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SEAT IBIZA IV 1.6 TDI - It goes out while driving and does not light

labuda1996 15201 19
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Why does my 1.6 TDI stall while driving and then not start again for about 10 minutes?

The thread points to a common-rail fuel pressure problem, most likely the CR pressure regulating valve / rail pressure control side, because the rail pressure drops to nearly zero during the no-start condition [#17051536] [#17051493] Check the rail pressure with VCDS while cranking and when the fault appears; VCDS has the needed extended measuring blocks for this [#17034197] [#17040958] The running pressures reported were about 24,000 kPa at idle, 34,000 kPa at 1500 rpm, 42,000 kPa at 2000 rpm, and 57,000 kPa at 2500 rpm, so the key clue is the near-zero pressure when it stalls and won’t restart [#17042259] [#17051493] One reply specifically names the CR pressure regulating valve as the suspect, and another advises checking it and the rail regulator for metal filings [#17051536] [#17051794] The valve on the pump can be removed with two hex keys, so it can be inspected or replaced without removing the whole pump [#17056150]
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  • #1 17027053
    labuda1996
    Level 7  
    Posts: 10
    Rate: 4
    Hello,

    please help because my ibiza (1.6tdi 105km 2010) drives me crazy. There are many similar topics but none
    does not describe my case. Well, it starts without any problems, the engine runs smoothly without any strange phenomena.
    The problem appears after a few kilometers (sometimes 5 and sometimes 15 km) - it starts going sluggish as if it is not getting fuel until it goes out.
    Then it does not go off for about 10 minutes - the starter is spinning (the spiral heats up and goes out) but does not light. Sometimes it will catch a moment and go out right away
    only after 10 minutes it lights up as if nothing had happened and I can go on ... It doesn't always happen. There is no rule for this.
    Has anyone had a similar problem?

    PS. fuel filter replaced (nothing), the fuel pump is heard after turning the key (relay 53 turns it on and disconnects from what I observed)

    PS2. when I changed the fuel filter and wanted to fill it by turning the key and turning it off quickly, it was not possible because the fuel flies there in a droplet ..
    Shouldn't there be more pressure from the pump hose, more fuel?
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  • #2 17027318
    szymitsu21
    VIP Meritorious for electroda.pl  
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    And diagnostics?
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  • #3 17027340
    labuda1996
    Level 7  
    Posts: 10
    Rate: 4
    On Monday I will get a mini vaga and give me the mistakes. I understand that it's hard without it, that's why I write with the hope that someone had a similar case.
    We are waiting until Monday then.
  • #4 17027359
    szymitsu21
    VIP Meritorious for electroda.pl  
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    I've had a lot of such cases. Everyone was different :)
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  • #5 17033162
    labuda1996
    Level 7  
    Posts: 10
    Rate: 4
    Ok, I have errors:
    1. P228C00 - Fuel regulator 1 is outside the control limit: Pressure too low-short circuit to positive
    2. P00C600 - Fuel rail pressure is too low-Engine crankshaft-short circuit to ground
    3. P008700 - Fuel rail / system pressure-Too low-No communication signal

    I would like to add that sometimes the revolutions are waving at higher revolutions than idle, i.e. it gas to e.g. 1500rpm and I keep the gas in this position and the revs drop down about 200 rpm for a while and go back to 1500
    over and over again.

    I hope that something concrete can be read from it :D Thanks in advance for your help!

    In googles they say that it can be a pressure control valve on the pump, just how to check it to be sure.
    PS. I have a VAG Mini, I can probably do some more measurements, just guide me so that I do not break anything; d
  • #6 17034197
    endriu233
    Level 21  
    Posts: 718
    Help: 27
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    When it goes off, check when turning what pressure the pump creates on the "rail".
  • #7 17034250
    labuda1996
    Level 7  
    Posts: 10
    Rate: 4
    What to check?
    Is it possible to VAG somehow in measuring blocks? Do you need to connect a pressure gauge?
  • #8 17034283
    endriu233
    Level 21  
    Posts: 718
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    This is how you can check it with a Vag.
  • #9 17037065
    labuda1996
    Level 7  
    Posts: 10
    Rate: 4
    Do you know what channel in measurements? Need to block something at the pump?

    I heard that to check the pump quickly, I can unscrew the regulator from it and see if there are filings? This is true?


    Ps. I noticed that when it is hot, it is uneven at idle.
  • #10 17040958
    endriu233
    Level 21  
    Posts: 718
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    If you have VCDS then you have everything described in extended measurements there.
  • #11 17042259
    labuda1996
    Level 7  
    Posts: 10
    Rate: 4
    I have a pressure measurement on the rail when the engine is running. Relaxed.
    - There is a pressure of 24,000 kPa at idle speed around 800-100rpm
    - 1500rpm revolutions -> pressure 34000 kPa
    - revolutions 2000rpm -> pressure 42000 kPa
    -rotation 2500rpm -> pressure 57000 kPa.

    For now, I do not have a measurement of what the pressure is like when it goes out, but I will. Are the pressures I gave normal?
  • #12 17051493
    labuda1996
    Level 7  
    Posts: 10
    Rate: 4
    I have accurate data in EXCEL from the time it went out while driving and trying to start it.
    file in attachment ibizaCisni..ie.xlsx (35.25 kB)You must be logged in to download this attachment.

    It seems that when I fire after self-extinguishing, the pressure is close to zero. What does it mean?
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  • #13 17051536
    mod22
    Level 28  
    Posts: 883
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    CR pressure regulating valve.
  • #14 17051590
    labuda1996
    Level 7  
    Posts: 10
    Rate: 4
    I suspected so too. I will replace the valve and let you know if it helped.
    Thanks for the quick reply, I can order a part today.
  • #15 17051794
    T5
    Admin of Cars group  
    Posts: 12856
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    In 1.6, the high pressure pump was able to run 60,000 km.
    Check that there are no filings on the regulator in the rail.
  • #16 17051949
    Anonymous
    Anonymous  
  • #17 17052105
    labuda1996
    Level 7  
    Posts: 10
    Rate: 4
    Where is this regulator? I checked the strip, there are only 2 sensors at the beginning and at the end and the regulator is on the CR pump.
    Does anyone know if it can be unscrewed without removing the entire pump? because there is little space. picture: SEAT IBIZA IV 1.6 TDI - It goes out while driving and does not lightibizaRegu..or.jpg (1.63 MB)You must be logged in to download this attachment.


    When it comes to the accident, some small cullet, I suspect it was and where did you conclude it or what about it?
    The problem appeared after about 2 weeks when I bought it, also at the beginning it was ok.
  • #18 17055548
    Anonymous
    Anonymous  
  • #19 17056150
    mod22
    Level 28  
    Posts: 883
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    Of course you can. Two hex keys (5 or 6) and that's it.
  • #20 17059148
    labuda1996
    Level 7  
    Posts: 10
    Rate: 4
    I checked the fuel pump basket and all. Voltage gives 12V for a moment when ignition is also ok.

    I have a question about this valve that I should replace. The one on the rail or the pump? How are they different?
    Does the 1.6 tdi 77kw 2010 wgl have a regulator on the strip or are they some sensors? Someone knows. I bought this valve on the CR pump and will replace it on Monday.



    Edit.
    Replacing the fuel control valve on the CR pump did not help. Follow the same symptoms. Possibly, this regulator remains on the strip.
    In the meantime, I asked the mechanic and he says that my symptoms are similar to a damaged shaft position sensor. But I don't agree with errors ..
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Topic summary

✨ The discussion revolves around a 2010 SEAT Ibiza IV 1.6 TDI experiencing intermittent engine shutdowns while driving. The owner reports that the engine starts normally but becomes sluggish and eventually stalls after a few kilometers. Diagnostic trouble codes (DTCs) indicate issues with fuel pressure regulation, specifically low fuel pressure and potential short circuits. Suggestions include checking the fuel pressure at the rail, inspecting the fuel pressure regulator, and considering the possibility of a faulty shaft position sensor. The owner has replaced the fuel control valve on the common rail pump but continues to experience the same symptoms, prompting further investigation into the fuel system components.
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FAQ

TL;DR: Seat Ibiza 1.6 TDI stalling/no-start often traces to low CR pressure; pump life can be 60,000 km, and "Check that there are no filings" on the rail regulator. [Elektroda, T5, post #17051794]

Why it matters: For Seat Ibiza IV 1.6 TDI owners chasing random stalls and 10‑minute no‑starts, this guides fast, accurate checks.

Quick Facts

What do fault codes P228C00, P00C600, and P008700 mean here?

These codes point to insufficient common‑rail pressure and a faulty control component. An expert reply summed it as "CR pressure regulating valve." Focus diagnosis on the rail pressure control and its wiring. Confirm by reading actual pressure during cranking and hot idle. Replace parts only after measurement. [Elektroda, mod22, post #17051536]

How do I check rail pressure immediately after the engine stalls?

Use your diagnostic tool to watch rail pressure while cranking. "When it goes off, check when turning what pressure the pump creates." How‑To:
  1. Connect VCDS, select Engine, open Measuring Blocks or Live Data.
  2. Log Fuel Rail Pressure (actual) during cranking for 10–15 seconds.
  3. Save the log for comparison against specified. This captures the data needed for further checks. [Elektroda, endriu233, post #17034197]

What rail pressure values were observed at idle and higher RPM?

In this thread, the Ibiza logged about 24,000 kPa at idle. It rose to ~34,000 kPa at 1,500 rpm. Around 42,000 kPa at 2,000 rpm. About 57,000 kPa at 2,500 rpm. Use these values to judge trend during testing. [Elektroda, labuda1996, post #17042259]

After a stall, my cranking rail pressure is near zero. What does that indicate?

It indicates the rail is not building pressure while cranking. An expert answer in the thread pointed to the "CR pressure regulating valve." Test that valve and its connector. Inspect for contamination and mechanical sticking. Verify wiring and grounds before replacing parts. [Elektroda, mod22, post #17051536]

Where is the regulator, and can I remove it without pulling the pump?

On this engine, you can remove the CR pump’s regulator in place. Space is tight, but it is doable. Use two hex keys, size 5 or 6, as noted by a moderator. Replace the O‑ring and keep everything clean. Work on a cool engine for safety. [Elektroda, mod22, post #17056150]

I already replaced the pump control valve and it still stalls. What should I check next?

Check the rail’s pressure regulator for metal filings. "Check that there are no filings on the regulator in the rail." Finding filings suggests high‑pressure pump wear. In the 1.6 TDI, pumps have failed as early as 60,000 km. Document findings before buying more parts. [Elektroda, T5, post #17051794]

How do I inspect for metal filings on the rail regulator?

Depressurize and disconnect the battery. Remove the rail regulator carefully and inspect its screen for glitter. "Check that there are no filings on the regulator in the rail." If you see filings, stop further driving and consult a diesel specialist. Keep debris out during reassembly. [Elektroda, T5, post #17051794]

Can VCDS or a Mini VAG interface read what I need?

Yes. VCDS provides Extended Measurements that include rail pressure and related values. Use it to compare specified and actual values. This speeds diagnosis without guesswork. "If you have VCDS then you have everything described in extended measurements there." Ensure a stable connection and log while driving. [Elektroda, endriu233, post #17040958]

Could a camshaft or crankshaft position sensor cause similar stalling?

It was suggested after a valve replacement in this case. The owner reported a mechanic suspected a shaft position sensor. That idea surfaced alongside fuel pressure faults. Evaluate sensor signals if pressure appears normal in logs. Prioritize tests based on recorded data. [Elektroda, labuda1996, post #17059148]

Is uneven hot idle and throttle surge linked to fuel pressure regulation?

Yes, it aligns with unstable fuel pressure control. The owner noted a 200 rpm dip while holding 1,500 rpm. Hot idle was also uneven. Capture logs at those conditions to confirm. Address regulation and supply first. [Elektroda, labuda1996, post #17033162]

Could a past crash affect fuel pickup or delivery?

Yes. A broken guide for the in‑tank pump basket after a crash can cause erratic fueling. The basket can move and uncover the pickup. This creates intermittent starvation that mimics pressure faults. Inspect the tank module if the car had accident repairs. [Elektroda, Anonymous, post #17055548]

How long can the Ibiza refuse to restart after it dies?

In this case, it would not restart for about 10 minutes. During that period, the starter turned, and the glow lamp behaved normally. After cooling a bit, it restarted as if nothing happened. Log cranking pressure during that window for clarity. [Elektroda, labuda1996, post #17027053]

Which relay powers the in‑tank fuel pump here?

The thread author observed Relay 53 switching the pump with ignition. You may hear the pump briefly prime. Confirm by listening and checking the relay numbering. Verify your vehicle’s diagram before testing. [Elektroda, labuda1996, post #17027053]

I tried key‑cycling to prime after a filter change and only saw droplets. What now?

Do not judge by visual flow alone. Verify low‑side and rail pressure with diagnostics. "This is how you can check it with a Vag." Use VCDS live data instead of repeated key‑cycling. That avoids misinterpretation and wasted time. [Elektroda, endriu233, post #17034283]

What data should I log to accelerate diagnosis?

Log fuel rail pressure actual during the stall and cranking. Export the session to Excel or CSV for sharing. The author attached such a log when the engine died. Include timestamps and operating conditions. This enables targeted advice and next tests. [Elektroda, labuda1996, post #17051493]
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