Hi all,

 

I have a 2018 MkIII Superb 2.0 tdi 4x4 DSG Estate with 55k miles. I need some help please. During normal driving and under moderate to heavy acceleration (not even at kick down stage on the throttle pedal), the car hiccups and goes into limp home mode with the gloplug light (coil) flashing in yellow on the dashboard. To resolve it, I have to stop, switch off completely and restart - the light goes off and the car returns to normal, until it happens again.

 

The local Skoda dealership have been supportive, already having diagnosed a fuel delivery issue and having changed the level senders and pumps in both sides of the saddle tank, and fuel filter. And they paid 90% given it is so recently out of warranty. However, it's still occurring. Does anyone have any ideas where I should look next? Some have suggested a split hose to the turbo, others have suggested a failing battery. I can replace the battery easily enough and get it programmed, however am I looking in the right place?

 

Thanks

Have they changed, or tested, the injectors?

What code is being stored after the failure occurs? 

unsure about testing the injectors - they haven't been replaced though.

 

 

Like J Caff said, you need to find what fault code is being logged but the fact Skoda went down to looking at fuelling issues I’d say the code will be something along those lines but very hard to say.

 

previous experience about limp mode was down to sticking turbo vanes on my old Passat 

Sounds very symptomatic of a EGR issue, I had this several times on my '12 plate Audi A3. But its impossible to diagnose without a fault code.

13 minutes ago, Danoid said:

Like J Caff said, you need to find what fault code is being logged but the fact Skoda went down to looking at fuelling issues I’d say the code will be something along those lines but very hard to say.

 

previous experience about limp mode was down to sticking turbo vanes on my old Passat 

Similar to yourself I had the dreaded overboost sticking vanes problem with my 07 Octavia, I also had drivability problems which were caused by a failed throttle pedal, so without the code it could be anything. 

Thanks all - I'll try to get a fault code and report back.

I had a similar issue on my old Audi a4 b7 turned out to be the brake pedal switch. Changed it, no more limp mode and coil light flashing.

Edited 15 November, 20214 yr by Simon TDI Sport
Spelling mistake

1 hour ago, Simon TDI Sport said:

I had a similar issue on my old Audi a4 b7 turned out to be the brake pedal switch. Changed it, no more limp mode and coil light flashing.

His is dsg, BLS failure with a dsg car will lock the gear lever in P. 

6 hours ago, j caff said:

Similar to yourself I had the dreaded overboost sticking vanes problem with my 07 Octavia, I also had drivability problems which were caused by a failed throttle pedal, so without the code it could be anything. 

Do you mind if I ask what issues the failed throttle pedal where causing ??

38 minutes ago, k.young said:

Do you mind if I ask what issues the failed throttle pedal where causing ??

Intermittent loss of power initially and then the car would become undriveable until the coil light started to flash. Throttle pedal signal implausible was the stored code. I replaced the pedal and it was perfect again, being a manual car it didn't need coding. 

Thanks all. I have checked the fault codes and it is a P0087 $7E8 generic code, described as fuel rail / system pressure too low.

 

It has already had its fuel pumps and level senders replaced along with fuel filter. 

Not conclusive it seems but someone had a dodgy alternator and changed that.

 

I guess you’ll be able to know if that’s the case as Halfords do/did free battery & alternator tests, worth a shot.

 

If not, take it back to Skoda and tell them to fix it

Thanks all. Will update you when I know more. 

These modern cars with their helpful diagnostics 😆

Indeed!!

2 hours ago, Shugmo said:

These modern cars with their helpful diagnostics 😆

They are. Maybe an injector is allowing excessive leak back. I hope is isn't the dreaded self destructing pump syndrome sending metal filings everywhere...

I hope not!

Have the dealership give up on trying to solve the issue mate.

Did you ever find out what the fault was. Mine did exactly the same tonight. Running at 50 hiccup then limp mode,coil light,tyre pressure monitor.  Restart and fine.

18 minutes ago, passatman62 said:

Did you ever find out what the fault was. Mine did exactly the same tonight. Running at 50 hiccup then limp mode,coil light,tyre pressure monitor.  Restart and fine.

A random collection may be a bit more indicative of battery being on its way out unless yours is anything up to a couple of years old (doesn’t rule it out, just less chance)

Travs new battery fitted 6 months ago

9 minutes ago, travs said:

A random collection may be a bit more indicative of battery being on its way out unless yours is anything up to a couple of years old (doesn’t rule it out, just less chance)

Did you ever find out what the fault was. Mine did exactly the same tonight. Running at 50 hiccup then limp mode,coil light,tyre pressure monitor.  Restart and fine.