08 D3 Electronic Gremlins

[pedro54]

My 08 D3 has started having gremlins in the electronics, HDC FAULT, TRANSMISSION FAULT, SUSPENSION LOWERS, LIMP HOME MODE. Turn off ignition and restart, all fine for a while.

First time it occurred was in Toowoomba in traffic, August last year after a 3,500Km trip, 100k from home. Stopped and restarted, no further problems.

The fault reoccured in February and has been reoccuring on a number of occasions. on a number of occasions the fault has reoccured on the same stretch of road. I have been making notes on the faults before clearing with a Faultmate FCR.

So far I have replaced the Brakelight switch and cleaned the earth connections on the body as well as removing and cleaning the connectors on the Transfer Case Control Module. The faults are still occuring and the wife is getting vocal about the reliability of the vehicle.

Most appear to be commuications errors.

List of recurring faults

Air suspension

• U0416 invalid data received from vehicle dynamics control module - bus/signal message failure - signal is invalid - historic

Auto gearbox

• U2023 control module network signal calibration data - bus signal message failure.

HVAC

• B1B74
• B1B75
• B1B76
• B1B77

Instrument pack

• U0132 Lost comms with ride level control, los comms with suspension control module, message failure
• U0184 Lost comms with audio unit , bus signal message failure , missing message

Park brake 'a'

• U0100 Lost comms with engine control module/powertrain control module ' a' bus message failure intermittent

Terrain response

• U0401 invalid data received from engine control module/ powertrain control module , component failure unexpected operation
• U0402 invalid data received from transmission control module, component failure, unexpected operation
• U0416 invalid data received from vehicle dynamics control module, component failure, unexpected operation

I have also had the following ccode twice only, whereas the other have been regular.

Engine management

• P117d fuel volume regulator control exceeded max control limit, general failure information, no sub code information, intermittent

Need to know where to look next.

Peter

[DiscoJeffster]

BradC recently resolved a similar issue. After exhaustive diagnosis he ended up replacing the high pressure fuel pump (P117D error) and it resolved it. It’s becoming quite common and causes a cascading fault as you have experienced. There are a few things such as verifying the low pressure fuel pump and the fuel filter are ok first before embarking on a HPFP replacement however the odds favour the high pressure pump being the cause.

[BradC]

BradC recently resolved a similar issue. After exhaustive diagnosis he ended up replacing the high pressure fuel pump (P117D error) and it resolved it. It’s becoming quite common and causes a cascading fault as you have experienced. There are a few things such as verifying the low pressure fuel pump and the fuel filter are ok first before embarking on a HPFP replacement however the odds favour the high pressure pump being the cause.

In *my* case the HPFP faults always led to cascading park brake, suspension & transfer case faults (I don't have a transmission), but the others weren't present without one or more of the HPFP faults. Started as a P117D and gradually transitioned to the P0087 (low fuel pressure) over a matter of months.

I never saw audio, instrument pack or HVAC faults. Not to say that's conclusive as my car is a bit of a "special case".

If Peter has seen the Christmas tree of faults and only seen the HPFP faults twice I'd be more inclined to suspect something fundamental like the battery. These are tricky beasts.

[Eevo]

interesting my 08 RRS TDV8 has similar but opposite code


P117E-00 (2C) Fuel volume regulator control exceeded minimum control limit.


only happens in the first 30 seconds of driving.

[Graeme]

For all the comms faults I suggest that the transfer case module's connector pins and sockets be inspected for corrosion. The module is not sealed and the connectors are not waterproof and the module is a high speed can-bus gateway with the engine, gearbox and ABS ecus on 1 side and everything else including air suspension on the other side.

Also, check that the wiring harness behind the left front wheel hasn't come adrift and has rubbed on the inside of the tyre damaging wires.

[Ean Austral]

I had several of those codes on 2 occasions.

First was when i played around with fitting a extra battery in front of the start battery and i disturbed the 2 wires going to the earth studs. The list of faults surprised the hell out of me at the time.

Second was when i had a resonably new battery that had dropped a cell and after a week of checking ended up taking the battery for a load test out of sheer frustration , new battery fitted and all was good.

When my HPFP started to fault , the main fault that always showed was a low fuel rail pressure fault , then came the rest . That fault was constant thru every fault right up until the pump was changed and since changing there has been no issues.

Hope this helps.

Cheers Ean

[pedro54]

Thanks for the replies.

I had already cleaned the TCCM over the weekend and cleaned and retightened the earth connectors.

The P117D message has only appeared twice, out of about 10 failures, usually not there. The rest of the codes are consistent.

Was talking with Traxide earlier today about the SC80 and the fat the batteries had separated today. the comment was made after I discribed the typical weekly usage of the vehicle, I work from home and my wife is retired, that the battery could be suffering from sulphide buildup. It was recommended to change the battery for 12 hours a day over 5 to 7 days and see if the battery improves in storage the faults stop.

Trying that at the moment.

Peter

[loanrangie]

Thanks for the replies.

I had already cleaned the TCCM over the weekend and cleaned and retightened the earth connectors.

The P117D message has only appeared twice, out of about 10 failures, usually not there. The rest of the codes are consistent.

Was talking with Traxide earlier today about the SC80 and the fat the batteries had separated today. the comment was made after I discribed the typical weekly usage of the vehicle, I work from home and my wife is retired, that the battery could be suffering from sulphide buildup. It was recommended to change the battery for 12 hours a day over 5 to 7 days and see if the battery improves in storage the faults stop.

Trying that at the moment.

Peter

Did Tim suggest disconnecting the batteries to rule out a dead battery pulling down the other ? Last year i had an interesting incident where my main had dropped while i was tinkering with the earthing of my winch, left work only get the hdc/special progs off/suspension lowered just down the road. A restart didnt help so i limped back to work and although it seemed to start and run ok as soon as i tried to drive it would die. Made it down the down a few k's but in the end had to call the old man to bring me a battery. I removed my aux. i put the tiny battery from my mums nissan Tiida in and that was enough to get me back home.
Fixed my earth issue and charged the battery and no problems since.

[Crustie]

Hi
I had a similar problem and found when the Mechanic started to trouble shoot that under the carpet was flooded
caused by blocked condensation drains for the aircon. Since then we have cleaned out the drains and dried the
car carpets with heaters and dehumidifiers. The problems seemed to happen after a long runs with aircon on.
It is still early days since the repairs and remains to be seen if the problem is resolved however the problem has not
returned since the drying out
Cheers Chris

[PerthDisco]

Hi
I had a similar problem and found when the Mechanic started to trouble shoot that under the carpet was flooded
caused by blocked condensation drains for the aircon. Since then we have cleaned out the drains and dried the
car carpets with heaters and dehumidifiers. The problems seemed to happen after a long runs with aircon on.
It is still early days since the repairs and remains to be seen if the problem is resolved however the problem has not
returned since the drying out
Cheers Chris

Blocked sun roof drains perhaps? Have not heard of aircon drains blocking.