Question about 2001 Cadillac DeVille

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I've got a 2001 Cadillac deville and it says it's lost the IRC ID and IRC data code. any idea how that happen?

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  • Jeff Armer Dec 08, 2016

    Radio quit working shows Code IRC U1000,
    Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. When a module receives a message for a critical operating parameter, the module records the identification number of the module which sent the message. These node alive messages are used for State of Health monitoring. A critical operating parameter is one which, when not received, requires that the module use a default value for that parameter. When a module does not associate an identification number with at least one critical parameter within 5 seconds of beginning serial data communication, DTC U1000 is set. When more than one critical parameter does not have an identification number associated with it, the DTC will only be reported once. The following modules communicate on the class 2 serial data circuit:

  • Jeff Armer Dec 08, 2016

    • Audio amplifier

    • Cellular telephone module w/UV8

    • Dash integration module (DIM)

    • Driver door module (DDM)

    • Driver door switch assembly (DDSA)

    • Electronic brake control module (EBCM)

    • Electronic suspension control module (ESC)

    • Front passenger door module (FPDM)

    • Inflatable restraint sensing and diagnostic module (SDM)

    • Instrument panel cluster (IPC)

    • Instrument panel integration module (IPM)

    • HVAC control module - auxiliary

    • Left middle door module (LMDM) w/V4U

    • Left rear door module (LRDM)

    • Memory seat module (MSM) w/A45

    • Navigation data processor w/UY4

    • Navigation display head w/UY4

    • Powertrain control module (PCM)

    • Radio

    • Rear integration module (RIM)

    • Remote control door lock receiver (RCDLR)

    • Right middle door module (RMDM) w/V4U

    • Right rear door module (RRDM)

    • Steering column module w/N37

    • Theft deterrent control module

    • Window switch - passenger front w/armored car

    • Vehicle interface unit (VIU) w/UE1



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  • Cadillac Master
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When a malfunction such as an open fuse to a module occurs while modules are communicating, a DTC U1001-1254 Loss of 000 Communications is set current. When the modules stop communicating the current DTC U1001-1254 Loss of 000 Communications is cleared but the history DTC remains. When the modules begin to communicate again, the module with the open fuse will not be learned by the other modules so U1000 or U1255 is set current by the other modules. If the malfunction occurs when the modules are not communicating, only U1000 or U1255 is set. Radio quit working shows Code IRC U1000 please help

Posted on Dec 08, 2016


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SOURCE: how to replace the thermostat on 2001cadillac deville

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SOURCE: 2001 cadillac deville, overheats without loss of coolant

First, provided their are no visible coolant leaks and/or loss of coolant with no signs of leaks, I would thoroughly flush cooling system and replace coolant, then check and/or replace thermostat (you can place thermostat in boiling water to check for proper function), if you have tried these 2 steps and still are experiencing overheating you may need to replace your water pump which can be a tricky job if you're unfamiliar and try to do it yourself, however, I could walk you through it if necessary. Also visually check your radiator hoses for bulges, wear ,etc along with heater hoses etc. You may want to also check radiator fins to see if they are dirty/obstructed and clean if necessary. Let me know if I can assist you further and how it works out

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SOURCE: 2001 cadillac deville theft lock on after replaced battery help!

IF when you purchased your car you didn't set your own personal code you will have to take this to your local GM dealer and they can pull the code that is set at the factory and unlock your radio.THe proceedure for setting your own code then unlocking radio is in your owners manual.The dealership I worked for did this for free.

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SOURCE: my 2001 cadillac deville keeps giving me dtc code system to lean

Anytime I get a too lean DTC I first change the fuel filter if it hasn't been changed in awhile. You'd be surprised how many times this has helped.

Good Luck with it.


Posted on Oct 22, 2009

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The class 2 serial data line communicates information between the modules. Each module connected to the serial data line is assigned a recognition code, or address. This code is used in order to identify which modules are communicating. Modules communicate with each other by periodically sending state of health (SOH) messages. When the ignition switch is in RUN, each module that is communicating on the serial data line sends an SOH message every 2 seconds. This ensures that the system is operating properly. At key on, most modules must learns the initiation data from other modules on the serial data line. When a module requests initialization data from another module, and that request is not acknowledged after 5 seconds, the module stores class 2 initialization error DTC U1255.
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