U1041 Code I have been told it is a communication with auto alarm loss and I have it showing in the auto history when checked by computer. The alarm appears to be working, doors lock and unlock, alarm tones. My question is, should I be worried that it is still active and if so, how do i check.
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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
The only ones that are actually codes are the "U" codes. The other designation is a communication protocol.
Those codes are network communication codes and indicate there is a problem with modules communicating with each other. This is a highly technical diagnosis that you will not be equipped for.
Most common causes are bad spark plugs or emission monitors. You can check the cars computer codes for showing what codes have come up. Most auto parts stores will connect their computer to your cars port under the steering wheel and give you a print out of the code histories.
U codes pertain to the class 2 serial data network . A dead module ,a short on the network will bring down the network - no communications between modules = no start problems .
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 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 or U1255 DTC 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 class 2 serial data line on this vehicle is a star configuration. The following modules communicate on the class 2 serial data line:
• The body control module (BCM)
• The electronic brake control module (EBCM)
• The inflatable restraint sensing and diagnostic module (SDM)
• The instrument panel cluster (IPC)
• The powertrain control module (PCM)
• The radio
• The remote control door lock receiver (RCDLR)
• The vehicle communication interface module (VCIM)
Look's like a communication problem with the PCM & EBCM !
Powertrain Control Module (PCM)
Electronic Brake Control Module (EBCM)
• An intermittent open between a module and a star connector may cause this DTC to set.
• A poor connection at a module or a star connector may cause this DTC to set.
• An intermittent open in a star connector may cause this DTC to set.
• An open voltage or ground circuit to a module may cause this DTC to set.
• An internal module malfunction may cause this DTC to set.
U1064 - Loss of Communications with DIM (Dash Integration Module) Here is some TSB
Refer to Data Link Connector (DLC) Schematics
The class 2 serial data line communicates information between 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 communicating on the serial data line sends a SOH
message every 2 seconds. This ensures that the system is operating
properly. When the dash integration module (DIM) stops communicating on
the class 2 serial data line, the SOH that is normally sent on the
serial data line every 2 seconds disappears. The module, which expects
to receive that message, detects the absence of the message. The module
in turn sets DTC U1064 associated with the loss of SOH of the DIM.
Conditions for Setting the DTC
The module does not receive a state of health (SOH) message back from
the DIM. The module retries the request 3 times, and then sets DTC
This DTC only sets if U1300 or U1301 is not current.
Action Taken When the DTC Sets
DTC U1064 is stored in the module.
The module uses the default values for the initialization data. This DTC does not cause driver warning message to appear.
Conditions for Clearing the DTC
This DTC clears (status changes from current to history) under any of the following conditions:
The module detects a state of health message from the DIM.
At each ignition cycle.
A history DTC clears after 50 consecutive ignition cycles if the conditions for setting the DTC are no longer present.
Current and history DTCs may be cleared using a scan tool.
DTC U1064 does not normally represent a failure within the module.
When loss of class 2 serial data communication DTCs (DTCs with the
letter U as the prefix) are stored as history DTCs, know all possible
serial data DTCs set in each module before diagnosing the serial data
If U1064 is stored in the module memory, inspect for the same DTC stored in other modules capable of storing this DTC.
If the DTC is a history DTC, the problem may be intermittent.
Test Description: The numbers below refer to the step numbers on the diagnostic table:
U1064 is the result of loss of communication with the dash integration
module (DIM). Note that other modules on the class 2 serial data line
may also set U1064 if the DIM is not communicating with the serial data
Clear all DTCs after the repair procedure is complete.
Did you perform the Data Link Communications Diagnostic System Check?
Go to Step 2
Go to Diagnostic System Check - Data Link Communications
Use a scan tool in order to attempt the establish communication with the dash integration module (DIM).
Does the scan tool communicate with the DIM?
Go to Step 3
Go to Diagnostic System Check - Body Control System in Body Control System.
Inspect and repair the class 2 serial data line CKT 1807 (PPL) for
intermittent connections. Refer to Intermittents and Poor Connections
Diagnosis in Wiring Systems.
Is the repair complete?
Go to Step 4
Turn off the ignition switch.
Reconnect or install any connectors or components that were disconnected or removed.
Turn on the ignition switch.
Clear any DTCs.
Is the repair complete?
U1096 - Loss of Communications with IPC
The computers on the Chevy require a certain voltage to operate and if the
voltage drops below a preset limit then it will tripper a loss of
communication with the other modules, this drop in voltage happens when
the car is started and the draw on the starter uses a large amount of
amperage. I suggest to check power/ground in the instrument cluster and if good do a resistance test on Data wire.
If your car is not experincing any messages like "service vehicle soon"
and no warning lights are illuminating then disregard these codes.
Codes U1XXX (where XXX stands for several possible numerical digits, 001 - 254) are communications fault codes. The first part (U1) tells you that there is a communication problem with one of your many onboard control modules. The second part (XXX) or in your case, (041) tells you which module is not communicating. It can vary from year to year, model to model. so without knowing the year and model of the vehicle we are talking about, I cannot tell you which one.
In any case, there is a module that is not communicating with the other modules that are sharing information through the Class 2 serial data circuit. One module uses U-codes to tell on the other modules. For instance, If you got the U1041 code out of scanning the Engine Control Module, you can bet that the Engine Control Module is not having a problem communicating. If it was, you would get a non-communication fault from your scan equipment and the ECM would not tell you anything. Instead, the ECM is telling on the module that is not communicating properly .
I like to call these codes the 1-800 codes...THE PHONE LINE IS DOWN... lol ;)