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2.0 tdi won’t start

Deepsea Nov 16, 2020

  1. Deepsea

    Deepsea New Member

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    2006 A4, 2.0 tdi, 100K miles. Driving at 75 mph. Engine stuttered once lost power then died. Coasted to a stop, battery was too low to crank. Towed home, charged battery. Cranks but no fire, won’t start. Oil level ok, water ok. No cross contamination of oil/water. The only code is for #4 glow plug. No unusual engine noise or idiot lights before it died. Timing belt is ok. All fuses are good including the ones by the computer. Looking for suggestions.
     
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  3. Tiprat

    Tiprat Registered User

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    It could be the crankshaft sensor, mine went recently at similar milage, however I noticed that whilst driving along I'd have sudden "losses" if power. The car was still running but when I pressed the accelerator no increase in motion, then all of a sudden it would be back to normal. Then one morning a couple of days later, it just wouldn't start, new sensor, an hour later, with a fully charged battery it started.
     
  4. Deepsea

    Deepsea New Member

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    Did it give any code for that sensor?
     
  5. Damian_S

    Damian_S Registered User

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    Blocked DPF? High pressure fuel pump?
     
  6. Deepsea

    Deepsea New Member

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    Did a little more troubleshooting last night. Battery charger indicates a full charge @13.2 volts. Turn on the key and it immediately drops to 11.2. Crank the engine and it drops to 7.5- 8 then comes back to 10.0-10.5. Turn off the key and it comes back to 11.5. Battery is right at 1 year old. I’ll remove it tomorrow for a load test.
     
  7. tr7

    tr7 Registered User

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    Can you bump start the car downhill?
     
  8. Retroman

    Retroman Audi A3 2010 Sportback 2.0 TDI 170 (CBBB engine)

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    Those battery readings aren't right! Anything below 12V is 75%+ discharged and would struggle to start a car. Your glow plug faults stored in the ECU may well support a battery problem in that they are not getting enough power to operate properly. Driving with an almost dead battery will also give a range of strange running and electrical problems as the ECU struggles to maintain power to essential features. I've had aftermarket batteries totally fail after just 1-year - it's by no means unknown.
     
  9. Deepsea

    Deepsea New Member

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    Didn’t get to pull the battery today but I did check the plugs and #4 is in fact bad.
     
  10. Deepsea

    Deepsea New Member

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    I have an Audi mechanic telling me if I change one glow plug I must change all four. Never heard of this before. Only the number 4 plug shows a fault. It is in fact bad.
     
  11. Deepsea

    Deepsea New Member

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    Battery failed the load test. New battery installed, 100% charged. Cranks like it should but still won’t start. Got some new codes. p04F9 (air conditioning), p0214 (cold start injector #2), p0722(output speed sensor) but this is a manual transmission, p161A and p161D ( glow plugs #1 and #4). This car was running just fine, going 75 mph then the engine stopped as if the key was turned off.
     
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  13. Deepsea

    Deepsea New Member

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    Is there a way to test for a blocked DPF? Test for the HP pump?
     
  14. Deepsea

    Deepsea New Member

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    Does anyone know how to test the pd’s (injectors)? What voltage is required for them? How to test the pd cable?
     
  15. Pie-eyedpiper

    Pie-eyedpiper Registered User

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    Is your engine BRD or BRE
     
  16. Deepsea

    Deepsea New Member

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    BPW, it’s a German spec car. Can’t find anyone locally with VCDS. Probably going to have to buy or rent it.
     

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