C101500 - C101500 Two or More Monitor Module IDs Duplicate Registration

Fault Code Definition

C101500 fault code represents a severe logical conflict occurring in the vehicle's internal communication network, with its core definition being "duplicate registration of two or more monitoring module IDs". In modern distributed electronic architectures, the Domain Controller (DC) serves as the master control node of the network, responsible for managing the identity identifiers of each subordinate module (Slave Modules) within its jurisdiction. This fault indicates that during initialization handshake or periodic polling, the Left Domain Controller detected that two or more different physical modules broadcasted the same unique identification code (ID). This ID duplication phenomenon directly damages the arbitration mechanism of the communication bus, causing data frame parsing conflicts, and subsequently leading to control instructions unable to be correctly routed to actuators. This fault is generally regarded as a signal that the network topology structure integrity is compromised, involving failure of unique identity verification for hardware nodes at the underlying protocol layer.

Common Fault Symptoms

Based on the diagnostic description that some functions of the Left Domain Controller have failed, vehicle owners and technicians can observe the following specific system manifestations:

• Instrument Warning Feedback: General communication fault indicator lights unrelated to powertrain or chassis may appear on the vehicle's information entertainment interface or instrument panel, indicating interruption of control logic.
• Specific Domain Function Degradation: Subsystems managed by the Left Domain Controller (such as specific body comfort functions or partial electrical loads) may exhibit sluggish response, loss of command execution, or intermittent sleep phenomena.
• Communication Bus Abnormality: Downstream connected modules may fail to receive effective configuration signals from the Left Domain, causing interruption of some body network services.
• System Self-Check Errors: The vehicle's self-diagnostic procedure (BOS) upon startup may repeatedly refresh this fault code and cannot be cleared through conventional resetting.

Core Fault Cause Analysis

Analyzing deeply from the perspective of automotive electronic architecture, the triggering mechanism of this fault code can be attributed to potential defects in the following three dimensions:

• Hardware Component Abnormalities: RF Controller Failure is one of the main suspects. Its internal identity storage unit or broadcast logic may suffer physical damage, leading to erroneous transmission of duplicate ID signals; simultaneously, failure of the Left Domain Controller itself as the master control node, such as internal processor logic errors or identity assignment table overflow, will also directly produce this determination.
• Wiring/Connector Defects: Harness or connector failures may cause severe electromagnetic interference (EMI) in the communication environment, causing signal distortion or crosstalk of ID data during transmission, resulting in the master control unit misjudging multiple different modules as a single source; additionally, poor grounding may also cause abnormal signal levels, affecting ID identification accuracy.
• Software Configuration Logic Errors: The firmware version of the network management unit may contain known vulnerabilities, or node registry updates may not be performed correctly after vehicle modification or battery reset, leading to duplicate virtual identities being written into the network registry pool.

Technical Monitoring and Trigger Logic

The generation of this technical fault code relies on the real-time diagnostic algorithm built into the Left Domain Controller, whose monitoring mechanism includes the following key steps:

• Monitoring Targets: The system continuously monitors ID request response frames (Response Frames) entering the network layer and the uniqueness status of broadcast identifiers.
• Judgment Threshold Logic: When the number of detected response ID conflicts within a monitoring window period exceeds the preset fault tolerance limit, the controller will lock this state. Since specific voltage/current values are not provided, the trigger condition is based on logical consistency verification at the communication protocol layer, i.e., any unexpected ID duplicate responses are considered out-of-limit.
• Trigger Conditions: Fault determination mainly occurs during the System Power-On Initialization Stage or Periodic Network Scanning Period. Once the Left Domain Controller captures an unexpected identical ID response sequence during bus idle polling (Polling), and transient interference is excluded, it will immediately set this fault code and turn on relevant indicator lights to indicate function failure.
• State Maintenance: As long as a unique ID matching relationship is not detected in the network topology, this fault condition will persist until the communication network returns to normal and no duplicate registration signals are output.