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Limp mode p029900

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April 20, 20251 yr

Hi hi guys my went in limp mode today after resetting my transmission on my Audi a4 b8 tdi 2012 and started giving me this p029900 code but not check engine light any suggestions on what it could be.

Thanks in advance

Halldor

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Engine / ECU to Injector wiring loom
New Members Introductions

Engine / ECU to Injector wiring loom

Neil Robertson · 6 hours ago6 hr

Hi, I'm looking for a engine/injector wiring loom that goes from the ECU (8P0 907 115 T Med 9.1) to the injectors (06F906036A) for a Audi A3 2008 2.0L TFSI Quattro due to an intermittent misfire issue on cylinder no. 4. Cost from TPS for genuine replacement is astronomical, any help would be appreciated (e.g. where to source a replacement, correct part no., etc)
- 1 reply
- 36 views
Neil Robertson

6 hours ago6 hr

Neil Robertson

6 hours ago6 hr
Are S5's notorious for not being serviced?
New Members Introductions

Are S5's notorious for not being serviced?

ZeroX · Saturday at 10:46 AM5 days

Hi, following on from my previous thread, I have seen another car that I was interested in: https://www.evanshalshaw.com/search/details/used/audi/a5/automatic-petrol-white-coupe/06ce9494-f94d-f111-8fdd-000d3a874790/ When I enquired with the dealer, they said there is only one stamp in the book from February of this year, and no history at all in the Audi database. So there is only evidence of 1 service in almost 10 years. I am starting to get a bit !Removed! off with this actually, and it's real
- 25 replies
- 495 views
ZeroX

Saturday at 10:46 AM5 days

cliffcoggin

6 hours ago6 hr
New 226 audi q3
Audi Q3 Club

New 226 audi q3

james brown · January 20Jan 20

Any member bought one.
- 53 replies
- 3,218 views
james brown

January 20Jan 20

MartinInnes

6 hours ago6 hr
Running boards 2024 black petrol standard model
Audi Q5 Club

Running boards 2024 black petrol standard model

Peter aeddon · 7 hours ago7 hr

Hi I’ve just joined and I want running boards on my 2024 Q5 petrol standard. I live in Edinburgh does anyone know where I can go other than the main dealer as they are extremely expensive. I require them to supply and fit for a good price.
- 0 replies
- 23 views
Peter aeddon

7 hours ago7 hr

Peter aeddon

7 hours ago7 hr
C5 RS6 034 strut top mount
Audi A6 (C5) Forum

C5 RS6 034 strut top mount

petec5 · 19 hours ago19 hr

Hello all After a year of owning my first RS6 c5. It seems I'm in need of new strut top mounts. Do any of you have experience of the 034 rubber mounts? I've seen they are solid vs original ones that have bearings. How much of a difference does this make. And on a side note has anyone used RB Racing brake disc. What's your thoughts? Any help will be much appreciated Pete
- 4 replies
- 84 views
petec5

19 hours ago19 hr

petec5

8 hours ago8 hr
Help with some issues
Audi A5 Club

s5 coupe
Help with some issues

Kian · May 27May 27

Hello everyone, Wondering if anyone can help me. A few weeks ago my EPC light came on and immediately went into limp mode and started jumping when driving at 5mph. After a few hours I came back to the car and it was fine so I drove it to my storage unit. I came back the next day and when starting it the EPC light and EML light were illuminated and the idle was quite rough. I came back to it about a week ago and all the doors were locked, the key isn't unlocking it and the barrel of the central
- 5 replies
- 242 views
Kian

May 27May 27

cliffcoggin

10 hours ago10 hr
Wing mirrors don't fold out when unlocking the car.
Audi Q2 Club

Wing mirrors don't fold out when unlocking the car.

john260164 · 13 hours ago13 hr

Hi. My partner's recently bought Q2 has an odd and not very welcome feature. The wing mirrors fold on locking the car with the key pilp, but don't unfold when the car is unlocked with the plip. They only do so when the key goes in the ignition. In some circumstances this can lead to doubt about whether the doors are locked or not whereas before it was obvious as the plip alone folded and unfolded the wing mirrors (as is does with my similarly new A3). The garage says it can't be changed but does
- 2 replies
- 68 views
john260164

13 hours ago13 hr

john260164

11 hours ago11 hr
Park My A3 without having brakes on
Audi A3 (8Y) Forum

Park My A3 without having brakes on

JGB · 17 hours ago17 hr

Hi all I have had my A3 since September 2025 and I haven't yet been able to figure how to park it in my garage with the brakes off. It's an auto and I have read lots of stuff but I cannot figure it out. I may be stupid but there you go any helpful advice will be appreciated. JB
- 2 replies
- 88 views
JGB

17 hours ago17 hr

joe6

11 hours ago11 hr
A3 uncommanded engine shutdown
Audi Technical

A3 uncommanded engine shutdown

Bobs dad · 16 hours ago16 hr

I have a new A3 Black Edition auto. Within four weeks of delivery the engine cut out whilst driving, the drivetrain under positive power. The car rolled to a complete halt, the retardation entirely commensurate with the wheels driving a dead engine - it did not freewheel. The instrument panel remained powered and displayed no warning lights or fault messages. I shut the car down and after a pause restarted. Since then it has operated normally. The Distributor has found no data supporting t
- 1 reply
- 74 views
Bobs dad

16 hours ago16 hr

cliffcoggin

12 hours ago12 hr
Audi A1 coil packs
Audi A1 Club

Audi A1 coil packs

Andy baggy · May 21May 21

Recently while driving my EPC light came on . Followed by my engine management light. Unfortunately I was on the motorway so put car into sports mode in the auto box to keep the revs high so I could get home the 49 miles. Been to the garage this morning no lights on my dash they diagnosed 2 coil packs going down. They are going to replace all 4 spark plugs and coil packs next week. They also said that I may now need a new catalytic converter. Has anyone had any issues with this sort of proble
- 1 reply
- 190 views
Andy baggy

May 21May 21

Steve Q

12 hours ago12 hr
Central locking
Audi A3 (8P) Forum

Central locking

BlueBird · 19 hours ago19 hr

My passenger door only unlocks during summer months, back door same side, intermittent during winter. Is there an explanation please?
- 1 reply
- 60 views
BlueBird

19 hours ago19 hr

cliffcoggin

12 hours ago12 hr
GEARBOX MALFUNCTION YOU CAN CONTINUE DRIVING
Audi A6 (C7) Forum

GEARBOX MALFUNCTION YOU CAN CONTINUE DRIVING

Fcam_96 · Monday at 08:04 PM3 days

Hi, so I’ve had my audi a6 just over a year now cars been brilliant tbh drives perfect, on Saturday I did a 350 mile round trip to London and back in one day no issues at all that’s probably the longest drive I’ve done in the car, today I was driving back from work I got a message on my dash saying gearbox malfunction, I scanned the car and it gave me these three codes P084000 Transmission Fluid Pressure Sensor/Switch A P177500 Hydraulic pressure sensor 1 Adaptation at limit P060B00 Internal C
- 1 reply
- 118 views
Fcam_96

Monday at 08:04 PM3 days

Steve Q

12 hours ago12 hr
A% front suspension groan
Audi A5 Club

A% front suspension groan

IainH · 12 hours ago12 hr

Last summer while in the heat of southern France, my A5 (Dec-2017, 40,000 mile) developed a front suspension creak. It was always at low speed and particularly when turning left. The car was completely checked on my return, 'shaked, rattled and rolled', but steadfastly refused to creak once, however, everything was checked, levered, put in a shaking plate, and no creaks or movement in joints found, and so while noisy, the car was declared 'good' (safe). The sound is very like the creak heard her
- 1 reply
- 35 views
IainH

12 hours ago12 hr

spartacus 68

12 hours ago12 hr
Any ideas on what this sound could be? Audi A3 8P
Audi A3 (8P) Forum

Any ideas on what this sound could be? Audi A3 8P

Lewbyleww · 19 hours ago19 hr

Hi all does anyone have any idea on what this distinct tapping noise could be? had the rocker arms, lifters, injectors and all cam followers replaced and is still present. Noise is at idle and speeds up with acceleration and can hear it inside doesn't affect performance. Been advised by three separate mechanics its not bottom end so at my wits end really, any thoughts appreciated. Thanks a7bcf128-5947-4002-afba-29c811dd5d88 (1).mp4
- 0 replies
- 93 views
Lewbyleww

19 hours ago19 hr

Lewbyleww

19 hours ago19 hr
Does anyone know what this high pitched noise is?
Audi A1 Club

Does anyone know what this high pitched noise is?

redaudi20 · December 11, 2025Dec 11

IMG_2335.MOV Hi there, My A1 1.6 TDI Sport 2017 makes this high pitched noise which sounds like it’s coming from the right rear side. It more tends to happen when the weather is cold. It starts when the car has been going for a couple miles and stops as soon as you turn the engine off. I have attached a video of the noise. Does anyone know what this could be? Thanks IMG_2335.MOV
- 3 replies
- 710 views
redaudi20

December 11, 2025Dec 11

StanH

19 hours ago19 hr

Welcome to the Audi Owners' Club - An Independent community!

Limp mode p029900

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Topics

Engine / ECU to Injector wiring loom

Are S5's notorious for not being serviced?

New 226 audi q3

Running boards 2024 black petrol standard model

C5 RS6 034 strut top mount

Help with some issues

Wing mirrors don't fold out when unlocking the car.

Park My A3 without having brakes on

A3 uncommanded engine shutdown

Audi A1 coil packs

Central locking

GEARBOX MALFUNCTION YOU CAN CONTINUE DRIVING

A% front suspension groan

Any ideas on what this sound could be? Audi A3 8P

Does anyone know what this high pitched noise is?

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