 22.35 0 279 344 44.6 547 595 9.70 0.00 0.00 223 123842
1604393446285 22.43 0 281 345 44.6 616 577 9.83 0.00 0.00 234 123844
1604393546830 22.51 0 282 347 44.6 692 599 10.03 0.00 0.00 85 123846
1604393659245 22.58 0 284 348 44.6 705 658 10.12 0.00 0.00 113 123847
1604393731965 22.65 0 285 350 44.6 617 636 10.15 0.00 0.00 61 123848
1604393796514 22.68 0 286 351 44.6 605 590 10.30 0.00 0.00 143 123849
1604393845117 22.73 0 287 352 44.6 1045 691 10.34 7.86 2.22 138 123850
1604393863675 22.70 1 287 352 44.6 1088 741 10.23 4.67 2.46 160 123850
1604393930772 21.89 2 288 353 44.6 979 920 9.43 8.27 4.54 211 123852
1604393975550 21.19 2 289 354 44.6 1173 1011 8.44 7.42 3.33 194 123852
1604394043711 18.59 4 290 355 44.6 1139 1096 3.85 6.58 4.72 212 123853
1604394111834 15.59 5 292 356 44.6 1116 1144 0.31 10.49 3.31 129 123855
1604394177052 13.30 6 293 357 44.6 1046 1123 -3.30 0.00 1.51 48 123856
1604394233069 12.25 7 294 358 44.6 1162 1091 -5.12 6.94 2.84 113 123857
1604394281768 11.10 8 295 359 44.6 1200 1104 -6.35 4.94 3.18 126 123858
1604394360095 9.36 9 296 360 44.6 1059 1108 -7.40 2.79 1.57 46 123859
1604394425073 8.55 10 297 361 44.6 1010 1074 -7.88 7.32 1.87 55 123860
1604394445786 8.35 10 297 362 44.6 1192 1049 -7.92 9.61 1.84 69 123860
1604394520347 7.22 12 298 363 44.6 1089 1102 -8.31 4.83 3.19 108 123861
1604394592121 6.56 13 299 364 44.6 1195 1031 -8.26 9.06 2.63 51 123863
1604394663182 5.83 14 300 365 44.6 1167 1059 -8.51 9.07 2.44 53 123864
1604394727260 5.22 0 0 0 44.6 777 1024 -8.62 0.00 0.00 23 123865
1604394742227 5.21 0 0 1 44.6 668 966 -8.61 0.00 0.00 48 123865
1604394772082 5.24 0 1 1 44.6 691 834 -8.57 0.00 0.00 37 123865
1604394825507 5.28 0 1 2 44.6 616 723 -8.46 0.00 0.00 69 123866
1604394866590 5.30 0 2 3 44.6 567 664 -8.37 0.00 0.00 61 123866
1604394912354 5.34 0 3 3 44.6 654 612 -8.26 0.00 0.00 29 123867
1604394940063 5.36 0 3 4 44.6 621 612 -8.18 0.00 0.00 16 123868
1604394977176 5.39 0 4 4 44.6 638 606 -8.09 0.00 0.00 41 123868
1604395050481 5.43 0 4 6 44.6 622 631 -7.92 0.00 0.00 16 123869
1604395291139 5.60 0 7 10 44.6 571 568 -7.49 0.00 0.00 11 123871
 

gmfain

Well-known member
Joined
Jun 12, 2006
Location
Calhoun, GA
TDI
2015 Jetta TDI S
I found a post ...... the poster said it ended up being a fuel injector........ So I guess I will wait until the injector starts throwing a code, before the stealer will fix it under warranty.
 

gmfain

Well-known member
Joined
Jun 12, 2006
Location
Calhoun, GA
TDI
2015 Jetta TDI S
This is on the VW parts site:


Part Number: 04L130277AC
Supersession(s): 04L-130-277-AC; 04L130277; 4L130277AC
FUEL PRESSURE REGULATOR. INJECTOR. INJECTUNIT.
Incl.Lower O-Ring and Seal.
Fits Jetta (2015 - 2015)

A3; 2.0L TDI. Golf Sportwagen; 2.0L TDI. Golf; 2.0L TDI. Passat; 2.0L TDI.

Fuel Injector - Repair or Replace
A failed fuel injector will result in a misfire or bucking or hesitating under load in addition to a check engine light. If your Volkswagen Jetta has similar symptoms, contact the Volkswagen service department.
 
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