C101500 - C101500 Two or More Monitoring Module IDs Duplicate Registered

C101500 Fault Deep Definition

C101500 is a critical fault code used in vehicle network systems for diagnosing the communication architecture of the Tire Pressure Monitoring System (TPMS), full name "Two or more monitoring module IDs registered duplicate". In vehicle bus communication or radio frequency identification networks, this fault code indicates that the system has detected an identifier (ID) conflict within a single physical network node. As the core control unit of the TPMS system, it is responsible for managing identity authentication and data distribution logic for multiple wireless sensor nodes. When unexpected ID duplicate registration phenomena are detected during system initialization or wheel pressure information synchronization tasks, it signifies that the diagnostic storage area recording has been triggered. This definition clarifies the code's role position in the vehicle electronic electrical architecture (E/E), belonging to the body control module monitoring results of sensor network topology consistency.

Common Fault Symptoms

When C101500 fault code is activated and stored in the control unit, drivers can confirm system status anomalies through the following perceptible phenomena:

• The instrument panel display area shows the Tire Pressure Monitoring System warning light continuously on or flashing alarm;
• The vehicle information system cannot read pressure values for each wheel position completely, or some data fields display as "--" or invalid values;
• Partial functionality of the tire pressure monitoring module is disabled, causing the system unable to update or store the latest pressure measurement information in real-time;
• In vehicle self-check mode, the TPMS may fail to complete learning program initialization confirmation.

Core Fault Cause Analysis

According to existing diagnostic data, the core triggers of this fault focus mainly on the control unit and its logic operation capabilities, specifically parsed from the following three dimensions:

• Hardware Components: Physical damage to internal storage chip or RF module of TPMS controller causes it unable to correctly write unique identifiers when sending data packets; or abnormal nodes in sensor network duplicate configured the same hardware ID.
• Wiring/Connectors: Connection between control unit and main vehicle communication bus (such as CAN bus) has intermittent short circuit or poor grounding, causing ID registration signals to be interfered during transmission, misjudged by controller as duplicate IDs.
• Controller Logic Operation: Fault occurs in TPMS controller internal software logic, occurring mistaken judgment when parsing external sensor registered ID sequences, incorrectly marking valid different modules as duplicate registration status; or controller firmware version has known defects, unable to handle concurrent registration requests correctly.

Technical Monitoring and Trigger Logic

System judgment for C101500 relies on strict internal algorithm and communication protocol validation process, specific trigger mechanism follows:

• Monitoring Target: System mainly monitors uniqueness of sensor ID and validity of bus communication handshake signals. When module enters standby or activation state, control unit checks reported identity identifiers.
• Numerical Range & Thresholds: Although this fault does not directly involve analog voltage thresholds, its trigger is based on digital logic signal boolean value judgment. When received ID quantity $N$ (successful registration count) does not match actual expected physical node quantity, and repeated elements are detected in ID set, system judges as abnormal.
• Specific Conditions: This fault usually triggered during vehicle ignition start self-check phase, or during executing "TPMS Sensor Learning" mode. Monitoring logic captures dynamic modulation when drive motor drives wheel rotation to produce signals (for active or passive sensing signals), once $ID_{i} = ID_{j}$ （其中 $i \neq j$）is captured within registration cycle, control unit immediately terminates normal process and stores fault code C101500.