Member Since: 09 May 2021
Location: Hull
Posts: 40
On going problem - reversing issue
Don’t know if any of you are also on the fb page d3 d4 technical page, so apologies for the repeat question
I’ve changed :-
Rear
Discs
Pads
Callipers
Park brake shoes
Front
Pads
Callipers
All 4 wheel speed sensors
Brake servo
Vacuum pump & pipes
She’ll reverse the full length of the street solo, so I’ve just put my iFor Williams trailer on with about a quarter of ton of sand in and it’s gone into melt down system failure and ever fault known to man…….. what the hell can be next to replace ?????, got to get to the bottom of this problem sooner rather than later ! Any ideas
13th Jun 2021 12:54 pm
Dhaynes
Member Since: 09 May 2021
Location: Hull
Posts: 40
Just to add, I’ve taken trailer off ect….. reset any fault codes and even just starting it and selecting reverse makes it go into system failure no gears, HDC fault suspension fault you name it !
we've had a couple of recent posts where water in the towing electrics has been a factor, might be worth a look ?
edit : I typed as you added the 2nd part ... less sure now..
Dean
====================================
2011 D4 XS - OBD port protection, RLD spare wheel protector, All LED interiors lights, Timed Climate enabled, iiD tool paired.
2011 D4 Landmark - Stolen from same dealer before I paid for it
2011 D4 GS - Stolen whilst at dealer ... All LED interiors lights, DRLs, Spare Wheel protector.
1996 300Tdi - Eaten by tin worms
selecting reverse puts volts into rear light clusters so you may have the "duff brake light problem".
If a filament in the stop/taillight breaks and touches the other filament, the car detects volts on circuits it shouldn't and moans. could be triggered by reversing lights going live.
also check for water in the connections.
13th Jun 2021 1:02 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10355
Does it do it with the trailer electrics disconnected ?
Does the trailer have led indicators or brake lights
13th Jun 2021 1:04 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4616
And what were/are the codes you've cleared?yµ (idµ - eAµ) ψ=mψ
13th Jun 2021 1:08 pm
Dhaynes
Member Since: 09 May 2021
Location: Hull
Posts: 40
Trailer has LED lights and yes it does it without trailer attached
13th Jun 2021 1:09 pm
Dhaynes
Member Since: 09 May 2021
Location: Hull
Posts: 40
Fault codes all to do with system failure ect…
13th Jun 2021 1:15 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4616
Need to know what they are, otherwise it's just a long list of guesswork!yµ (idµ - eAµ) ψ=mψ
13th Jun 2021 1:19 pm
Dhaynes
Member Since: 09 May 2021
Location: Hull
Posts: 40
Off side rear light cluster half full of water !, that might not help maybe
13th Jun 2021 1:24 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4616
Off side rear light cluster half full of water !, that might not help maybe
And I was only expecting "moisture" to be the cause. .
Dean
====================================
2011 D4 XS - OBD port protection, RLD spare wheel protector, All LED interiors lights, Timed Climate enabled, iiD tool paired.
2011 D4 Landmark - Stolen from same dealer before I paid for it
2011 D4 GS - Stolen whilst at dealer ... All LED interiors lights, DRLs, Spare Wheel protector.
1996 300Tdi - Eaten by tin worms
13th Jun 2021 1:35 pm
Sea Raider
Member Since: 01 Nov 2016
Location: None
Posts: 4450
Dhaynes wrote:
Off side rear light cluster half full of water !, that might not help maybe
Look on the bright side, may be half empty
13th Jun 2021 1:39 pm
Dhaynes
Member Since: 09 May 2021
Location: Hull
Posts: 40
Just taken trailer for a trip down the street without the electrics plugged and yes you’ve guessed it ……. System failure, no special programs HDC fault 😡😡😡
13th Jun 2021 3:53 pm
Dhaynes
Member Since: 09 May 2021
Location: Hull
Posts: 40
It’s going into system failure every time I select reverse gear now
Fault codes as follows
Engine:- PO20A cylinder 1 injection timing
Gearbox :- U2023
ABS :- Uo401
Instrument pack :- Uo132
RideLevel control module :- Uo416
Heating & ventilation :- B1878
All terrain :- U0401
Parking control :- U0100
Vehicle dynamics :- U0401
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... All LED interiors lights, DRLs, Spare Wheel protector.
