C113117 - C113117 Right Side Actuator Supply Over Voltage Fault

H1: C113117 Right Actuator Supply Overvoltage Fault Diagnosis Description

Detailed Fault Definition

C113117 Right Actuator Supply Overvoltage Fault is an important self-learning status code recorded by the Electronically Parked Brake System (EPB) Control Unit. The core logic of this fault code lies in monitoring the power supply stability assigned to the right actuator. In the vehicle's electrical architecture, the control unit continuously monitors voltage signals from the power side to ensure that the motor accurately achieves the physical position and rotational speed during actuator actions (such as clamping or releasing brake pads). When the system detects that the actual voltage value input to the actuator exceeds the preset safety logic threshold, the control unit judges that there is abnormal fluctuation or external interference in the power supply network and activates this fault code. This definition clarifies the role of this code in the vehicle's electronic electrical architecture: it is a critical node in the voltage monitoring feedback loop, aimed at preventing coil burnout of the actuator or internal circuit damage caused by overvoltage.

Common Fault Symptoms

When the C113117 fault code is stored and clearing conditions are not met, car owners and maintenance technicians may observe the following specific driving experience and system feedback phenomena:

• Right Rear Caliper Motor Function Failure: This is the most direct physical manifestation; the actuator may be unable to respond to control signals for mechanical motion.
• Dashboard Warning Light Illumination: The vehicle's Electronic Parking System (EPB), ESP, or Engine Fault Lights may stay on or flash, alerting the driver of potential risks in the braking system.
• Electronic Handbrake Operation Anomaly: When attempting to pull up or release the electronic handbrake after turning on the ignition switch, the operation may respond without reaction, abnormal sound, or delay.
• Vehicle Stationary State Instability: Due to the right rear wheel caliper motor possibly being in a seized or intermediate state unable to release fully, there is a risk of automatic vehicle movement.

Core Fault Cause Analysis

For the essence of C113117 power supply overvoltage, technical root cause troubleshooting must follow a logical architecture in three dimensions: hardware, wiring, and controller:

• Hardware Component Level This dimension is mainly associated with internal or external elements of physical entities. Issues with the charging system explicitly indicated by original data belong to this category; its essence is unstable output voltage from the vehicle's main power supply end (such as the generator or battery), causing overvoltage signals to enter the actuator. Right Rear Caliper Motor Failure is also attributed to this list; internal coil short circuit or insulation aging in the motor may cause abnormal current, leading to reverse feedback voltage increase.
• Wiring and Connector Level Although original data does not directly describe wiring physical connections, "power supply overvoltage" phenomena usually imply potential issues with line impedance or ground return loops. In hardware fault analysis, it is necessary to consider damage to the harness shield layer between the charging system and the actuator, too high contact resistance or loose connection at connectors, which may all cause voltage spikes, leading the control unit to misjudge overvoltage signals.
• Controller Level Original data explicitly points out Electronic Parking Controller Failure. If components within the power management module (PMIC) inside the control unit are aged or logic calculation errors exist, it may lead to inaccurate sampling of input voltage, thus erroneously judging a C113117 fault without external overvoltage.

Technical Monitoring and Trigger Logic

The generation of this fault code strictly relies on the real-time diagnostic strategy of the vehicle control unit, whose trigger logic includes specific monitoring targets, numerical conditions, and operating condition restrictions:

• Monitoring Target: The control unit mainly monitors the voltage signal intensity under Right Actuator Supply Overvoltage status. The system will continuously read the instantaneous voltage value applied to the actuator input terminal.
• Numerical Range Judgment: When it is detected that the power supply voltage exceeds the safety upper limit threshold set internally by the electronic parking controller (i.e., at abnormal high potential state), the fault logic is activated.
• Specific Operating Condition Trigger: According to original data requirements, the specific operating condition for this fault determination is Ignition Switch Placed in ON Position. This means that only when the ignition system is powered on but the engine is not started will the control unit enter voltage self-check mode and record overvoltage events; if the engine is off or switch closed, this monitoring logic will pause.