RS5 Juddering, Rough start when cold, Bad camshaft sensor

18 July Update: To answer your question first, Ape, yes, I did use OEM camshaft sensor.
So the jerking increased. I decided to take it to an Audi certified mechanic, and provided the entire history of the car. While at the shop, bank2 camshaft sensor threw an error code, and replaced both variable valve solenoids P/N 06E109257P. They did a transmission adaptation, and checked both lower intake flaps and were not stuck. I got the car back late afternoon 15 July. The shop said the jerking is still there but much better and softer. So drove it 16 July back and forth to work, and true the jerking became much softer but it increased in numbers. The car was jerking on every stop and go while before it was hard on cold start, and random when it was warmed. I used to have the transmission mode on auto and when I switched to comfort after this repair on 16 July the car behaved much better and it went back to jerk softly on cold start and random when it warmed up. On the way back from work yesterday 17 July TPMS light came on, followed by transmission light limited drivability, and then followed by CEL. Ran VCSD scan and here are the codes:

  • 10541 - Camshaft Adj. Bank 2 Intake
  • 4113 - Camshaft Position Sensor (G40)
    -10577 - MIL Request Signal Active (Check TCM for errors too!)
  • 8955 - Valve 3 in Transmission Part 1
    P17D4 00 [11101101] - Mechanical Malfunction
    MIL ON - Confirmed - Tested Since Memory Clear
  • 01315 - Transmission Control Module
    013 - Check DTC Memory - Intermittent

Is this a mechatronic issue?

Appreciate any input.

yes, positively. TPMS comes on then it can disappear temporarily when errors are cleared at audi and the adaptation will temporarily help it a bit. the mechatrinic probably always has to be replaced on a 2013.

Sry, before, I mixed up the camshaft solenoids with the sensors not remembering they are separate. Brand new solenoids can advance a bit more but they dont seem prone to become defective or fail and they throw sensor codes at low oil and maybe low pressure and battery as mentioned if at start up. for that the full scan would be needed

Thank you, TontoLoidRS5, below is the full scan.
Wednesday,17,July,2024,19:47:57:41809
VCDS – Windows Based VAG/VAS Emulator Running on Windows 11 x64
VCDS Version: 24.5.0.0 (x64) HEX-V2 CB: 0.4643.4
Data version: 20240429 DS355.0

VIN: WUAC6AFRXXXXXXXXX

Chassis Type: FR-AU48 (8R0)
Scan: 01 02 03 05 06 08 09 13 15 16 17 19 1B 22 36 3C 42 44 46 47
52 53 56 5F 6C

VIN: WUAC6AFR1DA902022 Mileage: 149700km-93019miles

01-Engine – Status: Malfunction 0010
02-Auto Trans – Status: Malfunction 0010
03-ABS Brakes – Status: Malfunction 0010
04-Steering Angle – Status: OK 0000
05-Acc/Start Auth. – Status: OK 0000
06-Seat Mem. Pass – Status: OK 0000
08-Auto HVAC – Status: OK 0000
09-Cent. Elect. – Status: OK 0000
13-Auto Dist. Reg – Status: OK 0000
15-Airbags – Status: OK 0000
16-Steering wheel – Status: OK 0000
17-Instruments – Status: OK 0000
19-CAN Gateway – Status: OK 0000
1B-Active Steering – Status: OK 0000
22-AWD – Status: OK 0000
36-Seat Mem. Drvr – Status: OK 0000
3C-Lane Change – Status: OK 0000
42-Door Elect, Driver – Status: OK 0000
44-Steering Assist – Status: OK 0000
46-Central Conv. – Status: Malfunction 0010
47-Sound System – Status: OK 0000
52-Door Elect, Pass. – Status: OK 0000
53-Parking Brake – Status: OK 0000
56-Radio – Status: OK 0000
5F-Information Electr. – Status: OK 0000
6C-Back-up Cam. – Status: OK 0000

Address 01: Engine (------CFSA) Labels:. 079-907-560-CFS2.clb
Part No SW: 8T2 907 560 B HW: 8T1 907 560
Component: 4.2l V8HDZ / H04 0002
Revision: NAH04— CVN: FFC6BBB8
Coding: 1A25003225C6080D3000
Shop #: WSC 06208 000 00000
ASAM Dataset: EV_ECM42FSI0118T2907560B 001003
ROD: EV_ECM42FSI0118T2907560B.rod
VCID: 3B232021A3EF95C2421-806E
VINID: 9E54531915A205444900200208D4C548E1

3 Faults Found:
10541 - Camshaft Adj. Bank 2 Intake
P052C 00 [01100100] - Cold-Start Timing not Reached
Intermittent - Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 2
Fault Frequency: 1
Mileage: 149630 km
Date: 2024.07.17
Time: 16:18:27

                Engine RPM: 1421.50 /min
                Normed load value: 43.9 %
                Vehicle speed: 0 km/h
                Coolant temperature: 42 °C
                Intake air temperature: 43 °C
                Ambient air pressure: 990 mbar
                Voltage terminal 30: 13.805 V
                Unlearning counter according OBD: 40
                CAN status - engine control module-Bits 0-7: 00000000 
                CAN status - transmission control module-Bits 0-7: 00000000 
                CAN status - brake control module 1-Bits 0-7: 00000000 
                CAN status - brake control module 2-Bits 0-7: 00000000 
                selected gear-Bits 0-7: 00000000 
                Cruise control switch actuation-Bits 0-7: 00000000 
                Cruise control switch actuation-Bits 0-7: 00000000 

4113 - Camshaft Position Sensor (G40)
P0341 00 [01100000] - Implausible Signal
Intermittent - Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 2
Fault Frequency: 1
Mileage: 149560 km
Date: 2024.07.16
Time: 16:18:04

                Engine RPM: 1921.00 /min
                Normed load value: 29.4 %
                Vehicle speed: 0 km/h
                Coolant temperature: 39 °C
                Intake air temperature: 38 °C
                Ambient air pressure: 990 mbar
                Voltage terminal 30: 12.675 V
                Unlearning counter according OBD: 37
                CAN status - engine control module-Bits 0-7: 00000000 
                CAN status - transmission control module-Bits 0-7: 00000000 
                CAN status - brake control module 1-Bits 0-7: 00000000 
                CAN status - brake control module 2-Bits 0-7: 00000000 
                selected gear-Bits 0-7: 00000000 
                Cruise control switch actuation-Bits 0-7: 00000000 
                Cruise control switch actuation-Bits 0-7: 00000000 

10577 - MIL Request Signal Active (Check TCM for errors too!)
P1624 00 [00100111] - -
Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 6
Fault Frequency: 1
Mileage: 149696 km
Date: 2024.07.17
Time: 19:26:42

                Engine RPM: 697.50 /min
                Normed load value: 22.4 %
                Vehicle speed: 0 km/h
                Coolant temperature: 96 °C
                Intake air temperature: 55 °C
                Ambient air pressure: 990 mbar
                Voltage terminal 30: 13.853 V
                Unlearning counter according OBD: 40
                AFS dm: 18.4 kg/h
                Mean injection time: 1.032 ms
                Engine operating condition-Channel 87: Idle
                Relative load value: 16.48 %
                Tumg: 28.5 °C
                Psr w: 369.92 hPa
                Engine torque: 74.0 Nm

Readiness: 0000 0000


Address 02: Auto Trans (J217) Labels:| 0B5-927-156.clb
Part No SW: 8T0 927 156 F HW: 0B5 927 156 J
Component: 0B5 42 FSINAR H01 0007
Revision: --H01— CVN: 0000BE48
Coding: 000001
Shop #: WSC 06325 000 00000
ASAM Dataset: EV_TCMDL501021 001012
ROD: EV_TCMDL501021.rod
VCID: 40D957CDCA09F61A173-8014

1 Fault Found:
8955 - Valve 3 in Transmission Part 1
P17D4 00 [11101101] - Mechanical Malfunction
MIL ON - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 2
Fault Frequency: 2
Reset counter: 40
Mileage: 149696 km
Date: 2024.07.17
Time: 19:21:50

                Engine RPM: 696 /min
                Transmission input speed: 696 /min
                Transmission output speed: 0 /min
                Engine torque: 8 Nm
                ATF temperature: 73 °C
                Accelerator pedal position: 0.0 %
                Clutch status: Beide Kupplungen offen

Address 03: ABS Brakes (J104) Labels:. 8K0-907-379-V1.clb
Part No SW: 8T0 907 379 F HW: 8T0 907 379 F
Component: ESP8 quattro H09 0100
Revision: -------- Serial number: --------------
Coding: 2C2D1A
Shop #: WSC 06325 000 00000
VCID: 45D746D9D5ABD332245-8010

2 Faults Found:
02214 - Tire Pressure Warning
000 - - - Intermittent
Freeze Frame:
Fault Status: 00100000
Fault Priority: 1
Fault Frequency: 1
Reset counter: 234
Mileage: 149303 km
Time Indication: 0
Date: 2024.07.15
Time: 15:25:22

         Freeze Frame:
                Hex Value: 0x4100
                Hex Value: 0x4006
                Hex Value: 0x1223
                Hex Value: 0x19AE
                Hex Value: 0x0000

01315 - Transmission Control Module
013 - Check DTC Memory - Intermittent
Freeze Frame:
Fault Status: 00101101
Fault Priority: 6
Fault Frequency: 2
Reset counter: 235
Mileage: 149696 km
Time Indication: 0
Date: 2024.07.17
Time: 19:21:50

         Freeze Frame:
                Hex Value: 0x00C0
                Hex Value: 0x4006
                Hex Value: 0x120E
                Hex Value: 0x23AF
                Hex Value: 0x0000

Address 05: Acc/Start Auth. (J393) Labels:. 8K0-907-064-05.clb
Part No SW: 8K0 907 064 GM HW: 8K0 907 064 FM
Component: BCM2 2.0 H12 0633
Revision: 00002001
Coding: 0D804000000000000000
Shop #: WSC 06325 000 00000
VCID: 015F92C981033F1258D-8054

Subsystem 1 - Part No SW: 8K0 905 852 E HW: 8K0 905 852 E
Component: J764 ELV MLB H40 0046
Serial number: 2312000270625011

No fault code found.


Address 06: Seat Mem. Pass (J521) Labels:. 8T0-959-760.clb
Part No SW: 8T0 959 760 E HW: 8T0 959 760 E
Component: MEM-BFS H10 0076
Revision: AA000000 Serial number: 00000046868234
Coding: 00037025002C00000000
Shop #: WSC 06325 000 00000
VCID: 45D746D9D5ABD332245-8010

No fault code found.


Address 08: Auto HVAC (J255) Labels:. 8Kx-820-043-3Z.clb
Part No SW: 8K1 820 043 T HW: 8K1 820 043 T
Component: KLIMA 3 ZONEN H04 0121
Revision: C1000000 Serial number: 01201220121013
Coding: 4802200000
Shop #: WSC 06325 000 00000
VCID: 392F3A29A953A7D250D-806C

No fault code found.


Address 09: Cent. Elect. (J519) Labels:. 8K0-907-063.clb
Part No SW: 8K0 907 063 DJ HW: 8K0 907 063 DJ
Component: BCM1 1.0 H16 0103
Revision: 09016001 Serial number: 00000528689901
Coding: 06000091043C9FF235004883000039090F9CD388A2090221000008004000010200040034000000
Shop #: WSC 06325 000 00000
VCID: 7AADE525ECD56CCA197-802E

Subsystem 1 - Part No SW: 8T1 955 119 D HW: 8J1 955 119 Labels: 1KX-955-119.CLB
Component: WWS 030113 H15 0080
Serial number: SWF13010035189
Coding: 00FD11

Subsystem 2 - Part No SW: 8U0 955 559 B HW: 8U0 955 559 B Labels: 8U0-955-559.CLB
Component: G397_RLFS H06 0002
Serial number: 20833809
Coding: 02005D

Subsystem 3 - Part No SW: 8K0 941 531 AQ HW: 8K0 941 531 AQ
Component: E1 - LDS H03 0031
Serial number: 00000000000412121171

Subsystem 4 - Part No SW: 4G0 907 410 A HW: 4H0 907 410 A
Component: USHL4.2 H30 0030
Serial number: 0000002274555R4B3Q02

Subsystem 5 - Part No SW: 8K5 941 329 HW: 8K5 941 329
H01 0031

Subsystem 6 - Part No SW: 8K5 941 329 HW: 8K5 941 329
H01 0031

Subsystem 7 - Part No SW: 4H0 907 658 HW: 4H0 907 658
Component: AQ_Hum_Sensor H03 0003
Serial number: CE39CE56000000000001

No fault code found.


Address 13: Auto Dist. Reg (J428) Labels: None
Part No SW: 8K0 907 561 C HW: 8K0 907 561 C
Component: ACC3 H11 0100
Serial number: 00000000000000
Coding: 00333E
Shop #: WSC 06325 000 00000
VCID: 323D0D057425548A917-8066

No fault code found.


Address 15: Airbags (J234) Labels:| 8K0-959-655.clb
Part No SW: 8K0 959 655 P HW: 8K0 959 655 P
Component: AirbagVW-AU10 H45 0610
Serial number: 003KJD917U5L Dataset Number: 8T0909602N 0004
Coding: 303343334830303030304A55304C38543053
Shop #: WSC 06325 000 00000
ASAM Dataset: EV_AirbaECUVWAUDI010 003010
ROD: EV_AirbaECUVWAUDI010_003_AU48.rod
VCID: 4ACD75E5FC353C4AC97-801E

Seat occupied recognition:
Subsystem 1 - Part No SW: 8K0 959 339 A HW: 8K0 959 339 A
Component: BF-Gewichtss. H02 0060
Serial number: 5810000R120000C0ST

Crash sensor for side airbag: driver side:
Serial number: 6334MSME7543530DD

Front Passenger’s Side Airbag Crash Sensor:
Serial number: 6344MSME754077318

Rear Side Airbag Crash Sensor (on driver’s side):
Serial number: 6352QSME7A282E7E+

Passenger side rear thorax airbag crash sensor:
Serial number: 6362QSME69260740C

Crash sensor for front airbag: driver side:
Serial number: 63732SME6626495E8

Crash sensor for front airbag: front passenger side:
Serial number: 63832SME66262148Z

No fault code found.


Address 16: Steering wheel (J527) Labels:. 8K0-953-568.clb
Part No SW: 8R0 953 568 S HW: 8R0 953 568 S
Component: Lenks.Modul H07 0171
Revision: 00000000 Serial number: 20121214000970
Coding: 00003E
Shop #: WSC 06325 000 00000
VCID: 51FF628911E30F9288D-8004

Component: E221 - MFL H03 0004

No fault code found.


Address 17: Instruments (J285) Labels:. 8T0-920-xxx-17.clb
Part No SW: 8T0 920 984 A HW: 8T0 920 984 A
Component: KOMBIINSTR. H35 0556
Revision: 00100000 Serial number: UVA26L2DD
Coding: 8BBF0100AF03D705020000
Shop #: WSC 06325 000 00000
VCID: 3D272E39BD7B9BF27C5-8068

No fault code found.


Address 19: CAN Gateway (J533) Labels:. 8T0-907-468.clb
Part No SW: 8R0 907 468 P HW: 8R0 907 468 D
Component: GW-BEM 5CAN-M H11 0055
Revision: 1Z100027 Serial number: 2741Z12C06027A
Coding: 80E3031600
Shop #: WSC 06325 000 00000
VCID: 4CC173FDF6C1227AFBB-8018

Subsystem 1 - Part No SW: 8T0 915 181 HW: 8T0 915 181
Component: J367-BDMHella H03 8041
Serial number: 9798408801

No fault code found.


Address 1B: Active Steering (J792) Labels: None
Part No SW: 8K0 907 144 J HW: 8K0 907 144 J
Component: DYNAMIKLENK. H06 0690
Revision: 52001005 Serial number: --------------
Coding: 030000
Shop #: WSC 06325 000 00000
VCID: 36353115984D48AABDF-8062

No fault code found.


Address 22: AWD (J492) Labels: 8K0-907-163.clb
Part No SW: 8K0 907 163 B HW: 8K0 907 163 A
Component: 4 Wheel Drive H13 0100
Serial number: 003011120001215 Dataset Number: 8T0909104C 0026
ASAM Dataset: EV_AllWheelDiffeQSPCAN 003019
ROD: EV_AllWheelDiffeQSPCAN.rod
VCID: 2F3B047167977962FE9-807A

No fault code found.


Address 36: Seat Mem. Drvr (J136) Labels:. 8T0-959-760.clb
Part No SW: 8T0 959 760 E HW: 8T0 959 760 E
Component: MEM-FS H10 0076
Revision: AA000000 Serial number: 00000046869104
Coding: 001B7B25002C00000000
Shop #: WSC 06325 000 00000
VCID: 45D746D9D5ABD332245-8010

No fault code found.


Address 3C: Lane Change (J769) Labels:| 5Q0-907-566.clb
Part No SW: 8T0 907 566 B HW: 8T0 907 566 B
Component: SWA Master H04 0060
Serial number: 0188345592 Dataset Number: 8T0909535G 0021
Coding: 010211
Shop #: WSC 06324 000 00000
ASAM Dataset: EV_LaneChangAssis 001020
ROD: EV_LaneChangAssis_AU21.rod
VCID: 3FDB5431B7F789E26E9-806A

Lane change assistance control module 2:
Subsystem 1 - Part No SW: 8T0 907 568 B HW: 8T0 907 568 B
Component: SWA Slave H04 0060
Serial number: 0188076022
Coding: 000102

No fault code found.


Address 42: Door Elect, Driver (J386) Labels:. 8K0-959-793.clb
Part No SW: 8T0 959 793 P HW: 8T0 959 793 G
Component: TSG FA H09 0304
Revision: -------- Serial number: --------------
Coding: 011C13224E00120102
Shop #: WSC 06325 000 00000
VCID: 56F59195380D68AA5DF-8002

No fault code found.


Address 44: Steering Assist (J500) Labels:| 8K0-909-144.clb
Part No SW: 8K0 909 144 F HW: 8K0 909 144 B
Component: RCEPS H37 0507
Revision: 00001000 Serial number: 0026001226 Dataset Number: 8T0909852H 0018
Coding: 010000010001
Shop #: WSC 06324 000 00000
ASAM Dataset: EV_RCEPSAU48X 008014
ROD: EV_RCEPSAU48X_008.rod
VCID: 34310B1D8EB15ABA83B-8060

No fault code found.


Address 46: Central Conv. (J393) Labels:. 8K0-907-064-46.clb
Part No SW: 8K0 907 064 GM HW: 8K0 907 064 FM
Component: BCM2 2.0 H12 0633
Revision: 00002001 Serial number: 0300029904
Coding: 0106029A00FAC00580B0003200000000
Shop #: WSC 06324 000 00000
VCID: 015F92C981033F1258D-8054

Subsystem 1 - Part No SW: 8K0 959 719 B HW: 8K0 959 719
Component: GTO BF H01 0080
Serial number: 00000000000000616251

Subsystem 2 - Part No: 1K0 951 605 C
Component: LIN BACKUP HO H05 1501

Subsystem 3 - Part No SW: 8R0 959 591 A HW: 8R0 959 591
Component: J245EE20SKB13 H04 0220
Serial number: 0123456789ABCDEFGHIJ

Subsystem 4 - Part No SW: 4G8 959 252 HW: 4G8 959 252
Component: HSP-SG H11 0028
Serial number: WA104542000002511627

3 Faults Found:
02615 - Fuel Tank Cap; Lock
009 - Open or Short to Ground - Intermittent
Freeze Frame:
Fault Status: 00101001
Fault Priority: 2
Fault Frequency: 2
Reset counter: 229
Mileage: 149241 km
Time Indication: 0
Date: 2024.07.10
Time: 15:35:59

02616 - Fuel Tank Cap; Unlock
009 - Open or Short to Ground
Freeze Frame:
Fault Status: 01101001
Fault Priority: 2
Fault Frequency: 4
Reset counter: 194
Mileage: 149241 km
Time Indication: 0
Date: 2024.07.10
Time: 15:36:54

01565 - Luggage Compartment Light (W3)
009 - Open or Short to Ground
Freeze Frame:
Fault Status: 01101001
Fault Priority: 2
Fault Frequency: 1
Reset counter: 187
Mileage: 149261 km
Time Indication: 0
Date: 2024.07.11
Time: 12:27:12


Address 47: Sound System (J525) Labels:. 8T0-035-223-BOM.clb
Part No SW: 8T1 035 223 A HW: 8T1 035 223 A
Component: DSP Prem H05 0030
Revision: 00005001 Serial number: 94813009151302
VCID: 2D071E796D1B0B72CC5-8078

No fault code found.


Address 52: Door Elect, Pass. (J387) Labels:. 8K0-959-792.clb
Part No SW: 8T0 959 792 P HW: 8T0 959 792 G
Component: TSG BF H09 0304
Revision: -------- Serial number: --------------
Coding: 011C13224E00120102
Shop #: WSC 06325 000 00000
VCID: 55F79699250B63B2545-8000

No fault code found.


Address 53: Parking Brake (----) Labels: 8K0-907-801-V2.clb
Part No SW: 8K0 907 801 L HW: 8K0 907 801 J
Component: EPB-4 H01 0003
Revision: -------- Serial number: 00000001229965
ASAM Dataset: EV_ParkiBrake 001027
ROD: EV_ParkiBrake_AU48.rod
VCID: 38293F2D92D9BEDAAF3-806C

No fault code found.


Address 56: Radio ® Labels:. 4F0-035-0xx-56.clb
Part No SW: 4G0 035 082 E HW: 4G0 035 082
Component: Radio U SIRIU H60 0121
Revision: AB001007 Serial number: 156LB0C7677492
Coding: 020007010000000001
Shop #: WSC 06325 000 00000
VCID: 221DFD4524C5C40A617-8076

No fault code found.


Address 5F: Information Electr. (J794) Labels:. 4E0-035-6xx-5F.clb
Part No SW: 8R1 035 746 C HW: 8R1 035 746 B
Component: H-BNT-NA H44 0624
Revision: -------- Serial number: 204L-0C7550094
Coding: 150200020306A9EF75028B4E00000403140000000000000000
Shop #: WSC 06325 000 00000
VCID: 372B3C119F47B1A2A69-8062

Subsystem 1 - Part No: 8R0 060 884 BA
Component: NAR 2013 0703

Subsystem 2 - Part No SW: 8R0 919 604 HW: 8R0 919 604
Component: DU7 High H41 0104
Serial number: A130LW0C2608741

Subsystem 3 - Part No SW: 8T0 919 611 L HW: 8T0 919 611 C
Component: E0380 Bedient H02 0030
Serial number: 00000001364482

Subsystem 4 - Part No: 8R0 060 961 E
Component: CD-Database 4949

No fault code found.


Address 6C: Back-up Cam. Labels: 8T0-907-441.clb
Part No SW: 8T0 907 441 C HW: 4L0 907 441 B
Component: J772__Rearview 0040
Revision: --H07— Serial number: 525PA8-J2X90E5
Coding: 1021008
Shop #: WSC 06325 000 00000
VCID: 38293F2D9E59BEDAAF3-806C

No fault code found.

End----------(Elapsed Time: 02:00, VBatt start/end: 12.3V/12.2V)-----------

I read that topic in full for the first time today, and You seem to have codes for misfires, and especially from camshaft sensors. Honestly at that point, I’d start with the pure basics, and check if the timing gear is in sync physically. For that you need to put the camshaft locking tools on, and the crankshaft locking pins, starting with the latter. If your timing is physically in sync, than you have these possible culprits:

  • Camshaft adjuster issue
  • Camshaft solenoids issue
  • Camshaft sensor issue
  • Faulty wiring
  • Faulty ECM

Also, I’d pull the plugs once more at this stage to see the color and possible differences between

The other things:

  • Check fuel trims (group 032 in VCDS) and post them here.
    As I personally have an S6, i don’t know if your engine has one or two ECMs. If you have two, you need to check these fuel trims in both.
  • Check for leaking injectors. For this you have to get your car up to running temp (based od VCDS reading, not the temp gauge, as it can show you the car is in running temp beginning at 70 *C), then shut the car off, put the ignition back on and read group 140 block 3. If your car has two ECMs, that group might be possible to read only in one of them. To check for leaky injector, you need to monitor the pressure in that block. It should rise quite quickly on hot engine. If it doesn’t change, or even starts dropping, one of your injectors is stuck open.

Wanted to update this post, the culprit of all the problems was to due to a bad mechatronic. Replaced the mech unit and car drives and shifts without the jumps. Fuel line trims and injectors checked out okay. The rough cold start is due to carbon build up. I still experience some not so smooth shift to 2nd gear but no more jumping or juddering on downshift and then upshift before coming to a full stop.