Ok, I have finally been able to pull code info from this beast, and I am somewhat confused.

Firstly the codes:

Electronic Vehicle Information Center
Sensor Faults - Brake Fluid Switch Circuit Open (This one seems rather self explanatory. The stupid unneeded level sensor has died, and now I have a light and code telling me to spend money for some designer's faffing about.)

ABS module:
Anti-Lock Brake System
29FE - Wheel Speed LR Input Signal Missing
31FE - Wheel Speed RR Input Signal Missing
3EFE - Battery Pack Voltage Out of Range (WTF?)
21FE - Wheel Speed RF Input Signal Missing
19FE - Wheel Speed LF Input Signal Missing
Body Control Module
Vehicle Speed Fault - Fault Detected

So... Thoughts? What needs to be worked on, in the ABS system or computer to fix these codes? The 'battery pack' one has been there for a while AFAIK.

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Over 225 CRDs currently driving with my valves, timing belt, rockers, or ARP Studs.
Bad noises = REALLY bad things.

If it was me I would start with checking the battery and the electrical charging circuit (ALternator output). You can get all sort of strange sensor codes when the voltage levels drop.