C100B00 - C100B00 Right Rear TPMS Module ID Not Registered

C100B00 Right Rear Tire Pressure Monitoring Module ID Not Registered Technical Description

Fault Depth Definition

C100B00 is a specific Diagnostic Trouble Code (DTC) issued by the Tire Pressure Monitoring System (TPMS) in the vehicle electronic architecture system, with its core definition being: Right Rear TPMS Module ID Not Registered. In the communication architecture of the vehicle control network, this fault indicates that the controller responsible for managing the TPMS system cannot identify or verify the unique identity identifier (ID) of the sensor at the right rear position.

From a system interaction logic perspective, the determination of this DTC is directly associated with the system-level symptom of Left Domain Controller Partial Function Failure. This means that during the initialization phase or periodic communication handshake process of the vehicle's central electronic control unit (represented by the Left Domain Controller in this architecture), valid registration signals or checksums from the right rear wheel position sensor were not received. This typically occurs during the vehicle power-on self-test (Ignition On) or when performing tire pressure sensor activation/reset procedures. The system detects a mismatch in identification logic between the physical layer and the data link layer, subsequently marking this state as an unregistered fault and logging it into the failure memory.

Common Fault Symptoms

When C100B00 DTC is triggered and stored, drivers and on-board diagnostic systems may present the following perceptible abnormal behaviors:

• Dashboard displays warning information or icons related to partial Left Domain Controller function failure are lit up;
• In the vehicle central control screen or tire pressure monitoring system interface, right rear tire position shows missing or unstable pressure data;
• When entering repair mode, the system detects that the tire pressure monitoring module is not successfully included in the network node list;
• During driving, due to lack of physical position signal feedback from the right rear side, related safety redundancy systems may experience logic degradation.

Core Fault Cause Analysis

For this specific ID registration failure phenomenon of C100B00, after technical disassembly, the root causes of the fault are mainly concentrated in the following three dimensions of hardware and logic components:

1. Harness or Connector Fault The physical transmission path between the right rear tire pressure sensor and the domain controller is abnormal. This may involve open circuits, short circuits, or ground interference within the harness, causing wireless signals (RF) during the ID registration process to be unable to reach the receiving end completely, or poor contact in power/ground loops at physical connection points.

2. RF Controller Fault The radio controller responsible for processing high-frequency RF signals suffers from hardware damage or performance degradation. The main task of the RF controller is to demodulate pulse signals sent by the sensor and extract ID data. If the RF front-end inside this controller fails, it will be unable to correctly parse the digital fingerprint of the right rear sensor, thus determining "Not Registered".

3. Left Domain Controller Fault As the main processing unit, the Left Domain Controller (assuming TPMS gateway or management functions in this architecture) may have internal logic errors. Its firmware failed to correctly execute the ID write verification process, or the internal storage module cannot save registration records for new sensors, leading to system false reporting or handshake protocol failure.

4. Setup Fault This usually refers to logic errors existing in system initialization configuration, sensor pairing procedures (Synchronization), or software version management. For example, after performing tire pressure reset operations, the ID write and verification are not completed according to standard timing sequences, leaving the registration status in an intermediate state and not confirmed by the system as "Registered".

Technical Monitoring & Trigger Logic

The determination of this DTC is not random but based on the control unit's continuous assessment of specific monitoring parameters. The system triggers C100B00 display through the following logic mechanisms:

• Monitoring Targets: Primarily monitor wireless communication signal integrity, packet checksum (Checksum), and handshake protocol status (Handshake Protocol) of ID registration.
• Signal Characteristic Determination: Under vehicle power-on or specific trigger conditions, the control unit attempts to broadcast query instructions to designated nodes. If the intensity of the wireless RF pulse sequence corresponding to the right rear position is below a preset threshold value, or if the received digital ID does not match the database record, the system will mark as $ID_{Match} = False$.
• Operating Condition Dependency: This fault is typically monitored when the vehicle is in a static or low-speed driving stage, especially when the engine is on, ignition circuit supply voltage is within normal range (e.g., standard onboard voltage interval) but the sensor has no response.
• Trigger Logic: When the system continuously monitors that the right rear node fails to successfully complete $Registration_{Cycle}$ across multiple communication cycles and does not return a valid $ID_{Response}$, the controller will judge "ID Not Registered", and generate C100B00 DTC to alert the Left Domain Controller entering partial function failure state.