VW 2012 Transporter engine CAAC loosing power above 2k rpm

   #1  

ghosthd80

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hi All
my name is Sly I never actually post anything in here but time has come
I`m struggling with above vehicle for probably more than 2 months and following Peter from Ross-Tech advise would like ask for help here
just to let you all know I would like to offer reward of £50 (bank transfer or PayPal ) to the person who will help me solve this nightmare

VW Transporter 2L TDI engine code CAAC
van is loosing power above 2k rpm after power drops down it starts powering again
no fault codes at all
new turbo charger fitted, new EGR fitted , DPF was removed by previous owner
vacuum and pipes also checked
all readings via VCDS correct nothing unusual at all
if anyone have any ideas please help all welcome
please find scan below and some pictures with graph

https://ibb.co/BZbSh7S

Code:
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Chassis Type: 7H-VN75 (6N0)
Scan: 01 03 04 08 09 10 15 17 18 19 25 56 0B

VIN: WV2ZZZ7HZCH042255   Mileage: 217130km-134918miles

01-Engine -- Status: Sporadic communication error 1000
03-ABS Brakes -- Status: Malfunction 0010
04-Steering Angle -- Status: OK 0000
08-Auto HVAC -- Status: Malfunction 0010
09-Cent. Elect. -- Status: Malfunction 0010
10-Park/Steer Assist -- Status: OK 0000
15-Airbags -- Status: OK 0000
17-Instruments -- Status: OK 0000
18-Aux. Heat -- Status: Malfunction 1010
19-CAN Gateway -- Status: Malfunction 0010
25-Immobilizer -- Status: OK 0000
56-Radio -- Status: Malfunction 1010
 
-------------------------------------------------------------------------------
Address 01: Engine (J623-CAAC)       Labels:. 03L-906-022-CAA.clb
   Part No SW: 03L 906 022 CH    HW: 03L 907 309 K
   Component: R4 2,0L EDC   H43 9970
   Revision: 26H43---    Serial number: 00000000000000 CVN: D8995D5B
   Coding: 0119401A230400080000
   Shop #: WSC 92521 052 00000
   ASAM Dataset: EV_ECM20TDI01103L906022CH 002013
   ROD: EV_ECM20TDI01103L906022CH_002.rod
   VCID: 6DD1187BBCDBDAE598-8038
   VINID: 9E60AAAAA1D8A93600102085140D7360E2

No fault code found.
Readiness: 0 0 0 0 1

-------------------------------------------------------------------------------
Address 03: ABS Brakes (-----)       Labels: 7E0-907-37x-MK25AXT.clb
   Part No SW: 7E0 907 379 H    HW: 7E0 907 379 E
   Component: ESP MK25A XT  H43 0107
   Revision: 00H43001 
   Coding: 208724AD09A8049724A49076AA6310
   Shop #: WSC 02756 790 49152
   VCID: 377DFA138607A035B2-8062

5 Faults Found:
00287 - ABS Wheel Speed Sensor; Rear Right (G44)
            012 - Electrical Fault in Circuit - Intermittent
             Freeze Frame:
                    Fault Status: 00101100
                    Fault Priority: 1
                    Fault Frequency: 1
                    Reset counter: 35
                    Time Indication: 0

             Freeze Frame:
                    Count: 16512
                    Count: 257
                    Count: 80
                    Count: 762

00290 - ABS Wheel Speed Sensor; Rear Left (G46)
            012 - Electrical Fault in Circuit - Intermittent
             Freeze Frame:
                    Fault Status: 00101100
                    Fault Priority: 1
                    Fault Frequency: 1
                    Reset counter: 35
                    Time Indication: 0

             Freeze Frame:
                    Count: 16512
                    Count: 257
                    Count: 64
                    Count: 762

00668 - Supply Voltage Terminal 30
            002 - Lower Limit Exceeded - Intermittent
             Freeze Frame:
                    Fault Status: 00100010
                    Fault Priority: 1
                    Fault Frequency: 1
                    Reset counter: 37
                    Mileage: 217037 km
                    Time Indication: 0
                    Date: 2017.03.15
                    Time: 05:39:50

             Freeze Frame:
                    Count: 16512
                    Count: 2305
                    Count: 128
                    Count: 762

01314 - Engine Control Module
            004 - No Signal/Communication - Intermittent
             Freeze Frame:
                    Fault Status: 00100100
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 44
                    Mileage: 217111 km
                    Time Indication: 0
                    Date: 2017.03.20
                    Time: 01:50:47

             Freeze Frame:
                    Count: 16512
                    Count: 1
                    Count: 8194
                    Count: 762

00287 - ABS Wheel Speed Sensor; Rear Right (G44)
            003 - Mechanical Failure - Intermittent
             Freeze Frame:
                    Fault Status: 00100011
                    Fault Priority: 1
                    Fault Frequency: 1
                    Reset counter: 247
                    Mileage: 216961 km
                    Time Indication: 0
                    Date: 2017.03.06
                    Time: 00:09:37

             Freeze Frame:
                    Count: 16384
                    Count: 1
                    Count: 83
                    Count: 512


-------------------------------------------------------------------------------
Address 08: Auto HVAC (J301)       Labels:| 7E5-907-047.clb
   Part No SW: 7E5 907 047 BA    HW: 7E5 907 047 BA
   Component: Climatic-T5   H19 0404
   Revision: 00001009 
   Coding: 0000000002
   Shop #: WSC 02756 790 50316
   ASAM Dataset: EV_ClimaticT5 A01003
   ROD: EV_ClimaT5Basis.rod
   VCID: 6FED0273B6D728F5AA-803A

2 Faults Found:
13701376 - Function Restricted due to Missing Message(s)
          U1111 00 [008] - -
          [New feature! Extended UDS fault detail is only supported by current gen. interfaces]
          Intermittent - Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 6
                    Fault Frequency: 1
                    Reset counter: 44
                    Mileage: 217111 km
                    Date: 2022.10.28
                    Time: 02:00:20

9481200 - Refrigerant Pressure
          B10AB F0 [009] - Too Low
          Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 4
                    Mileage: 217111 km
                    Date: 2022.10.28
                    Time: 02:00:22


-------------------------------------------------------------------------------
Address 09: Cent. Elect. (J519)       Labels:. 7H0-937-08x-09.clb
   Part No SW: 7H0 937 087 H    HW: 7H0 937 087
   Component: BCM T5GP H+4  H47 0251
   Revision: BO047001    Serial number: 0429 242110850
   Coding: A0B0793A0E612413922048102C2B8DD40000410F60040000300000000000
   Shop #: WSC 02756 790 00000
   VCID: 3979FC2BB013B64544-806C

   Subsystem 1 - Part No SW: 7E0 959 801 B    HW: 7E0 959 801 B  Labels: 7E0-959-80X-V1.CLB
   Component: J386__TSG_FT  002 3311
   Serial number: --------------------
   Coding: 010000

   Subsystem 2 - Part No SW: 7E0 959 802 B    HW: 7E0 959 802 B  Labels: 7E0-959-80X-V1.CLB
   Component: J387__TSG_BT  002 3311
   Serial number: --------------------
   Coding: 000000

   Subsystem 3 - Part No: 7E1 951 171
   Component: DWA-Sensor 00  001 0104
   Coding: 000000

   Subsystem 4 - Part No: 1K0 951 605 C
   Component: LIN BACKUP HO  H05 1501
   Coding: 000000

   Subsystem 5 - Part No: 7E1 951 171
   Component: DWA-Sensor 00  001 0104
   Coding: 000000

13 Faults Found:
03430 - Terminal 30 for Turn Signals and Brake Lights
            011 - Open Circuit - Intermittent
             Freeze Frame:
                    Fault Status: 00101011
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 31
                    Time Indication: 0

01758 - Bulbs for Brake Lamps
            011 - Open Circuit - Intermittent
             Freeze Frame:
                    Fault Status: 00101011
                    Fault Priority: 2
                    Fault Frequency: 34
                    Reset counter: 35
                    Mileage: 217037 km
                    Time Indication: 0
                    Date: 2017.03.07
                    Time: 09:26:07

03431 - Activation of Left Parking Light
            011 - Open Circuit - Intermittent
             Freeze Frame:
                    Fault Status: 00101011
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 35
                    Time Indication: 0

03432 - Activation of Right Parking Light
            011 - Open Circuit - Intermittent
             Freeze Frame:
                    Fault Status: 00101011
                    Fault Priority: 2
                    Fault Frequency: 13
                    Reset counter: 35
                    Time Indication: 0

03435 - Terminal 30 for Interior Light and Parking Light
            011 - Open Circuit - Intermittent
             Freeze Frame:
                    Fault Status: 00101011
                    Fault Priority: 3
                    Fault Frequency: 22
                    Reset counter: 31
                    Time Indication: 0

00329 - Control Circuit for Unlocking Rear Lid
            011 - Open Circuit - Intermittent
             Freeze Frame:
                    Fault Status: 00101011
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 35
                    Time Indication: 0

03304 - Response Closing Status of Rear Right Door
            008 - Implausible Signal - Intermittent
             Freeze Frame:
                    Fault Status: 00101000
                    Fault Priority: 2
                    Fault Frequency: 23
                    Reset counter: 43
                    Mileage: 216955 km
                    Time Indication: 0
                    Date: 2017.03.04
                    Time: 06:29:24

03396 - Supply voltage terminal 30 for central locking
            011 - Open Circuit - Intermittent
             Freeze Frame:
                    Fault Status: 00101011
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 31
                    Time Indication: 0

00920 - Heated Outside Mirrors; Driver Side (Z4) / Passenger Side (Z5)
            006 - Short to Plus - Intermittent
             Freeze Frame:
                    Fault Status: 00100110
                    Fault Priority: 3
                    Fault Frequency: 1
                    Reset counter: 35
                    Mileage: 217037 km
                    Time Indication: 0
                    Date: 2017.03.07
                    Time: 07:53:38

00532 - Supply Voltage B+
            002 - Lower Limit Exceeded - Intermittent
             Freeze Frame:
                    Fault Status: 00100010
                    Fault Priority: 3
                    Fault Frequency: 2
                    Reset counter: 35
                    Mileage: 217037 km
                    Time Indication: 0
                    Date: 2017.03.15
                    Time: 05:40:10

00532 - Supply Voltage B+
            011 - Open Circuit - Intermittent
             Freeze Frame:
                    Fault Status: 00101011
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 31
                    Time Indication: 0

00446 - Function Limitation due to Under-Voltage
            002 - Lower Limit Exceeded - Intermittent
             Freeze Frame:
                    Fault Status: 00100010
                    Fault Priority: 6
                    Fault Frequency: 6
                    Reset counter: 35
                    Mileage: 217037 km
                    Time Indication: 0
                    Date: 2017.03.15
                    Time: 00:08:17

03156 - Sensor for Anti-Theft System (G578)
            004 - No Signal/Communication - Intermittent
             Freeze Frame:
                    Fault Status: 00100100
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 43
                    Mileage: 217075 km
                    Time Indication: 0
                    Date: 2017.03.20
                    Time: 02:42:35


-------------------------------------------------------------------------------
Address 10: Park/Steer Assist (J446)       Labels:| 7E0-919-475.clb
   Part No SW: 7E0 919 475 E    HW: 7E0 919 475 A
   Component: PARKHILFE 8K  H11 0013
   Revision: --------    Serial number: 47401119501541
   Coding: 108001
   Shop #: WSC 02756 790 50316
   ASAM Dataset: EV_VW75XParkAssis8K A01005
   ROD: EV_VW75XParkAssis8K_A01.rod
   VCID: 3467CD1F9F714B2D97-8060

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags (J234)       Labels:| 5K0-959-655.clb
   Part No SW: 7E0 959 655 B    HW: 7E0 959 655 B
   Component: VW10Airbag009 H06 0013
   Revision: --------    Serial number: 003HL007GJPM
   Coding: 000000000000000000000000000000003039
   Shop #: WSC 02754 790 50316
   ASAM Dataset: EV_AirbaVW10BPAVN750 A01026
   ROD: EV_AirbaVW10BPAVN750.rod
   VCID: 3561F01B940B5225A0-8060

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments (J285)       Labels:| 5K0-920-xxx-17.clb-SRI1
   Part No SW: 7E0 920 970 E    HW: 7E0 920 970 E
   Component: KOMBI         H04 0305
   Serial number: 00000000000000
   Coding: 460C00
   Shop #: WSC 02756 790 50316
   ASAM Dataset: EV_Kombi_UDS_VDD_RM09 A04113
   ROD: EV_Kombi_UDS_VDD_RM09_004_VW36.rod
   VCID: 2C57D57F474113EDCF-8078

No fault code found.

-------------------------------------------------------------------------------
Address 18: Aux. Heat        Labels: 7E0-815-071.clb
   Part No: 7E0 815 071 C
   Component: J737__Standheizung  0605
   Revision: 00087000    Serial number: 09024900A00000
   Coding: 0000031
   Shop #: WSC 00000 000 00000
   VCID: 2541205BECAB22A510-8070

3 Faults Found:
01413 - Dosing/Metering Pump (V54)
            007 - Short to Ground
             Freeze Frame:
                    Fault Status: 01100111
                    Fault Priority: 3
                    Fault Frequency: 1
                    Reset counter: 255
                    Mileage: 216985 km
                    Time Indication: 0
                    Date: 2017.03.06
                    Time: 02:02:56

             Freeze Frame:
                        Start
                    Temperature: 28.0°C
                    Voltage: 10.68 V
                    Temperature: 15.5°C

01582 - Signal for Coolant Temperature
            004 - No Signal/Communication - Intermittent
             Freeze Frame:
                    Fault Status: 00100100
                    Fault Priority: 6
                    Fault Frequency: 1
                    Reset counter: 255
                    Mileage: 217111 km
                    Time Indication: 0
                    Date: 2017.03.20
                    Time: 01:50:48

             Freeze Frame:
                        OFF
                    Temperature: 76.0°C
                    Voltage: 11.90 V
                    Temperature: 21.5°C

01126 - Engine Speed Signal
            004 - No Signal/Communication - Intermittent
             Freeze Frame:
                    Fault Status: 00100100
                    Fault Priority: 6
                    Fault Frequency: 1
                    Reset counter: 255
                    Mileage: 217111 km
                    Time Indication: 0
                    Date: 2017.03.20
                    Time: 01:50:48

             Freeze Frame:
                        OFF
                    Temperature: 76.0°C
                    Voltage: 11.90 V
                    Temperature: 21.5°C


-------------------------------------------------------------------------------
Address 19: CAN Gateway (J533)       Labels:. 6N0-909-901-6R.clb
   Part No SW: 6N0 909 901     HW: 7H0 937 087
   Component: GW-K-CAN TP20 H47 0251
   Revision: BO047001 
   Coding: 042300
   Shop #: WSC 02756 790 00000
   VCID: 70EF010FA3E9370DB3-8024

3 Faults Found:
01314 - Engine Control Module
            004 - No Signal/Communication - Intermittent
             Freeze Frame:
                    Fault Status: 00100100
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 44
                    Mileage: 217111 km
                    Time Indication: 0
                    Date: 2017.03.20
                    Time: 01:50:48

01304 - Radio
            004 - No Signal/Communication - Intermittent
             Freeze Frame:
                    Fault Status: 00100100
                    Fault Priority: 2
                    Fault Frequency: 2
                    Reset counter: 37
                    Mileage: 217037 km
                    Time Indication: 0
                    Date: 2017.03.15
                    Time: 00:02:02

01207 - Control Module for Auxiliary Heater (J364)
            004 - No Signal/Communication - Intermittent
             Freeze Frame:
                    Fault Status: 00100100
                    Fault Priority: 2
                    Fault Frequency: 3
                    Reset counter: 28
                    Time Indication: 0


-------------------------------------------------------------------------------
Address 25: Immobilizer (J334)       Labels:| 5K0-920-xxx-25.clb
   Part No SW: 5K0 953 234     HW: 5K0 953 234
   Component: IMMO          H04 0305
   Serial number:             
   Coding: 000000
   Shop #: WSC 00000 000 00000
   ASAM Dataset: EV_Immo_UDS_VDD_RM09 A03009
   ROD: EV_Immo_UDS_VDD_RM09_VW21.rod
   VCID: 6ADB13678D35CDDDFD-803E

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio
Cannot be reached

End-------------------------(Elapsed Time: 03:10)--------------------------
https://ibb.co/BZbSh7S
 
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   #2  

JMR

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you have errors complaining about ECU losing comms and it seems to me that your engine ECU drops comms from your scan ...is this scan fresh after you ve tired to clear all errors ? Or are those errors persistent and will come on again after clearing them ? There could be a loss of power from battery or your ecu loses it s power sometimes. Does the dash lights all up when power gone? Or it shows only the abs and airbag ?
 
   #3  

JMR

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ust to let you all know I would like to offer reward of £50 (bank transfer or PayPal ) to the person who will help me solve this nightmare
no rewards for opinions/help/suggestions necessary here , unless we do work on the car
 
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   #4  

ghosthd80

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Hi JMR
thanks for reply to my post
there was only one communication error and never come back
ECU don`t loose the power
ECU still calling for power
there is no lights on dashboard at all not even when power drops down
power dropping down then coming back up to around 2k rpm (its not fix RPM )
I change fuel filter after that power comeback for 5 min after that loosing power all the time
then I tested flow on pump 1.2l per min after that power comeback for another 10-15 min and back to square one
that`s interesting why there is no fault code on ECU

thanks
 
   #5  

PetrolDave

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THere are many intermittent no communication faults on many modules, have you checked basics like security of battery terminals and ground strap, security of wiring to fuse block, etc?
 
   #6  

ghosthd80

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I checked wiring battery terminals as well
and actually I add ground points to eliminate that problem
 
   #7  

JMR

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Is it possible that your alternator doesn t charge right all the time ? Can you rig a multimeter and take a ride monitoring the alternator voltage output ? Or you can do it with the vcds..
 
   #8  

ghosthd80

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All check alternator holding steady 13.8v
 
   #9  

S4Phil

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Although this thread is from 2022, we had a VW Transporter with the CAAA 2.0 TDI Engine with an almost identical fault as the OP's description and I thought I'd update the thread for any future searchers.

I messaged Sly (Thanks Sly!) the original poster and asked for his help, he advised the issue for them had ended up being the fuel return pipe set, part number 03L 130 235 AJ.

Our issue was also with the fuel return pipes (leak off pipe set), but the garage the vehicle came from had previously broken the black one way valve on the fuel return pipes & replaced it with a straight screen wash fitting. This part had been hidden by the factory heat protective sleeving on the return pipes.

This fault was a tough one due to all data logging on VCDS (fuel pressures, charge system, timing etc) coming back as perfect. Not only this but the van would only fault at a higher throttle input, it otherwise idled and took small amounts of throttle with no issues. After speaking with Sly and removing the leak off pipes from the vehicle, the foreign part was pretty obvious. The VW workshop manual states this valve being missing or faulty can be 'detrimental' to injector operation.

Hope this helps someone in the future!

 
   #10  

thebrick

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Although this thread is from 2022, we had a VW Transporter with the CAAA 2.0 TDI Engine with an almost identical fault as the OP's description and I thought I'd update the thread for any future searchers.

I messaged Sly (Thanks Sly!) the original poster and asked for his help, he advised the issue for them had ended up being the fuel return pipe set, part number 03L 130 235 AJ.

Our issue was also with the fuel return pipes (leak off pipe set), but the garage the vehicle came from had previously broken the black one way valve on the fuel return pipes & replaced it with a straight screen wash fitting. This part had been hidden by the factory heat protective sleeving on the return pipes.

This fault was a tough one due to all data logging on VCDS (fuel pressures, charge system, timing etc) coming back as perfect. Not only this but the van would only fault at a higher throttle input, it otherwise idled and took small amounts of throttle with no issues. After speaking with Sly and removing the leak off pipes from the vehicle, the foreign part was pretty obvious. The VW workshop manual states this valve being missing or faulty can be 'detrimental' to injector operation.

Hope this helps someone in the future!

THANK YOU SIR!!!!

This helped me, thanks alot!

I created an account here just to let you know that your post helped me solve this exact same problem, again thank you!
 
   #11  

S4Phil

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THANK YOU SIR!!!!

This helped me, thanks alot!

I created an account here just to let you know that your post helped me solve this exact same problem, again thank you!
That's great, hopefully I saved you weeks of headaches like we had!

Phil
 
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