C116006 - C116006 Left and Right Motor Status Mode Fault

C116006 Fault Depth Definition

In the vehicle electronic electrical architecture, fault code C116006 is defined as "Left/Right Motor Status Mode Failure". This code belongs to the chassis control network or body electrical control system, specifically monitoring the actuator logic of the Electronic Parking Brake (EPB). This fault code indicates that the system control unit cannot correctly acquire or verify the real-time working status signals of the brake caliper motors on both sides.

In the system's feedback loop, the Rear Domain Controller is responsible for receiving pulse signals and physical position feedback data from the actuation motors. When "Motor Status Mode" becomes abnormal, it means the control unit failed to establish an effective communication link or did not detect the expected action response sequence. This directly relates to the integrity of the electronic parking function and belongs to core monitoring indicators involving vehicle static parking safety. The fault code not only reflects physical status failure of the actuation components but also covers logical determination errors within the controller regarding motor operating modes.

Common Fault Symptoms

When C116006 fault is activated and recorded, the driver and vehicle onboard diagnostic systems will observe the following intuitive forms of manifestation, which are direct manifestations of system function failure:

• Complete EPB System Function Failure: Electronic handbrake cannot execute pull-up or release operations; physical braking action relies on traditional mechanical handbrake (if equipped).
• Dashboard Warning Light Illuminated: The electronic parking brake indicator light on the dashboard stays on or flashes, indicating system fault to the driver.
• System Enters Protection Mode: To prevent releasing parking force in an unknown state, the system may forcibly lock the motor driver circuit.
• Self-Learning Function Cannot Be Completed: Vehicle parking position memory function (Auto-hold) fails, and parking force calibration failure may accompany it.
• Related Driving Logs Recorded: Control unit internal fault counter increases, indicating DTC history data needs to be read for analysis.

Core Fault Cause Analysis

According to diagnostic data logic, this fault is triggered by abnormal states in the following three dimensions, strictly distinguishing physical hardware from electronic circuit failure levels:

1. Hardware Component Failure (Actuator Layer) Mainly involves internal element damage of the left/right brake caliper motors themselves. This includes motor commutator burnout, drive chip short circuit, or mechanical wear between rotor and stator causing loss of feedback signals. Such faults cause the controller to send commands after which the motor cannot produce expected electromagnetic force or return status data.

2. Wiring and Connector Failures (Physical Connection Layer) Covers harness insulation performance degradation, open or short circuits, as well as connector terminal corrosion, loosening, or excessive contact resistance. Intact integrity of signal transmission channels interrupts bidirectional communication between control unit and motor, leading to loss of status mode data. Such faults typically manifest as intermittent false alarms changing with vibration.

3. Controller Logic Calculation Abnormality (Processing Unit Layer) Refers to abnormal internal processing programs or logic circuits within the Rear Domain Controller. When the controller cannot correctly parse pulse signals from motors, or its internal stored calibration parameters become invalid, the system also judges it as a status mode fault. This level excludes internal control errors after physical components and external wiring problems are excluded.

Technical Monitoring and Trigger Logic

The system's monitoring of electronic parking status follows strict real-time standards, with specific trigger logic based on the following conditions:

• Monitoring Targets Control unit continuously reads feedback signals from left/right brake caliper motors, focusing on motor drive voltage, position pulse frequency of resolver (or Hall sensor) and fault code feedback status. System must ensure signal integrity during actuation process.

• Trigger Conditions and Operating Conditions Specific operating condition for fault determination is: Ignition Switch in ON Position. In this state, the Electronic Control Unit enters self-check mode and activates motor driver circuit monitoring module. If under above conditions, controller detects left/right motor status feedback data does not match preset thresholds, or communication protocol validation fails (e.g., CAN bus communication timeout), it immediately records C116006 fault code.

• Signal Monitoring Thresholds System compares received motor status mode data stream with control logic expected values. Once data stream interrupted or status field parsed exceeds logic range, trigger condition satisfied, diagnostic event is confirmed stored.