Good evening,

I'm having a major headache troubleshooting a 01314 fault code no communication with ECU.

Have tested all fuses (not contacts), tested the main 100 relay in the engine bay as well as some of the relays under the steering wheel.

The car was driving fine the night before it happened then went to start the next morning and dash lights come on with a few errors not seen previously, most of them related to 01314 code.

I've had the battery tray out to inspect the wiring and there's one suspect plug connector junction which was very damp although had it open today and seemed dry inside the connector. The exposed coloured wires might need a closer look, I've attached a photo, possibly a coroded wire there but it was hard to tell with all the oil residue and muck so will give it a good clean up tomorrow.

The other suspect thing is the drivers footwell is sodden with water coming down the inner pillar onto the floor. I'd sealed this before but the seal looks like it's disintegrated. Possibly related to that one of the relays in the area where the water ingress may have impacted is all taped up and looks like someone's previously done a diy wiring job on it all wrapped in electrical tape (photo attached) and not fixed to the relay panel where it should be, so I can't tell exactly what the relay controls and whether that might be a culprit for the 01314 code.

The car is a 2013 1.6 greenline mk2 octavia CAYC

I've scoured the forums for days now and had a lot of help along the way thanks to all the previous troubleshooting but now running out of ideas.

Any help much appreciated!

Oh and forgot to mention, in the 3rd photo of the taped up relay there's what appears to be a loose black wire top middle of the image with some white tape wrapped around it. Possibly has always been like that or at least since the diy wiring job but I don't know for sure and until I know what that relay is for it's hard to say whether it would be the cause of the 01314 code.

Does the wire with the white tape look as though its been cut?

Alasdair

Hi Alasdair, yes it looks like it from the photo but I'm guessing would have been cut a while ago as we haven't had any work done on this area of the car previously.

I found the schematic (attached) for this upper relay area above the central control unit which is the LHD version (ours is RHD) so image needs to be flipped.

You can see from the photo in the 1st post we appear to only have 3 relays in that module (507, 646 and the unidentified taped up one). According to the schematic the taped up one must be D5.2 relay for heating element, 507 must be starter relay and 646 the horn. None of the other relays in the schematic apply as they're for things this car doesn't have.

So even if the taped up D5.2 relay were faulty/wet or badly wired I'm assuming it's unlikely it would be the cause of the 01314 code... so time to look elsewhere I'm guessing unless you think the cut wire could be related.

• D1 – Relay for independent heater -J485- (for vehicles with an independent auxiliary heater) / relay for low heat output -J359- (for vehicles with auxiliary resistive heater (PTC))

• D2.1 Horn relay -J4-

• D2.2 – Fuel pump relay (for engine letters BUD, CGGA, BSE, BSF, CMXA, CHGA) / – Additional fuel pump  relay -J832- (for engine letters CLCA, CLCB, CFHF, CFHC, CEGA)

• D3 – Relay for high heat output -J360- (on  vehicles with additional resistance heater (PTC))
  D3.1 – Relay for fresh air blower -J13- (on vehicles with independent auxiliary heater)

• D3.2 – Additional heater fuel pump relay -J749- (on vehicles with an independent additional heater)

• D4 – Starter relay 2 -J907-

• D5.1 – headlight washer relay -J39

• D5.2 –  Relay for heating element -J925- (at engine lettering CAYC)

Here are also the list of fault codes for reference:

ABS:

01314 - Engine Control Module (ECM)

Power steering:

03803 - Steering Angle Sensor for Steering Aid: No or Incorrect Basic Setting / Adaptation

01314 - Engine Control Module (ECM)

Instrument cluster:

12648448

Central electronics:

01314 - Engine Control Module (ECM)

02395 - Parking light right front (M3)

Heater & air conditioning:

13701376

Radio:

00871 - Bass Speaker Front Right (R23)

Telephone:

9458451

CAN network gateway:

01314 - Engine Control Module (ECM)

No idea if wire is related. I asked if its been cut and not broken in case its come off something but if it looks cut I doubt its come off anything. With the drivers footwell soaking wondering if its corosion/water in the BCM/connection. Think its in that area. Another point would be whats the condition of battery. Low volts can often cause problems.

Thanks for the insight mate, I wondered about the BCM/canbus connection especially with the water ingress, that was going to be my next port of call it's quite low right at the back so a bit of a b*gger to get to but would definitely be worth checking if I can.

I tried a new battery as the first potential remedy but didn't solve it unfortunately. :(

Think the BCM and ECU are closely linked and can cause no start if its not connected properly.

Alasdair

Ok great thanks again, will try and explore that further then and will report back 🤞👍

UPDATE:

I gave up trying to get the canbus module out from the interior as it was so far back behind all the relays and wiring, so followed this very good guide on how to remove it from the outside: https://www.r32oc.com/threads/canbus-gateway-location-removal.29242/

The good news is the canbus itself and connector both look bone dry and I think I can rule that out, the bad news is I've still not found the root of the issue. I would quite like to inspect the canbus module PCB though, does any one know how to release the 4 clips without damaging the plastic housing?

Tomorrow I need to check the connector points for the lower mounted internal relays and inspect for damp/corrosion etc there. One of the relays there did have what looked like a drip of water on the surface so we'll see. But my thoughts now are back to being that the fault is most likely rooted in the wiring loom to the ECU under the battery tray or somewhere around that area.

UPDATE:

Had a mechanic out to look and after turning the key first time the car started I couldn't believe it(!) magic touch! But it kept cutting out and was running rough with 01314 code persisting. I had had the canbus out a few days in the dry and had only just put it back so suggested it might be that, although he dismissed the canbus logic.

He did point out that the starter cable points on both ends in the engine bay looked quite corroded and might be the cause of the no start.

A few more days passed and a lot more rain, went to start it to drive to garage and no crank again, back to square one!

Today I cleaned and grinded the corroded points connected to the starter but still no dice, same issues.

The pillar and floor on the driver side is sopping wet (I haven't been able to seal the roof rail fixing area due to all the rain). It must be related to water ingress to the electrics in the cabin... possibly canbus.

If I fitted a temporary replacment canbus would I be able to tell if that has solved it without having to recode it ?

Still having the same issues, have explored some other avenues without luck yet, the problem is we're quite remote and local garages won't look at electrical faults so we're a bit stuck. Had a VCDS scan done using a mates scanning tool, there are a few suspect fault codes stemming around the drivers area which is where the water ingress occured originally (now sealed so it's drying out).

if anyone has experience interpreting VCDS and could point me in the right direction would be much appreciated! Cheers!

Gateway Installation List:  7N0 907 530 AG

01-Engine -- Status: Cannot be reached 1100

03-ABS Brakes -- Status: Malfunction 0010

04-Steering Angle -- Status: OK 0000

08-Auto HVAC -- Status: Malfunction 0010

09-Cent. Elect. -- Status: Malfunction 0010

15-Airbags -- Status: OK 0000

16-Steering wheel -- Status: OK 0000

17-Instruments -- Status: Malfunction 0010

19-CAN Gateway -- Status: Malfunction 0010

25-Immobilizer -- Status: OK 0000

42-Door Elect, Driver -- Status: Malfunction 0010

44-Steering Assist -- Status: Malfunction 0010

46-Central Conv. -- Status: OK 0000

52-Door Elect, Pass. -- Status: OK 0000

56-Radio -- Status: Malfunction 0010

61-Battery Regul. -- Status: OK 0000

77-Telephone -- Status: Malfunction 0010

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

Chassis Type: 1Z-SK35 (7N0)

Scan: 01 03 08 09 15 16 17 19 25 42 44 46 52 56 61 77

<VIN Removed>   Mileage: 333340km-207127miles

01-Engine -- Status: Cannot be reached 1100

03-ABS Brakes -- Status: Malfunction 0010

04-Steering Angle -- Status: OK 0000

08-Auto HVAC -- Status: Malfunction 0010

09-Cent. Elect. -- Status: Malfunction 0010

15-Airbags -- Status: OK 0000

16-Steering wheel -- Status: OK 0000

17-Instruments -- Status: Malfunction 0010

19-CAN Gateway -- Status: Malfunction 0010

25-Immobilizer -- Status: OK 0000

42-Door Elect, Driver -- Status: Malfunction 0010

44-Steering Assist -- Status: Malfunction 0010

46-Central Conv. -- Status: OK 0000

52-Door Elect, Pass. -- Status: OK 0000

56-Radio -- Status: Malfunction 0010

61-Battery Regul. -- Status: OK 0000

77-Telephone -- Status: Malfunction 0010

 

-------------------------------------------------------------------------------

Address 01: Engine

Cannot be reached

-------------------------------------------------------------------------------

Address 03: ABS Brakes (J104)       Labels:. 1K0-907-379-60EC1F.clb

   Part No SW: 1K0 907 379 BL    HW: 1K0 907 379 BL

   Component: ESP MK60EC1   H31 0152  

   Revision: 00H31001    

   Coding: 133B201C092200FCC80D04EA901B0091300000

   Shop #: WSC 73430 790 00064

   VCID: 7DF14CF3E4F16773AB-8028

1 Fault Found:

01314 - Engine Control Module 

            004 - No Signal/Communication

             Freeze Frame:

                    Fault Status: 01100100

                    Fault Priority: 2

                    Fault Frequency: 1

                    Reset counter: 204

                    Mileage: 333347 km

                    Time Indication: 0

                    Date: 2020.02.24.

                    Time: 01:28:24

             Freeze Frame:

                    Count: 3

                    Count: 2

                    Count: 4608

                    Count: 8194

                    Count: 42752

                    Count: 0

                    Count: 0

                    Count: 0

-------------------------------------------------------------------------------

Address 08: Auto HVAC (J301)       Labels:| 3C8-907-336.clb

   Part No SW: 3T0 820 047 AF    HW: 3T0 820 047 AF

   Component: AC Manuell    H20 0607  

   Revision: 00001012    

   Coding: 0010000003

   Shop #: WSC 73430 790 00064

   ASAM Dataset: EV_ACManueBHBVW36X A01010

   ROD: EV_ACManueBHBVW36X_SK35.rod

   VCID: 73E56ACBDAB52103CD-8026

1 Fault Found:

13701376 - Function Restricted due to Missing Message(s) 

          U1111 00 [00001001] - -

          [New feature! Extended UDS fault detail is only supported by current gen. interfaces]

          Confirmed - Tested Since Memory Clear

             Freeze Frame:

                    Fault Priority: 6

                    Fault Frequency: 5

                    Reset counter: 204

                    Mileage: 333347 km

                    Date: 2025.10.03.

                    Time: 01:28:28

-------------------------------------------------------------------------------

Address 09: Cent. Elect. (J519)       Labels:. 1K0-937-08x-09.clb

   Part No SW: 1K0 937 085 P    HW: 1K0 937 085 P

   Component: BCM PQ35  B+  111 0709  

   Revision: AC111709    

   Coding: 48000AB8A05BB1904008008011000024430000AE424D81605CC5C7000041

   Shop #: WSC 73430 790 00064

   VCID: 3C7781F7BF6BAE7BDC-8068

   Subsystem 2 - Part No: 1Z0 951 171 

   Component: Innenraumuebe  008 5101 

   Subsystem 3 - Part No: 1K0 951 605 C

   Component: LIN BACKUP HO  H05 1501 

4 Faults Found:

01314 - Engine Control Module 

            004 - No Signal/Communication

             Freeze Frame:

                    Fault Status: 01100100

                    Fault Priority: 6

                    Fault Frequency: 1

                    Reset counter: 204

                    Mileage: 333347 km

                    Time Indication: 0

                    Date: 2020.02.24.

                    Time: 01:28:27

             Freeze Frame:

                        Term 15 On

                    Voltage: 11.90 V

                        ON

                        ON

                        Term 50 On

                        OFF

                        OFF

00153 - Windshield Wiper Motor;  Driver Side (V216) 

            004 - No Signal/Communication

             Freeze Frame:

                    Fault Status: 01100100

                    Fault Priority: 2

                    Fault Frequency: 1

                    Reset counter: 204

                    Mileage: 333347 km

                    Time Indication: 0

                    Date: 2020.02.24.

                    Time: 01:28:27

             Freeze Frame:

                        Term 15 On

                    Voltage: 11.90 V

                        ON

                        ON

                        Term 50 On

                        OFF

                        OFF

02395 - Parking Light Front Right (M3) 

            010 - Open or Short to Plus

             Freeze Frame:

                    Fault Status: 01101010

                    Fault Priority: 2

                    Fault Frequency: 8

                    Reset counter: 204

                    Mileage: 333347 km

                    Time Indication: 0

                    Date: 2020.02.24.

                    Time: 01:28:46

             Freeze Frame:

                        Term 15 On

                    Voltage: 11.90 V

                        ON

                        ON

                        Term 50 On

                        OFF

                        OFF

00834 - Signal for Activation of Heated Rear Window 

            009 - Open or Short to Ground - Intermittent

             Freeze Frame:

                    Fault Status: 00101001

                    Fault Priority: 5

                    Fault Frequency: 1

                    Reset counter: 244

                    Mileage: 333347 km

                    Time Indication: 0

                    Date: 2020.02.24.

                    Time: 03:55:16

             Freeze Frame:

                        Term 15 Off

                    Voltage: 12.25 V

                        OFF

                        ON

                        Term 50 Off

                        OFF

                        OFF

-------------------------------------------------------------------------------

Address 15: Airbags        Labels: 1K0-909-605.lbl

   Part No SW: 1K0 909 605 T    HW: 1K0 909 605 T

   Component: Q4 AIRBAG VW8   020 2300  

   Revision: 05020000    Serial number: 0038PD2YGMTN  

   Coding: 0020788

   Shop #: WSC 73430 790 00064

   VCID: 3D718CF36471A773EB-8068

   Subsystem 1 - Serial number: 6332MSME720059071

   Subsystem 2 - Serial number: 6342MSME72002F0EC

No fault code found.

-------------------------------------------------------------------------------

Address 16: Steering wheel (J527)       Labels:| 5K0-953-569.clb

   Part No SW: 5K0 953 521 BN    HW: 5K0 953 569 E

   Component: LENKS.MODUL   014 0140  

   Revision: FF010041    Serial number: 20121123800232

   Coding: 108A140000

   Shop #: WSC 73430 790 00064

   ASAM Dataset: EV_SMLSNGVOLWSXS A01004

   ROD: EV_SMLSNGVOLWS_SK35.rod

   VCID: 79F958E3F8D95B5387-802C

   Multifunction steering wheel control module: 

   Subsystem 1 - Part No SW: 3T0 959 537     HW: 3T0 959 537   Labels: 3C8-959-537.CLB

   Component: E221__MFL-URO  H07 0012 

   Coding: 820000

No fault code found.

-------------------------------------------------------------------------------

Address 17: Instruments (J285)       Labels:| 5K0-920-xxx-17.clb-SRI1

   Part No SW: 1Z0 920 943 S    HW: 1Z0 920 943 S

   Component: KOMBI         H06 0608  

   Serial number: 00000000000000

   Coding: 410800

   Shop #: WSC 73430 031 00064

   ASAM Dataset: EV_Kombi_UDS_VDD_RM09 A04114

   ROD: EV_Kombi_UDS_VDD_RM09_004_SK35.rod

   VCID: 4999E823E8B90BD357-801C

1 Fault Found:

12648448 - Function Restricted due to Missing Message(s) 

          U1111 00 [00001001] - -

          [New feature! Extended UDS fault detail is only supported by current gen. interfaces]

          Confirmed - Tested Since Memory Clear

             Freeze Frame:

                    Fault Priority: 6

                    Fault Frequency: 1

                    Reset counter: 204

                    Mileage: 333347 km

                    Date: 2025.10.03.

                    Time: 01:28:30

-------------------------------------------------------------------------------

Address 19: CAN Gateway (J533)       Labels:. 7N0-907-530-V2.clb

   Part No SW: 7N0 907 530 AG    HW: 7N0 907 530 AG

   Component: J533  Gateway H53 1634  

   Revision:   H53       Serial number: 131112F1000966

   Coding: 352303

   Shop #: WSC 73430 790 00064

   VCID: 75E154D3DCC13F33E3-8020

2 Faults Found:

01314 - Engine Control Module 

            004 - No Signal/Communication

             Freeze Frame:

                    Fault Status: 01100100

                    Fault Priority: 2

                    Fault Frequency: 1

                    Reset counter: 204

                    Mileage: 333347 km

                    Time Indication: 0

                    Date: 2020.02.24.

                    Time: 01:28:27

00470 - Company Comfort Databus in Single Wire 

            011 - Open Circuit - Intermittent

             Freeze Frame:

                    Fault Status: 00101011

                    Fault Priority: 3

                    Fault Frequency: 1

                    Reset counter: 244

                    Mileage: 333347 km

                    Time Indication: 0

                    Date: 2020.02.24.

                    Time: 01:58:50

-------------------------------------------------------------------------------

Address 25: Immobilizer (J334)       Labels:| 5K0-920-xxx-25.clb

   Part No SW: 5K0 953 234     HW: 5K0 953 234 

   Component: IMMO          H06 0608  

   Serial number: 00000000000000

   Coding: 000000

   Shop #: WSC 00000 000 00000

   ASAM Dataset: EV_Immo_UDS_VDD_RM09 A03009

   ROD: EV_Immo_UDS_VDD_RM09_SK35.rod

   VCID: 6ADB77AF8D7FE0CB7E-803E

No fault code found.

-------------------------------------------------------------------------------

Address 42: Door Elect, Driver        Labels:. 1K0-959-701-MIN3.clb

   Part No SW: 1T0 959 701 T    HW: 1T0 959 701 T

   Component: Tuer-SG         009 2120  

   Coding: 0131700

   Shop #: WSC 73430 790 00064

   VCID: 489FED273BB3F2DB48-801C

1 Fault Found:

01706 - Switch for Mirror-Adjust (E43) 

            008 - Implausible Signal

-------------------------------------------------------------------------------

Address 44: Steering Assist        Labels: 1K0-909-14x-GEN3.clb

   Part No: 1K0 909 144 P

   Component: EPS_ZFLS Kl. 69     3305  

   Revision: 00H22000    

   Shop #: WSC 73430 790 00064

   VCID: 377D9EDB464D8D2331-8062

2 Faults Found:

03803 - Steering Angle Sensor for Steering Aid 

            000 - - - MIL ON

             Freeze Frame:

                    Fault Status: 11100000

                    Fault Priority: 2

                    Fault Frequency: 1

                    Reset counter: 255

                    Mileage: 333347 km

                    Time Indication: 0

                    Date: 2020.02.24.

                    Time: 01:28:31

             Freeze Frame:

                    Battery Volts: 12.0 V

                        DU

                    Temperature: 12.0°C

                    Count: 2

                    Steering Angle: 0.00°

                    Count: 0

                        SteerAng n.Init

01314 - Engine Control Module 

            004 - No Signal/Communication

             Freeze Frame:

                    Fault Status: 01100100

                    Fault Priority: 3

                    Fault Frequency: 1

                    Reset counter: 204

                    Mileage: 333347 km

                    Time Indication: 0

                    Date: 2020.02.24.

                    Time: 01:28:31

             Freeze Frame:

                    Voltage: 12.00 V

                        DU

                    Temperature: 12.0°C

                    RPM: 1498 /min

                    Speed: 0.0 km/h

                    Speed: 0.0 km/h

                    Count: 0

-------------------------------------------------------------------------------

Address 52: Door Elect, Pass.        Labels:. 1K0-959-702-MIN3.clb

   Part No SW: 1T0 959 702 R    HW: 1T0 959 702 R

   Component: Tuer-SG         009 2120  

   Coding: 0131700

   Shop #: WSC 73430 790 00064

   VCID: 479DEE1B36ADFDA341-8012

No fault code found.

-------------------------------------------------------------------------------

Address 56: Radio (J503)       Labels:. 5M0-035-1xx-56.clb

   Part No SW: 1Z0 035 156 M    HW: 1Z0 035 156 M

   Component: BOLERO        001 0008  

   Revision: -----08S    Serial number: SKZ4Z3M1182945

   Coding: 000002000001

   Shop #: WSC 73430 790 00064

   VCID: 3C7781F7BF6BAE7BDC-8068

1 Fault Found:

00871 - Bass Speaker Front Right (R23) 

            011 - Open Circuit - Intermittent

             Freeze Frame:

                    Fault Status: 00101011

                    Fault Priority: 5

                    Fault Frequency: 1

                    Reset counter: 204

                    Mileage: 333347 km

                    Time Indication: 0

                    Date: 2020.02.24.

                    Time: 01:28:31

-------------------------------------------------------------------------------

Address 61: Battery Regul. (J840)       Labels:. 1K0-907-534.clb

   Part No SW: 7N0 907 534     HW: 7N0 907 530 AG

   Component: Batt.regelung H53 1634  

   Serial number: 131112F1000966

   Coding: 030F185A

   Shop #: WSC 73430 790 00064

   VCID: 71E960C3A8A913133F-8024

   Subsystem 1 - Part No SW: 1K0 915 181 H    HW: 1K0 915 181 A

   Component: J367-BDM  H07 0180 

   Serial number: 00000000008900529126

No fault code found.

-------------------------------------------------------------------------------

Address 77: Telephone (J412)       Labels:| 3C8-035-730-A.clb

   Part No SW: 3C8 035 730 C    HW: 3C8 035 730 C

   Component: Telefon       012 0822  

   Revision: --------    Serial number: 35909603489858

   Coding: 020000000100010000000000

   Shop #: WSC 73430 031 00064

   ASAM Dataset: EV_UHVPremi A02705

   ROD: EV_UHVPremi_A02_SK35.rod

   VCID: 23455A8B2AD5F183FD-8076

1 Fault Found:

9458451 - Cellular Antenna 

          B1053 13 [00001001] - Open Circuit

          [New feature! Extended UDS fault detail is only supported by current gen. interfaces]

          Confirmed - Tested Since Memory Clear

             Freeze Frame:

                    Fault Priority: 4

                    Fault Frequency: 1

                    Reset counter: 204

                    Mileage: 333347 km

                    Date: 2025.10.03.

                    Time: 01:28:23

End-------------------------(Elapsed Time: 02:57)--------------------------

------------------------------14 Faults Found------------------------------

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