Limp Mode + ESP/EML light and struggling to start (codes in thread!)

Discussion in 'Audi TDI forums' started by magsmagsmags, Aug 4, 2013.

  1. magsmagsmags

    magsmagsmags New Member

    Joined:
    Aug 4, 2013
    Messages:
    3
    Car:
    Audi A4 2.0 TDI 140 B7
    Hey everyone, this is my first post here, although i've also posted this up on the VW Audi Forum to get as much input as possible.

    Just bought an 2007 Audi A4 TDI 2.0 TDV 140 (VIN: 8E, Engine: BRE)
    I bought the car as spares or repair with the intention of repairing it.

    The car is in limp mode, it limits at ~3200 RPM, it struggles to start (takes around 10 seconds of turning over) and the engine is running slightly lumpy, particularly at idle but you cannot feel any misfire accelerating or cruising - it's just slow! The engine management light and ESP light are illuminated. When I clear the codes, the EML light will stay off for a while but always comes back on, the car stays in limp mode regardless. I drove the car 150 miles home, and it didn't miss a beat the whole way, once it's cruising, aside from the low power its smooth and quiet.

    The person I bought it off claims to have tried 'everything', although I know this does not include injectors, looms and harnesses.

    Today I tried some typical basic steps just to see what the result would be.
    - Fuel filter: This was replaced
    - Fuel pump / relay: Not checked directly, but while the filter was off i primed the pump and started the car, fuel was being delivered.
    - MAF clean: Cleaned with proper cleaner. Also tried unplugging it
    - MAF harness voltages: Reading... Pin 5: 0 / Pin 4: 1.5 / Pin 3: 12.8 / Pin 2: 0 (All taken at idle)
    - Injector cleaner: Put in the fuel filter on install and ran through.
    - Battery - only puts out 11v under load, tried a friends battery (680CCA and 75AH, brand new) however and no luck.

    Only 'result' was a slight improvement in starting. Previously it would go through 3 'stages': Cranking, half firing (imagine cold starting an old diesel with knackered glow plugs) then it would actually fire and run. Now it just cranks for up to 10 seconds, then fires straight away


    I also used a Snap-On Solus scanner, Cleared the codes, took it for a drive and re-read them. These are what was found...

    Under engine management:
    01618 Sensor Reference Voltage B: Too Low P0652

    Under brake electronics:
    01312 Powertrain Data Bus Malfunction Intermitent
    00532 Supply Voltage B+ Lower Limit Reached Intermittent
    01316 ABS Control Module Not A Plausable Signal Intermittent

    Under airbag: (did this last and cleared it, so may not be relevant, not checked if it's come back or not as not had a scanner)
    00532 Supply Voltage B + Power Supply Voltage Too Low Intermittent

    Those are all the codes I pulled.
    The ECU has already been sent off for testing (receipt to prove) and came back without fault.
    I have a VagCom cable on the way, which should be here Tuesday so I can perform more tests and readings etc, but hopefully these codes and symtpoms are somewhere to start. Obviously I have some money to use to fix it, but I don't want to go blindly throwing parts and money at it for no reason, so any help will be appreciated.

    Thanks in advance, if i've missed anything, let me know.
     
  2. Keithuk

    Keithuk Super Moderator

    Joined:
    Aug 29, 2010
    Messages:
    7,093
    Car:
    2010 Golf GTD (170) CBBB
    Location:
    Stoke on Trent, England
    Welcome to the forum. welcometomyturbodies

    Limp mode: What is it, what are the causes, and how to fix it for the Audi and VW TDI diesel turbo


    VAG Error Code: 17036
    EOBD II Error Code: P0652

    Fault Location:
    Sensor Reference Voltage 'B' - Circuit Low

    Possible Cause:
    Malfunction Indicator Lamp (MIL)(K83) active.

    Wiring short to earth.
    Shorted sensor on 5 volt circuit.
    Fuse(s).
    Wiring/Connectors from/to Intake Manifold Pressure Sensor (G31) faulty.
    Intake Manifold Pressure Sensor (G31) faulty.
    Engine Control Module (ECM) harness is open or shorted.
    Engine Control Module (ECM) circuit poor electrical connection.
    Engine Control Module (ECM) faulty.

    Possible Solutions:
    Check Wiring/Connectors from/to Intake Manifold Pressure Sensor (G31).
    Check/Replace Intake Manifold Pressure Sensor (G31).
    Check Wiring/Connectors from/to Engine Control Module (ECM).
    Replace Engine Control Module (ECM).

    Special Notes:
    When found in 1.9l TDI (BEW):
    Check Atmospheric Pressure (MVB 010.2) and Intake Manifold Pressure Sensor (MVB 010.3). Compare both Values with Engine OFF, the Tolerance should be +/- 50 mbar.
    Check Variable Nozzle Turbo (VNT).
    When found in other engines:
    Check the factory repair manual since this fault can point to problems with several different sensors.
    Specifically in the BLB engine, faulty MAF wiring can trigger it.

    When is the code detected?:
    The Engine Control Module (ECM) has detected the sensor 5 volt reference circuit voltage is lower than expected.


    VAG Error Code: 01312

    Fault Location:
    Powertrain Data Bus - Faulty/Defective

    Possible Cause:
    Malfunction Indicator Lamp (MIL)(K83) active.
    Poor vehicle handling.
    Possibly wrong displays in the dash panel insert.

    Databus Wiring and/or Connector(s) faulty.

    Possible Solutions:
    Check Data BUS Wiring and/or Connector(s) Chapter 90-9.
    Skoda-Fabia 2000-Electrical.pdf


    VAG Error Code: 00532

    Fault Location:
    Supply Voltage B+ - Signal too Low

    Possible Cause:
    Wiring/Connectors from/to Control Module faulty.
    Power Supply (Battery/Generator) faulty.

    Possible Solutions:
    Check/Repair Wiring/Connectors from/to Control Module.
    Check Power Supply (Battery/Generator).

    Special Notes:
    When found in an individual control module, it's most likely a local source (e.g. wiring/connectors).
    When found in multiple control modules at the same time, it's most likely a common source (e.g. earth spot, battery, generator).
    Intermittent codes are often stored during low outside temperature when the battery capacity goes down and may be ignored.
    Common with 16946/P0562/001378 - System Voltage: Too Low stored in other control modules.


    VAG Error Code: 01316

    Fault Location:
    Anti-Lock Brake System (ABS) Control Module - No Signal/No Communication

    Possible Cause:
    Wiring/Connector(s) from/to ABS Control Module faulty.
    Fault(s) stored in ABS Control Module.

    Possible Solutions:
    Check Wiring/Connector(s) from/to ABS Control Module.
    Check Measuring Value Blocks (MVB).
    Usually Measuring Value Blocks (MVB) 125+ show the current Communication Status.


    VAG Error Code: 00532

    Fault Location:
    Supply Voltage B+ - Signal too Low

    Possible Cause:
    Wiring/Connectors from/to Control Module faulty.
    Power Supply (Battery/Generator) faulty.

    Possible Solutions:
    Check/Repair Wiring/Connectors from/to Control Module.
    Check Power Supply (Battery/Generator).

    Special Notes:
    When found in an individual control module, it's most likely a local source (e.g. wiring/connectors).
    When found in multiple control modules at the same time, it's most likely a common source (e.g. earth spot, battery, generator).
    Intermittent codes are often stored during low outside temperature when the battery capacity goes down and may be ignored.
    Common with 16946/P0562/001378 - System Voltage: Too Low stored in other control modules.


    As taken from my Free EOBD II Error Codes software
     
  3. magsmagsmags

    magsmagsmags New Member

    Joined:
    Aug 4, 2013
    Messages:
    3
    Car:
    Audi A4 2.0 TDI 140 B7
    Thanks for the detailed reply, I had already looked up the codes but your reply had more information on each code than what i'd been able to find.

    Seeing as there are multiple faults being reported on different control modules, do you think it's safe to assume there is some overall fault (ground / wiring issue perhaps) that is causing the fault?

    As far as I know (and please correct me if i'm wrong!), if there is a problem (faulty sensor, shorted wire etc) on the 5v sensor circuit, it can cause these codes.
    I'm hoping when my VCDS cable arrives today i can use it to pinpoint the cause, or at least narrow it down - any suggestion on what diagnostics to run? I can report back with logs.
     
  4. magsmagsmags

    magsmagsmags New Member

    Joined:
    Aug 4, 2013
    Messages:
    3
    Car:
    Audi A4 2.0 TDI 140 B7
    VCDS cable came today.

    I ran a scan and did a map sensor (ignition on / engine off) test following this guide: HOW TO - Check your intake manifold pressure sender (G71) using Vagcom/VCDS - VW T4 Forum - VW T5 Forum

    The result is as follows:
    [​IMG]
    Atmos pressure fluctuates wildly between 999 and 1099, according to the guide these should be stable, and also the values of boost and atmos pressure should be close, which they are not.

    These are the fault codes pulled, no changes really but posting anyway:

    Engine module:

    From ABS module:
    Edit: I've since tested it with the engine running and taken it for a drive both with and without the MAF and MAP sensor being plugged in. The values do not change. When the engine is on the MAF reading is always 550
     
    Last edited by a moderator: Aug 5, 2013
  5. Keithuk

    Keithuk Super Moderator

    Joined:
    Aug 29, 2010
    Messages:
    7,093
    Car:
    2010 Golf GTD (170) CBBB
    Location:
    Stoke on Trent, England
    VAG Error Code: 01314

    Fault Location:
    Engine Control Module (ECM) - No Communication

    Possible Cause:
    CAN-Data BUS Wiring/Connectors from/to Engine Control Module (ECM) faulty.
    Fault(s) stored in Engine Control Module (ECM).
    Engine Control Module (ECM) recently flashed or re-mapped.

    Possible Solutions:
    Check CAN-Databus Wiring/Connectors from/to Engine Control Module (ECM).
    Check Measuring Value Blocks (MVB).
    Usually Measuring Value Blocks (MVB) 125+ show the current Communication Status.
    Check Data BUS Chapter 90-9.
    Skoda-Fabia 2000-Electrical.pdf


    VAG Error Code: 01314

    Fault Location:
    Engine Control Module (ECM) - Check DTC Memory

    Possible Cause:
    Fault(s) stored in Engine Control Module (ECM).

    Possible Solutions:
    Check Engine Control Module (ECM) for fault codes.

    Special Notes:
    Engine Control Module (ECM) stored a Code which influences other Control Modules Functionality.
    To clear this Fault Code you will need to correct the Problem in the Engine Control Module (ECM) first.


    The funny thing is I didn't have P1858 until yesterday I could only find bits of info if I google it I also found 4 more codes which I've now added.

    VAG Error Code: 18266
    EOBD II Error Code: P1858

    Fault Location:
    Engine Speed (RPM) Sensor (G28) Error Message from ECU - Intermittent

    Possible Cause:
    Wiring.
    Engine Speed (RPM) Sensor (G28).
    Engine Control Module (ECM).
     
  6. simon guy

    simon guy New Member

    Joined:
    Jun 11, 2017
    Messages:
    1
    Car:
    2008 vw golf tdi 2.0 gt 170
    Location:
    shefford
    Mods:
    nil
    hi all, im new to this site.....
    can anyone help......
    my golf has decided not to start anymore. after plugging it in i discovered engine code 17036/P0652/001618 which i couldnt even remove?

    I have looked everywhere online but still nothing very clear?
    It tells me to check or replace the intake manifold pressure sensor? can i hell find where it is? am i looking at the rong parts?
    I am more than capable of carry out the fix but i do need to do some research before i start?

    Help needed please

    Thanks in advance

    Si
     

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