I am not sure it means anything, these may be spurious codes thrown off by my CRDs electronic system but I want to check in case I am missing anything. I am running the ORM 'system', when I plug my OBD reader in I usually get the ever popular P0102 which does not concern me. But occasionally I get these weird codes: 0004 and 3A00. When I clear off the codes and reconnect the MAF nothing comes up. But its strange getting these odd codes, do they mean anything?

I get the exact same codes running the ORM. Do you have any other mods? Lift pump?

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05CRD: GDE Hot ECU & TCM tunes, Provent, Cat filter, Facet lift pump, TransGo kit, Florida TC, Samcos, stainless brake lines, HDS thermostat, Renegade light bar,
RL super sliders, Bilstein adjustables, Al's Gen 4.5 Arms, 235/85-16 Duratracs, DTT rear, Elocker front, EVIC+TPMS, Turbo timer, McNally pillar gauges, Weeks Stage II kit.

I sometimes get these codes right before the code reader clears the codes. I thought it was part of the process????

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2006 Black Jeep Liberty CRD Limited
K&N, Samco Hoses, Michelin 245/70-16 LTX A/T2, Fumoto F-102, V-Force Muffler, Mopar, Hitch, Trailer Wiring, Skid Plates, Slush Mats, Rear Shelf, Predator Stage 1, Transgo, ORM & CodeReader, Facet 40109 Pump
"IT'S A DIESEL THING, YOU WOULDN'T UNDERSTAND"
Certified Services Auto & Truck Repair

The 0004 could be a fuel management code, prolly resulting from ECM inability to match projected fuel rate values when MAF is connected and functional - prollem is, you don't get the Alpha code, such as Pxxxx, Bxxxx, Cxxxx, or Uxxxx to specify area - since that is a generic-code reader, it is prolly P0004, for fuel management

Each DTC can mean 20 different things, each of which is specific to oem specifications.

The 3A00 may be a function of the reader, as it is in 16bit Hex - 0011 1010 0000 0000 - DTC's are strictly decimal, 0000 to 4096 - that could be the clear\reset code, or checksum verification that the DTC sucessfully cleared

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'05 CRD Limited
Pricol EGT, Boost
GDE Hot '11; EDGE Trail switched
SEGR; Provent; Magnaflow;
Suncoast T\C, Transgo Tow'n'Go switch;
Cummins LP module, Fleetguard filter, Filterminder
2.5" Daystar f, OME r; Ranchos; K80767's, Al's lifted uppers
Rubicons, 2.55 Goodyears
Four in a row really makes it go