18047-Accelerator Pedal Pos. Sensor 1/2 (G79/G185): Implausible Signal? ONLY IN RAIN?

[WonPointAteTea]

the car: 2005.5 B7S4 6-SPEED

I keep getting this code with VagCom after/during heavy rain:

DTC: 18047 - Accelerator Pedal Pos. Sensor 1/2 (G79/G185): Implausible Signal?

Pulled ECU out, box was dry, blew out connectors anyway, pulled apart and blew out the connectors under the ECU, no apparent evidence of any moisture.

Same Code followed with ESP and EPC lights (and the dreaded limp mode grrrr)

Eventually would go away after restarting the car a few times after sitting

1. Replaced pedal assembly with brand new unit.... problem returned

2. Replaced throttle body... problem returned (connector was clean and dry too)

3. received an error for both rear O2 sensors out of the blue, I disconnected both sensors (after having other cars where DBW and O2s could cause issues and effect eachother when there were wiring issues, so figured it was worth a shot)... problem returned

Living in a rainy climate this is a problem LOL. It only seems to do it when there is heavy rain. It MAY be pure coincidence but seems related. What should I do next oh wise B6/B7 Gurus? My brain hurts and I am feeling defeated after battling this for the past 2 months. Not to mention I couldn't overtake a Chevy Spark on the freeway tonight while in limp mode, and that just isn't ok LOL

[xhackerekx]

clear codes start u car with ecu box open and try move and press ecu connectors when check engine light show up u find problem , for fix this u only need pin extractor and new ecu connector :) ask me how I know this

[WonPointAteTea]

clear codes start u car with ecu box open and try move and press ecu connectors when check engine light show up u find problem , for fix this u only need pin extractor and new ecu connector :) ask me how I know this

Thank you for the reply, can you help me narrow down my hunt by telling me which connector or even which pin you had problems with?

[xhackerekx]

search for ecu pin out .

[willroc7]

search for ecu pin out .

Could you elaborate? I searched and couldn't find your issue. Thanks.

[willroc7]

Here is my thread detailing similar issues. The exact same, I believe. My car is JHM tuned. Is yours?

http://www.audizine.com/forum/showth...-Throttle-body

I've had minor successes by cleaning the throttle body, and cleaning the wiring harness at the throttle body, but the issue came back after weeks or months. Reconnecting the wiring harness on the throttle body always clears the error lights and removes the limp mode.

Most recently I had my local indy take a look at the wiring between the ECU and the throttle body. One wire had a slightly high resistance but nothing that should cause a fault. My ECU box/area was clean as a whistle and showed no signs of moisture either. Interestingly, since they did this over a month ago (removing ECU, checking connections, reconnecting everything), the issue has not come back. Fingers crossed it was just a loose connection somewhere around the ECU and it won't come back.

[wisconsinbrew]

Here is my thread detailing similar issues. The exact same, I believe. My car is JHM tuned. Is yours?

http://www.audizine.com/forum/showth...-Throttle-body

I've had minor successes by cleaning the throttle body, and cleaning the wiring harness at the throttle body, but the issue came back after weeks or months. Reconnecting the wiring harness on the throttle body always clears the error lights and removes the limp mode.

Most recently I had my local indy take a look at the wiring between the ECU and the throttle body. One wire had a slightly high resistance but nothing that should cause a fault. My ECU box/area was clean as a whistle and showed no signs of moisture either. Interestingly, since they did this over a month ago (removing ECU, checking connections, reconnecting everything), the issue has not come back. Fingers crossed it was just a loose connection somewhere around the ECU and it won't come back.

Sorry to revive an old thread but my daughter had a similar issue with an 04 A4 3.0 that generated a CEL EPC and went into limp mode about a month ago after a rainstorm. After stopping and restarting the car it ran normal. Codes pulled were for P2138 Accelerator Position Sensor (G79/G185). I performed a TBA with Vagcom and the car has performed uneventfully until today. Same scenario, car was exposed to heavy rain overnight, and this afternoon my daughter reported the CEL EPC lights came on and the Tiptronic transmission wouldn't shift into 3rd and 4th gear and she had to shift it manually. She said it wouldn't make it past 45 mph (limp mode?) I used Vagcom to check codes and none were pending so I had to run a full scan and came up with:


18047 - Accelerator Position Sensor 1/2 (G79/G185)
P1639 - 008 Implausible Signal Intermittent
01314 Engine Control Module 79-10 Intermittent

I took it for a test drive this afternoon, ran it hard and it performed normally, shifted as designed, no CEL.

Both the ECM & TCM are JHM tuned (mailed in). Also running the JHM catless downpipes.

Just curious to find out how if your vehicle has been running fine since your last post.

I'll try the following tomorrow:

Remove & clean MAF
Disconnect & clean TB
TBA with Vagcom
Remove ECM and TCM, clean connectors, reinstall

Any other suggestions?

Thanks~Mark

[willroc7]

Vehicle ran fine for months until I swapped the downpipes and it has returned as an intermittent issue. So I never really have been able to get to the bottom of it.

[kevinye77137]

I had the same problem before and it gets worst when it's damp outside. The problem is that the throttle body connector is not fully plugged or connected even though you make hear a click. Use zip ties and force the connectors more in by using one of coolant lines as leverage. Then wrap some tape around the connector to vapor proofing. This solved my problems and it's been a year now and no problem

[wisconsinbrew]

I had the same problem before and it gets worst when it's damp outside. The problem is that the throttle body connector is not fully plugged or connected even though you make hear a click. Use zip ties and force the connectors more in by using one of coolant lines as leverage. Then wrap some tape around the connector to vapor proofing. This solved my problems and it's been a year now and no problem

Thanks to both of you. So far I was able to disconnect battery, remove the ECM, disconnect ECM, spray the shit out of the pins/tabs with cleaner, reassemble (I didn't mess with the TCM), removed and sprayed the shit out of the MAF sensor with MAF cleaner, reinstalled. I'm not familiar with the TB on the 3.0 and will need to do a little research before tackling that this evening. Kevin, what did you use to clean the contacts for the TB connector? Did you use any die-electric grease when reconnecting the TB?
I appreciate the recommendation for zip ties and tape.

Mark

[kevinye77137]

Thanks to both of you. So far I was able to disconnect battery, remove the ECM, disconnect ECM, spray the shit out of the pins/tabs with cleaner, reassemble (I didn't mess with the TCM), removed and sprayed the shit out of the MAF sensor with MAF cleaner, reinstalled. I'm not familiar with the TB on the 3.0 and will need to do a little research before tackling that this evening. Kevin, what did you use to clean the contacts for the TB connector? Did you use any die-electric grease when reconnecting the TB?
I appreciate the recommendation for zip ties and tape.

Mark

I just used regular electrical clean spray and foil tape around the exposed wires. Yes de electrical would work too but I'm too cheap for that. Zip tie is my best friend

Sent from my SM-G920V using Audizine mobile app

[wisconsinbrew]

I found info for the 1.8 and 2.0 but not much for the 3.0 throttle body. I can see the throttle body on the firewall side of the engine behind the intake manifold but it looks like a real PITA to remove and clean and I'm not sure it would be worth it. As far as a wire connector, it appears there is a connector on a plate that sits on top of the TB, along with some vacume hoses. Appears to be just two wires feeding the connector. Is this the connector that you are removing, cleaning and zip tying? Or perhaps do you have a 1.8 or 2.0 which is a slightly different animal?

In any case, reconnected everything, ran the TB adaptation a couple times and then did a full scan:

Monday,17,October,2016,21:08:19:20196
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 8 x64
VCDS Version: 16.8.3.1 (x64)
Data version: 20161010 DS267.0
www.Ross-Tech.com



Chassis Type: 8E (8E - Audi A4/S4/RS4 B6/B7 (2001 > 2008))
Scan: 01 02 03 08 09 0F 11 15 16 17 18 25 36 37 45 46 55 56 57 65
67 69 75 76 77

VIN: Mileage: 148220km-92099miles
-------------------------------------------------------------------------------
Address 01: Engine Labels: 06C-909-559-ASN.lbl
Part No SW: 8E0 909 559 D HW: 8E0 909 059
Component: JHM* V3/9X G 0003
Coding: 0016751
Shop #: WSC 63251 000 00000
VCID: 3669D6F7420999F256-515A

No fault code found.
Readiness: 0110 1100

-------------------------------------------------------------------------------
Address 02: Auto Trans Labels: 01V-927-156.lbl
Part No: 8E0 927 156 Q
Component: JHM VS2 3.0l5V USA 1213
Coding: 0001002
Shop #: WSC 63251 000 00000
VCID: 3C7DC4DF7C2543A2A0-515A

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 8E0-614-517.lbl
Part No: 8E0 614 517 A
Component: ABS/ESP allrad 3429
Coding: 04497
Shop #: WSC 01234
VCID: 264906B7C2A9E972E6-5120

2 Faults Found:
01314 - Engine Control Module
79-10 - Please Check Fault Codes - Intermittent
01826 - Sensor for Steering Angle (G85); Supply Voltage Terminal 30
35-00 - -

-------------------------------------------------------------------------------
Address 08: Auto HVAC Labels: 8E0-820-043.lbl
Part No: 8E0 820 043 AD
Component: A4 Klimaautomat 1219
Coding: 00000
Shop #: WSC 63251
VCID: 63CF5FA3F11B5C5AC1-513C

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect. Labels: 8E0-907-279-8E2.lbl
Part No: 8E0 907 279 F
Component: int. Lastmodul USA 0517
Coding: 01013
Shop #: WSC 63251
VCID: 356BD1FB0F0F92EA5F-4B18

1 Fault Found:
02104 - Light Detection Sensor (G399)
29-10 - Short to Ground - Intermittent

-------------------------------------------------------------------------------
Address 15: Airbags Labels: 8E0-959-655-84.lbl
Part No: 8E0 959 655 C
Component: Airbag 8.4EP 3001
Coding: 0010607
Shop #: WSC 63251 000 00000
VCID: 3777DBF3450360FA4D-513C

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel Labels: 8E0-953-549.lbl
Part No: 8E0 953 549 N
Component: Lenksáulenmodul 0308
Coding: 02042
Shop #: WSC 63251
VCID: 3E79CED73A3951B28E-4B18

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments Labels: 8E0-920-9xx-8E2.lbl
Part No: 8E0 920 950 L
Component: KOMBI+WEGFAHRS. RB4 D36
Coding: 03200
Shop #: WSC 02609
VCID: 3261EAE7FE6185D27A-515A
WAUVT68E34A039937 AUZ6Z0C0188654

No fault code found.

-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr Labels: 8E0-959-760.lbl
Part No: 8E0 959 760
Component: Sitzmemory R2 F 0305
Coding: 00002
Shop #: WSC 63251
VCID: 71E325EB3BE7FECA43-4B00

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv. Labels: 8E0-959-433-MAX.lbl
Part No: 8E0 959 433 BB
Component: Komfortgerát T7B 1411
Coding: 12044
Shop #: WSC 63251
VCID: 72E12AE73EE1C5D2BA-4B18

Subsystem 1 - Part No: 8E1959801
Component: Tõrsteuer.FS BRM 0003

Subsystem 2 - Part No: 8E1959802E
Component: Tõrsteuer.BF BRM 0003

Subsystem 3 - Part No: 8E0959801A
Component: Tõrsteuer.HL BRM 0003

Subsystem 4 - Part No: 8E0959802A
Component: Tõrsteuer.HR BRM 0003

7 Faults Found:
00962 - Alarm via. Tilt Sensor
35-00 - -
01374 - Alarm triggered by Terminal 15
35-00 - -
01371 - Alarm triggered by Door Contact Switch; Driver's Side
35-00 - -
01574 - Alarm triggered by Door Contact Switch; Rear Right
35-00 - -
00955 - Key 1
35-00 - -
01561 - Rear left door
59-10 - Can't Unlock - Intermittent
01562 - Rear right door
59-10 - Can't Unlock - Intermittent

-------------------------------------------------------------------------------
Address 56: Radio Labels: 8E0-035-1xx-56.lbl
Part No: 8E0 035 195 H
Component: symphony II NP2 0260
Coding: 01005
Shop #: WSC 68096
VCID: 2C5DF49FDC45D32230-508E

2 Faults Found:
00878 - Connection to Speaker Front Left
36-10 - Open Circuit - Intermittent
00879 - Connection to Speaker Front Right
36-10 - Open Circuit - Intermittent

End-------------------------(Elapsed Time: 05:51)--------------------------

Good news is the Accelerator Position Sensor code cleared up. We will see how long that stays cleared.

Mark

[wisconsinbrew]

Update. Heavy rain overnight here and today the same codes for Accelerator Position Sensor 1/2 (G79/G185) returned when my daughter drove the car home today in limp mode on side streets. Not sure what to try next. The Ross suggestions for this code mentions the code could be triggered by O2 sensors and associated wiring, however, I am not seeing any codes for O2 sensors. I believe the JHM catless downpipes still have O2 sensors connected to them so perhaps I'll need to go over their wiring and connections?

I performed a few Throttle Body Adaptations with Vagcom this afternoon, took it for a test drive and it threw a CEL, EPC and went into limp mode within the first block.

Well, tomorrow I'll try the following:

1. Check O2 sensor connections and wiring.
2. Remove the ECU and take a deeper dive into the ECU housing and wiring connections at the bottom of the ECU plenum to see if there has been any water infiltration
3. Try to figure out how to use Vagcom to determine if the accelerator pedal sensors are faulty

Any other suggestions?

I'll try posting my most recent log later this evening. Thanks in advance for any assistance you can provide.

Mark

[wisconsinbrew]

Latest log:

Wednesday,26,October,2016,11:47:30:20196
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 16.8.3.1 (x64)
Data version: 20161010 DS267.0
www.Ross-Tech.com


VIN: WAUVT68E34A039937 License Plate: 04 A4 3.O OCT 26 2016
Mileage: 148700km-92397mi Repair Order:



--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Chassis Type: 8E (8E - Audi A4/S4/RS4 B6/B7 (2001 > 2008))
Scan: 01 02 03 08 09 0F 11 15 16 17 18 25 36 37 45 46 55 56 57 65
67 69 75 76 77

VIN: WAUVT68E34A039937 Mileage: 148700km-92397miles
-------------------------------------------------------------------------------
Address 01: Engine Labels: 06C-909-559-ASN.lbl
Part No SW: 8E0 909 559 D HW: 8E0 909 059
Component: JHM* V3/9X G 0003
Coding: 0016751
Shop #: WSC 63251 000 00000
VCID: 3669D6F7420999F256-515A

2 Faults Found:
18047 - Accelerator Position Sensor 1/2 (G79/G185)
P1639 - 008 - Implausible Signal - Intermittent
18047 - Accelerator Position Sensor 1/2 (G79/G185)
P1639 - 008 - Implausible Signal - Intermittent - MIL ON
Readiness: 0000 0000

-------------------------------------------------------------------------------
Address 02: Auto Trans Labels: 01V-927-156.lbl
Part No: 8E0 927 156 Q
Component: JHM VS2 3.0l5V USA 1213
Coding: 0001002
Shop #: WSC 63251 000 00000
VCID: 3C7DC4DF7C2543A2A0-515A

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 8E0-614-517.lbl
Part No: 8E0 614 517 A
Component: ABS/ESP allrad 3429
Coding: 04497
Shop #: WSC 01234
VCID: 264906B7C2A9E972E6-513C

2 Faults Found:
01314 - Engine Control Module
79-10 - Please Check Fault Codes - Intermittent
01826 - Sensor for Steering Angle (G85); Supply Voltage Terminal 30
35-10 - - - Intermittent

-------------------------------------------------------------------------------
Address 08: Auto HVAC Labels: 8E0-820-043.lbl
Part No: 8E0 820 043 AD
Component: A4 Klimaautomat 1219
Coding: 00000
Shop #: WSC 63251
VCID: 63CF5FA3F11B5C5AC1-513C

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect. Labels: 8E0-907-279-8E2.lbl
Part No: 8E0 907 279 F
Component: int. Lastmodul USA 0517
Coding: 01013
Shop #: WSC 63251
VCID: 356BD1FB0F0F92EA5F-4B18

1 Fault Found:
02104 - Light Detection Sensor (G399)
29-10 - Short to Ground - Intermittent

-------------------------------------------------------------------------------
Address 15: Airbags Labels: 8E0-959-655-84.lbl
Part No: 8E0 959 655 C
Component: Airbag 8.4EP 3001
Coding: 0010607
Shop #: WSC 63251 000 00000
VCID: 3777DBF3450360FA4D-513C

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel Labels: 8E0-953-549.lbl
Part No: 8E0 953 549 N
Component: Lenks·ulenmodul 0308
Coding: 02042
Shop #: WSC 63251
VCID: 3E79CED73A3951B28E-4B18

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments Labels: 8E0-920-9xx-8E2.lbl
Part No: 8E0 920 950 L
Component: KOMBI+WEGFAHRS. RB4 D36
Coding: 03200
Shop #: WSC 02609
VCID: 3261EAE7FE6185D27A-513C
WAUVT68E34A039937 AUZ6Z0C0188654

No fault code found.

-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr Labels: 8E0-959-760.lbl
Part No: 8E0 959 760
Component: Sitzmemory R2 F 0305
Coding: 00002
Shop #: WSC 63251
VCID: 71E325EB3BE7FECA43-4B00

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv. Labels: 8E0-959-433-MAX.lbl
Part No: 8E0 959 433 BB
Component: Komfortger·t T7B 1411
Coding: 12044
Shop #: WSC 63251
VCID: 72E12AE73EE1C5D2BA-4B00

Subsystem 1 - Part No: 8E1959801
Component: Tırsteuer.FS BRM 0003

Subsystem 2 - Part No: 8E1959802E
Component: Tırsteuer.BF BRM 0003

Subsystem 3 - Part No: 8E0959801A
Component: Tırsteuer.HL BRM 0003

Subsystem 4 - Part No: 8E0959802A
Component: Tırsteuer.HR BRM 0003

8 Faults Found:
00962 - Alarm via. Tilt Sensor
35-00 - -
01374 - Alarm triggered by Terminal 15
35-00 - -
01371 - Alarm triggered by Door Contact Switch; Driver's Side
35-00 - -
01574 - Alarm triggered by Door Contact Switch; Rear Right
35-00 - -
00955 - Key 1
35-10 - - - Intermittent
00956 - Key 2
35-00 - -
01561 - Rear left door
59-10 - Can't Unlock - Intermittent
01562 - Rear right door
59-10 - Can't Unlock - Intermittent

-------------------------------------------------------------------------------
Address 56: Radio Labels: 8E0-035-1xx-56.lbl
Part No: 8E0 035 195 H
Component: symphony II NP2 0260
Coding: 01005
Shop #: WSC 68096
VCID: 2C5DF49FDC45D32230-50AC

2 Faults Found:
00878 - Connection to Speaker Front Left
36-10 - Open Circuit - Intermittent
00879 - Connection to Speaker Front Right
36-10 - Open Circuit - Intermittent

End-------------------------(Elapsed Time: 05:53)--------------------------

[lskolnick]

Bump. I have the exact same issue. It shows up when its damp. I also have a rear O2 code.

[Pyromatic177]

Interesting, this is one of the codes that’s popping up with my RS4

Refer to my thread here: https://www.audizine.com/forum/showt...-highway-TWICE

It’s not when it’s wet but rather that code comes up with 2 others and my car quits with no start. Turns over but not ignition...

[lskolnick]

Water is getting into your ECU box at the back under the wiper and dripping on the white connector, or water has been in there previously and the pins are corroded.