2015 passat tdi error code p2456

[forrest resto`s]

Hey guys.( mistakenly post previously in wrong forum, sorry)I sure need some help please?. I did a total maintenance repair ( acc. drive belt, timing belt, water pump, all roller pulley's, front crank plate oil seal, cam seal, upper lower oil pans! Don't want to do this again! everything,).. anyway.. all seemed well!.. After driving about 20 miles the p2456 code came up ( check engine light on).. ran the scan ( VCDS scan, )..and showed the code.. Soo I cleared it and cleaned all the connectors checked hose connectors ect... Started it up again, let it idle for around 20 minutes, then drove it about 20 miles, no check engine light) and then parked it.. started it back up again, let it idle again for 20 minutes and drove it another 10 miles.. No problem.. rinse and repeat.. Turned it off, after about 30 minutes, started it back up, let idle for 20 minutes drove again for around 15miles and check engine light back on same code.. This car had NO problems/no codes prior to my work.. any thoughts? Thanx!
vcds info below I really appreciate any help! Sorry about the long info scan..


Thursday,08,May,2025,18:30:25:13226
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 24.5.0.0 (x64)
Data version: 20240429 DS355.0
www.Ross-Tech.com


VIN: 1VWBV7A34FC012877 License Plate:


Chassis Type: A3-VW41 (7N0)
Scan: 01 02 03 08 09 15 16 17 19 1C 25 2E 42 44 46 4F 52 56 62 72
75 77

VIN: 1VWBV7A34FC012877 Mileage: 232960km-144754miles

01-Engine -- Status: Malfunction 0010
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: Malfunction 0010
04-Steering Angle -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: Malfunction 0010
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
1C-Position Sensing -- Status: OK 0000
25-Immobilizer -- Status: OK 0000
2E-Media Player 3 -- Status: OK 0000
42-Door Elect, Driver -- Status: Malfunction 0010
44-Steering Assist -- Status: OK 0000
46-Central Conv. -- Status: OK 0000
4F-Centr. Electr. II -- Status: OK 0000
52-Door Elect, Pass. -- Status: Malfunction 0010
56-Radio -- Status: OK 0000
62-Door, Rear Left -- Status: OK 0000
72-Door, Rear Right -- Status: OK 0000
75-Telematics -- Status: Malfunction 0010
77-Telephone -- Status: OK 0000

-------------------------------------------------------------------------------
Address 01: Engine (J623-CVCA) Labels:. 04L-907-309-V1.clb
Part No SW: 04L 997 016 D HW: 04L 907 309 K
Component: R4 2.0l TDI H20 9466
Revision: 8AH20--- CVN: C3699F2538D3FF82B866C2AD
Coding: 011D0012032410080000
Shop #: WSC 07239 444 00000
ASAM Dataset: EV_ECM20TDI01104L997016D 004002
ROD: EV_ECM20TDI01104L997016D.rod
VCID: 3449F5C89F08C53697-8060
VINID: 0669D29874431164C00422071C20871C5E

1 Fault Found:
5158 - Particulate Filter; Differential Pressure Sensor
P2456 00 [11101101] - Intermittent
MIL ON - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 2
Fault Frequency: 1
Mileage: 232949 km
Date: 2025.05.08
Time: 04:09:16

Engine RPM: 1274.00 /min
Normed load value: 0.0 %
Vehicle speed: 75 km/h
Coolant temperature: 70 °C
Intake air temperature: 87 °C
Ambient air pressure: 980 mbar
Voltage terminal 30: 13.620 V
Unlearning counter according OBD: 40
Particle filter: air pressure sensor 1 bank 1: raw value: 0 hPa
Particl.filt.: different.press.sensor 1 bank 1: adaptat. value: 0 hPa
Par.fil: diff.pr.sens.1 bank 1: offset: 3 hPa
Particl.filt.: differential pressur.sensor 1 bank 1: dyn.offset: 0 hPa
Outside temperature sensor 1: B1: raw value: 29.0 °C
Particle filter: soot mass measured: -12.20 g
Particle filter: soot mass calculated: 5.94 g

Readiness: 1 1 0 0 1

-------------------------------------------------------------------------------
Address 02: Auto Trans Labels: 02E-927-770.clb
Part No SW: 02E 300 061 T HW: 02E 927 770 AL
Component: GSG DSG AG6 521 4518
Revision: 05652104 Serial number: 00001405193213
Coding: 0000020
Shop #: WSC 09003 957 00200
VCID: 256F188CECD2ACBE10-8070

No fault code found.

 

[forrest resto`s]

..something is not connected correctly? Rechecking pressure sensors connectors wrapped in "blanket"...Found the dif. sensor closest to pass. side (vw 03l 906 051b) with a broken nipple so the hose is not connected, the plastic nipple is NOT inside the hose and the hose clamp is still on the end where the nipple should be? so I don't know what happened there? I assume that hose should go to where the missing nipple is, (there's 2 nipples on the other sensor, drivers side with one hose connected and one nipple open).. I assume this would cause that code correct?? lol! calling dealer for the part..

 

[AverageAndy]

Yes, that will cause your code. It is very common for the nipple on the sensor to crack/break while doing a timing belt. You are lucky you caught it before the hot exhaust gasses melted everything in the vicinity!

 

[Mozambiquer]

..something is not connected correctly? Rechecking pressure sensors connectors wrapped in "blanket"...Found the dif. sensor closest to pass. side (vw 03l 906 051b) with a broken nipple so the hose is not connected, the plastic nipple is NOT inside the hose and the hose clamp is still on the end where the nipple should be? so I don't know what happened there? I assume that hose should go to where the missing nipple is, (there's 2 nipples on the other sensor, drivers side with one hose connected and one nipple open).. I assume this would cause that code correct?? lol! calling dealer for the part..

That's very common. On those you've got to pull the differential pressure sensors and tubes off of the car when you do the timing belt, or it'll crack and then you'll get that code.

 

[forrest resto`s]

Yep!.. Live and learn! Well at least it was only one of the sensors LOL!.. They are expensive!.. $110.00 with my shop discount from VW dealer..Funny .. you can buy the sensor on Amazon for around $20.00!.. NO THANX! I always appreciate the help guys!.. Thanx