C100B00 - C100B00 Right Rear TPMS Module ID Not Registered

Analysis of DTC C100B00 Right Rear TPMS Module ID Not Registered

### Fault Depth Definition

C100B00 Right Rear TPMS Module ID Not Registered is a specific Diagnostic Trouble Code (DTC) generated by the Tire Pressure Monitoring System (TPMS) within the vehicle's electronic control system (such as TCU or Body Domain Controller). In the on-board network architecture, the core significance of this DTC lies in the primary control unit's inability to establish a unique identity link with the designated location pressure sensor. When the system executes an initialization procedure or periodic communication scan, the control unit attempts to read the radio frequency broadcast signal from the right rear tire pressure sensor but fails to successfully match the pre-stored Unique Identifier. This state indicates that the vehicle has lost its real-time tracking capability of the physical position in the right rear wheel area, belonging to abnormalities at the communication protocol handshake or device registration logic level.

### Common Fault Symptoms

When this DTC is triggered and recorded, the driver and onboard diagnostic system will present the following perceptible manifestations:

• Dashboard Display Anomaly: The TPMS warning light on the instrument cluster illuminates, and the system information message explicitly states "TPMS function partially invalid" or that a specific location is not registered.
• Data Stream Absence: In the vehicle's central display or the diagnosis interface of dedicated repair tools, the data area corresponding to the Right Rear Tire presents as an error code, blank state, or "--" identifier.
• Safety Warning Degradation: The system cannot monitor the tire pressure numerical values and temperature changes for the right rear wheel in real time, causing the depressurization protection function of this wheel to be temporarily inactive, affecting driving safety evaluation.

### Core Fault Cause Analysis

Regarding DTC C100B00 Right Rear TPMS Module ID Not Registered, potential triggers need to be analyzed from the following three technical dimensions:

• Hardware Component Level: The integrated chip inside the pressure sensor at the right rear tire position has occurred damage, or its EEPROM storage unit failed, resulting in the inability to generate or maintain a stable physical ID signal; the sensor antenna coil is corroded or broken, leading to insufficient radio frequency transmission power.
• Wiring/Connector (Communication Environment) Level: Although this fault mainly manifests as wireless communication anomalies, excessive interference from the vehicle body shielding layer or strong electromagnetic sources existing inside the vehicle may suppress the module's ID broadcast signal; simultaneously, the vehicle body grounding system needs inspection for loose connections, affecting sensor power supply stability.
• Controller (Logic Operation) Level: In the internal memory of the vehicle TPMS control unit, the registration mapping table data regarding the right rear wheel is lost; or during first pairing, the primary control unit failed to correctly verify the incoming ID feature code, leading the system to judge as ID not registered rather than a simple signal loss.

### Technical Monitoring and Trigger Logic

The system's fault judgment is based on strict timing and protocol logic, with its core working principle as follows:

• Monitoring Target: The control unit continuously monitors the radio frequency response signals emitted by sensors at the right rear location, focusing on verifying whether the unique identifier (ID Code) carried in the signal matches the registration list stored in the control end.
• Trigger Condition: When the ignition switch is turned on to the running position (ON position) or after the system completes a reboot initialization, if the primary control unit does not receive an ID identifier conforming to the expected protocol within the set scan time window $T_{scan}$, it enters the abnormal judgment process.
• Judgment Logic: The system sets a fault tolerance threshold allowing communication retries. Once in continuous multiple communication cycles (Cycle), the broadcast signal of the right rear tire sensor fails identity verification or is not received by the host, the system confirms the hardware unregistered status and formally stores DTC C100B00, while illuminating the instrument warning light to prompt partial function invalidation.