The Dreaded 01314 Fault Code | Volkswagen Touareg Forum

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Lovejoy L I have a 2004 2.5 TDI Touareg auto with 124,800 miles on the clock. A short while ago the PNDRS panel on the dash stayed lit instead of indicating the operating gear. The car drove perfectly normally so I ignored it as a service was soon due and garage could sort it out then. However, after it had been in very hot sun I tried to start it but the ESP light stayed on also and it made no attempt to start. I was 150 miles from home so called for breakdown assistance. Mechanic plugged in his kit and said it was a TCM issue. No power being allowed to the starter. Several hours later a breakdown truck arrived. He was about to winch it onto his lorry in PARK so I stopped him and turned on the ignition in order to get it into Neutral. Must have been a bit heavy on the ignition switch as the car suddenly burst into life. The ESP lit had gone off allowing it to start. Drove home with no problem. Parked up, switched off. Then tried another start. Nothing - the ESP combination of warning lights were back. Next day. Car started with PNDRS only lit up. Drove to my normal (non-VAG) garage. They spent several hours trying to find the fault but said I would need to go to the main agents. They found faults relating to intermittent communication between ECU and ABS. They said that when they cleared the faults the car would start and drive perfectly but the faults simply reappeared. As the car is 2004 it is not cost-effective to go to my main VW agents. Made this mistake before. So thought I would ask if anyone else had come across this problem. I know that the Forum techies will want proper fault codes so today I had a mobile diagnostic chap with a Ross-Tech VCDS come to me to check out the fault codes. So here goes: Address 03: ABS Brakes Labels: 7L0-907-379-MK25.lbl 1 Fault found: 01314 - Engine Control Module 004 - No Signal\Communication Address 05: Acc\Start Auth. Labels: 3D0-909-13x-05.lbl 3 Faults Found: 01049 - Supply Voltage Term 50 009 - Open or Short to Ground - Intermittent 01314 - Engine Control Module 004 - No Signal\Communication 01299 - Diagnostic Interface for Data Bus (J533) 013 - Check DTC Memory Well Guys is this enough for you to point me (or auto electrician really) in the right direction. At the moment I am contemplating selling the car as spares or repair because I cannot afford to put it through the main agents to learn on. As the Engineer who came today said - it would be a shame because it is a really nice car and it is probably just a poor connection somewhere. Advice please Thanks in anticipation. #1 · Jun 11, 2017 I have a 2004 2.5 TDI Touareg auto with 124,800 miles on the clock. A short while ago the PNDRS panel on the dash stayed lit instead of indicating the operating gear. The car drove perfectly normally so I ignored it as a service was soon due and garage could sort it out then. However, after it had been in very hot sun I tried to start it but the ESP light stayed on also and it made no attempt to start. I was 150 miles from home so called for breakdown assistance. Mechanic plugged in his kit and said it was a TCM issue. No power being allowed to the starter. Several hours later a breakdown truck arrived. He was about to winch it onto his lorry in PARK so I stopped him and turned on the ignition in order to get it into Neutral. Must have been a bit heavy on the ignition switch as the car suddenly burst into life. The ESP lit had gone off allowing it to start. Drove home with no problem. Parked up, switched off. Then tried another start. Nothing - the ESP combination of warning lights were back. Next day. Car started with PNDRS only lit up. Drove to my normal (non-VAG) garage. They spent several hours trying to find the fault but said I would need to go to the main agents. They found faults relating to intermittent communication between ECU and ABS. They said that when they cleared the faults the car would start and drive perfectly but the faults simply reappeared. As the car is 2004 it is not cost-effective to go to my main VW agents. Made this mistake before. So thought I would ask if anyone else had come across this problem. I know that the Forum techies will want proper fault codes so today I had a mobile diagnostic chap with a Ross-Tech VCDS come to me to check out the fault codes. So here goes: Address 03: ABS Brakes Labels: 7L0-907-379-MK25.lbl 1 Fault found: 01314 - Engine Control Module 004 - No Signal\Communication Address 05: Acc\Start Auth. Labels: 3D0-909-13x-05.lbl 3 Faults Found: 01049 - Supply Voltage Term 50 009 - Open or Short to Ground - Intermittent 01314 - Engine Control Module 004 - No Signal\Communication 01299 - Diagnostic Interface for Data Bus (J533) 013 - Check DTC Memory Well Guys is this enough for you to point me (or auto electrician really) in the right direction. At the moment I am contemplating selling the car as spares or repair because I cannot afford to put it through the main agents to learn on. As the Engineer who came today said - it would be a shame because it is a really nice car and it is probably just a poor connection somewhere. Advice please Thanks in anticipation. See less See more Sort by Oldest first Oldest first Newest first Most reactions #2 · Jun 11, 2017 (Edited by Moderator) To begin with I would lift the front passenger carpet and check for evidence of dampness. Check electrical harness near the base of the A pillar, peel back insulation and examine all wiring splices for corrosion. #3 · Jun 12, 2017 Thank you Chaser for your early response. I popped out last night to do as you say, only to find that lifting the carpet is not a straight-forward job. Presumably the insert part of the trim over the sill hides some hex screws. I will need to investigate this further during the week when the weather is fine. The beast is outside on my drive. I am expecting it to be dry as I have had no hint of dampness or condensation in the cabin, but we will see.... Again thanks Show more replies 1 Reply #4 · Jun 12, 2017 http://www.clubtouareg.com/forums/f43/stuck-in-park-brake-fault-61788.html See the photos. Don't forget that in the US contributor's car, the wiring, which is on the passenger side in your car, is on the driver's side in their's! #5 · Jun 12, 2017 Thanks Nooby. Very useful referral. Know what I am looking for now. Rather shocked at the crappy connections used in a top of the line VW. 1 Reply #7 · Jun 12, 2017 Eh? Not sure you read my post aright: the wiring and the battery are on the same side of the car regardless of where the steering wheel is, i.e., both on the right when looking at the car from the front. #8 · Jun 12, 2017 I must have had my glasses on back to front, yes that makes sense. J 0 Reply #11 · Jun 14, 2017 (Edited by Moderator) Thoughts..... you need an electrician armed with circuit diagrams... the starter is on the right side.... you could be hearing a relay clicking, there are some under the passenger seat and also in an electronics box in the left plenum. the various errors will almost certainly linked to one fault, possibly resulting in a control unit losing power so cannot communicate with other control units...therefore multiple errors. hence mentioning the fairly common issue of harness corrosion. once you have the seat tilted back check everything from battery connections, earth points, to engine compartment starting aid connection, to alternator and on to engine control unit and its connections fitted in right plenum also abs controller below it. #12 · Jun 14, 2017 Thanks Chaser I have today had managed to tilt the seat and lift the front passenger carpet. All good under there. Amazed to see everything clean and shiny like new. Earth good and no damp or rust. Opened up part of the loom and again no damp or evidence of such in the past. All like new. So have re-taped loom and put all back. My log for today's starting potential (ambient temp. in brackets) is as follows: 07.30 (Cool) - Only PNDRS panel lit. Car would start if requested. 10.00 (Warm)- Only PNDRS panel lit. Car would start if requested. 12.00 (Quite Hot)- ESP + PNDRS panel lit. No chance of start. 14.30 (Hot)- ESP + PNDRS panel lit. No chance of start. 16.30 (Quite Hot)- ESP + PNDRS panel lit. No chance of start. 18.00 (Warm)- ESP + PNDRS panel lit. No chance of start. 22.00 (Cool) - Only PNDRS panel lit. Car would start if requested. I think that the ambient temp prior to starting is relevant and more than co-incidental. I downloaded the VW Self-study Programme 298 'The Touareg Electrical System'. On Page 17 it indicates that there is a C20 'Terminal 50 Power Supply' Relay in the Plenum Chamber box. I was interested in this relay as one of the faults recorded by Ross-Tech was 01049 'Supply Voltage Terminal 50'. However when I opened up my plenum box there was no C20 Relay. Unfortunately it appears that Fuses and Relay positions vary according to model and engine type. The tutorial refers the reader to ELSA (electronic service information system). So stumped again 0 Reply #13 · Jun 14, 2017 If your spanner skills are good, then do look at ELSA. You can buy time on there by the hour or day, and download what you need. #14 · Jun 15, 2017 Thanks NoobyT Didn't realise I could buy time with ELSA (so to speak!). Will investigate. 0 Reply #15 · Jun 15, 2017 LOL, spanner skills are of no help when it comes to modern vehicle electronics. A 20 something with computer skills probably has a better chance of understanding and tracing this stuff. VCDS scans can help but often only if you can use the time stamps and other recorded information to fathom "chicken and egg" situations. Consequential errors can send you looking in the wrong place. There are almost always red herrings in scan reports. In my experience you also have to clear codes regularly during fault finding because every time you remove a connection, fuse or component to inspect it, that flags further codes. As for the temperature influence, sometimes a faulty starter motor will refuse to operate when it's hot. I don't think it would throw these codes you have reported though. Resistance would increase with temperature in any poor electrical connection in a circuit would it not so logging temps isn't necessarily telling you anything new. You might be better passing this up and employing the services of a VAG experienced auto electrician. Without diagnostics equipment at hand to aid you and experience at deciphering the current flow diagrams the odds are against most diy'ers. #16 · Jun 20, 2017 Finally frustration got the better of me. Put it up on Ebay as Spares or Repair. Lot of interest - 20 Offers in 24 hours. Sold with 48 hours to a large used spares company in Braintree. My Touareg may live on by supplying Treg Owners with transplanted parts. So I guess this is my Goodbye. Thanks for all your help over the last few years. Regards Lovejoy Show more replies 0 Reply #18 · Jan 1, 2022 Just replying here in case it helps anyone else. I have an almost identical issue (ESP light, PRNDS flashing, loss of power, intermittently not starting) on a 2007 Skoda Octavia mk2 1.9 TDI DSG. The ESP does seem to be the key reason for not starting/engine cutting out while driving, as it has started with PRNDS flashing. The garage has changed the relay however this hasn’t fixed the issue. The error code 01314 (loss of signal to the electrical control box - ECU) has come up on the the garage diagnostics (non VAG) under the heading ‘Brake Electronics’. After lots of searching online I’m thinking this is related to the ABS wheel speed sensors rather than the ECU itself however I am by no means an expert. I am heading back to the garage when it reopens to see if these can be replaced. I’ll keep you all posted on progress! #19 · Jan 2, 2022 I had a similar issue on my Treg and the final result was water in the heater controls, which was causing all kinds of silly backfeed problems in the electrical system, I had esp, and general electrical faults turning up in all systems Problem is that each of the various electrical systems 'talk' to each other through the canbus and if there is a fault or failure, it is like a domino effect Insert Quotes Post Reply

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