2014 D4 in Limp Mode

[Bradmc]

Hi Guy's,

Hoping to get some advice to ease my anxiety.

I have a 2014 SDV6 that is currently in Engine Limp Mode. The issue started a week ago with error codes U0001 & U0100. Scanned by a NRMA service rep.

The car was taken to Land Rover for repair and the issue highlighted by the service department was a faulty Engine fuse.

The car was subsequently driven approximately 60kms without any issue, but today the car went back into Limp Mode. No camping this holiday period.

I have a number of accessories on the car and was wondering if there is a history with any of those that i have fitted that may be causing the engine issue.

Note: The accessories have been on the car for over 8 months with no issues.

I have fitted to the car:

Dual Battery (yellow top) with Redarc charger (solar);
Warn Winch
Snorkel
Spot Lights - all fitted by a reputable dealer.

Could the Dual Battery setup cause an issue? Or is there something else that may potentially be causing the issue e.g. faulty ECU etc.

I am worried this could be one of those ongoing issues that never seem to get sorted. I live in Sydney, and the car will be taken back to a local LR Service next week.

I just hope they have the skills to sort it.

[LandyAndy]

With your dual battery system,how is it connected to the main battery????
Andrew

[Bradmc]

Hi Andrew,

I am not a real technical guy. The system was installed by my local ARB centre, so i presume they know what they are doing.

I guess my concern is if the Redarc charger was at fault could that cause the issue.

Both batteries are in good condition and have been load tested, so kinda ruling out a low battery problem.

[Eevo]

The system was installed by my local ARB centre, so i presume they know what they are doing.

lol.
sorry, i found this funny.

[LandyAndy]

Hi Andrew,

I am not a real technical guy. The system was installed by my local ARB centre, so i presume they know what they are doing.

I guess my concern is if the Redarc charger was at fault could that cause the issue.

Both batteries are in good condition and have been load tested, so kinda ruling out a low battery problem.

Have a look.Its quite important.NO auxilary wiring at all can be connected to the negative terminal of the main battery on these vehicles.It must be done via earthing studs,there are spares next to the main battery for this.
ARB are not likely to know that
Andrew

[Pedro_The_Swift]

If the redarc has been fitted for 8 months,,
I doubt its the problem,,
Tomorrow may bring more help---

and
Thanks for your help Eevo

[Bradmc]

Thanks Andrew,

I will look in the morning. The system has been on the car for approx. 8 months and has been working fine though. I have run a fridge and other accessories off the secondary battery in that time.

I would think if it was wired incorrect, the fault may have come up when installed?? Again, I'm not technical so........

[Pedro_The_Swift]

Obviously googleing the errors is no help?

[LandyAndy]

Brad,there are a few on here very clued up on the electronics of these vehicles,as Pedro says,they should be along tommorow.
I just had a google,one of those codes relates to the can bus system,ie the nerves of the vehicle where all the messages are sent,the other loosing contact with the engine ECU.
It may well be something simple,the brake light switch can be an issue which can cause alot of strife.
Any other info you have may help,like has the engine been washed lately,driven in water or mud etc.
GOODLUCK
Andrew

[SBD4]

U0001-88

• High Speed CAN Communication Bus - Bus off
• Bus off
• Refer to the electrical circuit diagrams and check the power and ground connections to the module. Using the manufacturer approved diagnostic system, complete a CAN network integrity test. Refer to the electrical circuit diagrams and check the CAN network

U0100-00

• Lost Communication With ECM/PCM "A" No sub type information
• No sub type information
• Refer to the electrical circuit diagrams and check the power and ground connections to the module. Using the manufacturer approved diagnostic system, complete a CAN network integrity test. Refer to the electrical circuit diagrams and check the CAN network between the engine control module and traction control module

Likely to be an intermittent earth issue. As Andrew has said check that they have installed the DBS correctly and not earthed directly to the -ve terminal of the battery. Also, if the have been pulling cables around in that part of the car (behind the battery) it may be possible that they have put some strain on the harness for the ECM that may be failing only now.

Does limp mode reset after you switch the car off for a short period?