C113116 - C113116 Right Actuator Power Supply Undervoltage Fault

C113116 Right Actuator Supply Under-Voltage Fault Analysis

Fault Depth Definition

DTC C113116 belongs to the Electronic Parking Brake (EPB) diagnostic trouble code, specifically for the right actuator supply under-voltage state. In the architecture of the rear domain controller, this code indicates that the control unit detected the voltage signal supplied to the right parking brake actuator is below a predetermined normal threshold. When the control logic detects this voltage anomaly, it implies insufficient power during instruction reception, potentially preventing mechanical action from completing. This fault code reflects voltage stability issues between the power distribution module and motor ports within the vehicle's electronic electrical architecture, falling under key safety monitoring categories in the overall EE architecture.

Common Fault Symptoms

When a vehicle exhibits DTC C113116, the driver and diagnostic tools may observe the following specific manifestations:

• Instrument Panel Indicator Feedback: Parking brake warning light (or EPB system fault light) illuminates, indicating electronic control anomaly.
• Function Execution Hindered: The right parking brake may fail to complete locking or unlocking operations during actuator action, exhibiting "brake dragging" or "cannot release" phenomena.
• System Status Storage: Fault code is written into the vehicle OBD system memory; in some models, related functions (such as auto return) may be disabled, requiring specific reset verification to clear warnings.

Core Fault Cause Analysis

According to diagnostic data, the root cause of this fault can be precisely located to the following three physical or logical dimensions:

• Hardware Component Failure: Fuse blown (Fuse Blown). This is the most direct result of overcurrent protection triggering; if upstream power is cut off, actuator end voltage inevitably drops.
• Wiring Connection Abnormalities: Wiring harness or connector faults (Wiring Harness or Connector Faults). Includes physical breaks in the supply circuit, poor contact at pins, or ground shorts/leakage caused by insulation wear, leading to effective supply voltage attenuation.
• Controller Logic Calculation: Rear Domain Controller fault (Rear Domain Controller Fault). When external circuits are normal but internal power management circuits drift, or internal control chips cannot correctly identify voltage thresholds, the system incorrectly judges an under-voltage state.

Technical Monitoring and Trigger Logic

Generation of this fault code follows strict Electronic Control Unit (ECU) diagnostic cycle algorithms; specific monitoring mechanisms are as follows:

• Operational Pre-conditions: Start switch in ON position, and EPB switch action completes initialization handshake, system enters real-time power monitoring stage.
• Monitored Parameter: Rear domain controller continuously scans real-time voltage value of right actuator supply wiring (Supply Voltage).
• Judgment Logic Flow: When the system issues a right parking brake command, validation module samples and compares voltage signal; if actual monitored voltage cannot meet minimum operating level required for actuator action, "Validation Failed" judgment is triggered.
• Fault Confirmation Condition: Validation failed for right parking brake during checking. Once conditions above hold within diagnostic cycle, control unit immediately records fault code C113116 and illuminates dashboard warning to isolate potential safety risks.