EPC warning

[fourstardan]

Driving along I felt a slip in the engine is only how I can describe it.

EPC light came up and went into limp mode.

Pulled over for 5 minutes turned off the engine back on again and it was fine.

No fault codes on the OBD which is weird.

Any ideas?

[Belle427]

Cant really do a lot, if it starts and drives as normal then just carry on using it and see how it goes.

[Dr G]

Can you offer any more detail on the "slip"? What car is it? What were you doing when it happened?

[fourstardan]

Slip is a reduction in power, im assuming where it chucks me into limp mode.

It happened again yesterday accerlating up a slight hill into 50mph and with the car not fully warmed up.

I've posted on some FB groups and similar symptoms from others have been Turbo actuator related.

I'm not seeing any codes on my device (Ancel v500) but im not sure if thats because the device isn't picking this part of fault codes for the ECU up.

[normalbloke]

Do we have to guess the car/engine/year?

[fourstardan]

normalbloke said:

Do we have to guess the car/engine/year?

Im sorry what a numpty.

It's a Passat 2016 TDI 2.0.

I've been out today and not had any issues, I also read somewhere about putting some diesel cleaner in, thoughts on that?

[Doesitdrive]

Before you do anything get the battery checked , if it ain't perfect change it.

[Drive Blind]

you need a better code reader eg vcds

or find a local VW group specialist to read the error code.

[normalbloke]

Yep, get the codes read. Many of the 2.0 diesel of that era have two separate oil pressure sensors, one for low, and another for high. The high pressure sensor is known to fail( clogged gauze) and will give exactly the symptoms you describe. Sensor is about £30 and easily accessible on the front of the block. Maybe!

[fourstardan]

Doesitdrive said:

Before you do anything get the battery checked , if it ain't perfect change it.

Is the original battery so could also be another possible candidate!

[Dr G]

fourstardan said:

Slip is a reduction in power, im assuming where it chucks me into limp mode.

20 years in the trade and the first time I've heard slip used to describe a lack of power.

Agreed on the above comments, you'll want something VAG specific to pull codes if you're doing it yourself. Sticking actuator can come/go as you describe but will log a code.

My in-laws recently had what appeared to be a good result with a bottle of Wynn's diesel turbo clear on a 1.6 TDI they needed to behave for a month or so before it was replaced. Had been throwing EML (and limp mode) for actuator codes regularly before treatment was used. Whilst they only continued to drive it for a few weeks afterwards it appeared to do the trick.

[catso]

Doesitdrive said:

Before you do anything get the battery checked , if it ain't perfect change it.

Agreed, on previous Audi (A3) I saw multiple errors due to low battery.

You need to get a scan by VCDS or similar to see what the problem was.

[Doesitdrive]

catso said:

Doesitdrive said:

Before you do anything get the battery checked , if it ain't perfect change it.

Agreed, on previous Audi (A3) I saw multiple errors due to low battery.

You need to get a scan by VCDS or similar to see what the problem was.

I bought a Fiesta auto the main agent had diagnosed with a fked gearbox.

When I went to pick it up it was deader than dead.

New battery, new gearbox lol.

Honestly, people are going to maib agents and independent garages for diagnosis and none of them check the battery.

[fourstardan]

I've just tested the battery and I'm getting 12v when off and 13 on.

[Dr G]

Wants to go on a condition tester rather than simple multimeter.

Cheap on Amazon, we use this one:

https://www.amazon.co.uk/dp/B08H8DT2MF?ref_=ppx_hz...

...if you like buying tools, or any tyre place, RAC etc. will test it for you for free.

[Doesitdrive]

This car was an example of poor main agent diagnosis.

It was brought ib because of fumes getting into cabin.

Plugged it in and said it needs a new engine as there is air getting into a cylinder, cracked block lol.

Must have sold a replacement, with the usual 100% mark up they wanted 200 quid for it, yep, profit on everything.

Dropped it with my son, not a mechanic, a salesmen, rang me 15 mins later with his diagnosis with nothing Plugged in.

Injector seal had failed. Guess who was right.

[Belle427]

Doesitdrive said:

This car was an example of poor main agent diagnosis.

It was brought ib because of fumes getting into cabin.

Plugged it in and said it needs a new engine as there is air getting into a cylinder, cracked block lol.

Must have sold a replacement, with the usual 100% mark up they wanted 200 quid for it, yep, profit on everything.

Dropped it with my son, not a mechanic, a salesmen, rang me 15 mins later with his diagnosis with nothing Plugged in.

Injector seal had failed. Guess who was right.

They don`t want to know jobs like this as they can quickly turn into a nightmare if things don`t go well. Sometimes the thread goes in the injector clamp bolts and its a real pita then.
The mess a chuffing injector causes is hideous too.

[Doesitdrive]

Belle427 said:

Doesitdrive said:

This car was an example of poor main agent diagnosis.

It was brought ib because of fumes getting into cabin.

Plugged it in and said it needs a new engine as there is air getting into a cylinder, cracked block lol.

Must have sold a replacement, with the usual 100% mark up they wanted 200 quid for it, yep, profit on everything.

Dropped it with my son, not a mechanic, a salesmen, rang me 15 mins later with his diagnosis with nothing Plugged in.

Injector seal had failed. Guess who was right.

They don`t want to know jobs like this as they can quickly turn into a nightmare if things don`t go well. Sometimes the thread goes in the injector clamp bolts and its a real pita then.
The mess a chuffing injector causes is hideous too.

It was a mess but they has no idea as they didn't even open the cover, doubt they opened the bonnet lol, plug in only.

Bolts are fine if careful, it's the plastic clips that are a pita, but have a new set ready and it's no big deal.

200 car, 60 quid in parts, 10 in cleaning st, and the new owner is very happy with his £2500 2014:Galaxy TItanium automatic.

It had recently had the gearbox replaced too.

[fourstardan]

Went yesterday and only seems to do when cold. Turned off immediately back on and it had gone.

Ill have to get this into a garage for a scan.

[catso]

fourstardan said:

Went yesterday and only seems to do when cold. Turned off immediately back on and it had gone.

Ill have to get this into a garage for a scan.

Low battery on startup IMO.

My old A3 would only ever bring up errors (including DSG gearbox shutting down to no drive) after starting on a low battery.

Once switched off and restarted (battery has a bit more charge) it would be fine.