C113117 - C113117 Right Actuator Power Supply Overvoltage Fault

C113117 Deep Analysis of Right Actuator Supply Overvoltage Fault

Fault Definition

C113117 is a diagnostic trouble code in the Electronic Parking Brake System, core defined as Right Actuator Supply Overvoltage. In the vehicle domain controller architecture, triggering this fault code means the control unit detects input voltage supplied to the right actuator exceeding preset safety thresholds. This fault directly relates to whole-vehicle high-voltage power management network and body domain control stability, aiming to prevent actuator internal drive circuit breakdown, motor runaway, or mechanical structure damage due to high input voltage. This fault code reflects real-time perception and logic protection mechanisms of the system against abnormal supply loop voltage states, being a key indicator regarding Power Integrity monitoring in the electronic electrical architecture.

Common Symptoms

When C113117 fault code is triggered and stored, owners or diagnostic technicians can observe the following phenomena on terminals:

• Electronic parking brake system function failure, manifested as inability to execute braking lock commands or insensitive release operation.
• Parking brake warning light may illuminate on the instrument panel (EPB Warning Light), indicating to users that the vehicle is not in a safe parked state.
• Vehicle enters limp mode, control logic of relevant drive motor or lock-up mechanism disabled to protect hardware.

Core Failure Cause Analysis

Based on the technical architecture of original data, causes of this fault can be analyzed from following three dimensions:

• Hardware Components (Power Supply Side): Mainly involves Start Iron Battery Fault and On-Board Power Assembly Fault. When battery pack cell voltage inconsistent, total output end voltage abnormally high, or onboard power regulation module voltage regulation function fails, it leads to bus voltage delivered to actuator exceeding rated range.
• Wiring/Connectors (Physical Connection Side): Although original data did not directly list wire harness open circuit, the overvoltage phenomenon of Supply Voltage >16V often involves electrical characteristics of connection ports. Need to consider from technical principle impedance abnormality between power source and actuator, connector poor contact or insulation layer damage leading to high potential conduction risk.
• Controller (Logic Operation Side): Involves Rear Domain Controller Fault. If controller internal voltage sampling circuit calibration offset, or software judgment logic of protection threshold errors, may also cause system misjudgment of actually normal voltage as overvoltage state, need to combine voltage sensor data for logic verification.

Technical Monitoring & Trigger Logic

Determination of this fault code is based on precise electrical parameter acquisition and time logic control:

• Monitoring Target: System real-time samples bus input voltage signal in right actuator supply loop.
• Numerical Range Determination: Fault trigger must meet specific voltage threshold, when monitored supply voltage $>16V$, system enters fault warning state.
• Duration Requirement: To ensure distinguishing instantaneous interference (like voltage spike caused by relay closure) from continuous faults, set condition requires duration of overvoltage state $\geq 2s$.
• Specific Condition Trigger: Above monitoring and determination logic only activated during ON switch positioned period. This design ensures vehicle is powered but not fully driving or static self-check status, can effectively identify abnormal power supply end.