C050E00 - C050E00 Left Rear Wheel Speed Sensor Signal Line Short to Ground

meaning of this fault code is "Left Rear Wheel Speed Sensor Signal Shorted to Ground". In the system architecture, this fault defines a specific recognition of the physical state of the sensor loop by the control unit: that is, when the controller detects low or zero potential voltage, if this potential is abnormally connected to the chassis ground point (Ground), it is judged as an unexpected electrical short circuit between the signal line and the ground line. This change in electrical state means that the integrity of the data acquisition link for wheel speed information is compromised, causing the control unit to be unable to obtain accurate physical position and rotational speed feedback through Hall effect sensors or magnetic induction elements, thereby affecting real-time monitoring capability of wheel slip ratio.

Common Fault Symptoms

Based on the circuit state abnormality of C050E00, the following perceptible experience feedback may occur when the vehicle executes driving operations:

• Instrument Alarm Indication: Warning lights or fault indicator lights related to the Intelligent Dynamic Braking System may light up, indicating that system functionality is limited.
• Degraded Braking Performance: Due to missing left rear wheel signal, original functions such as anti-lock braking regulation, electronic braking force distribution, and vehicle stability control partially fail (Intelligent Dynamic Braking System Partial Function Failure).
• Driving Stability Warning: Under high-speed turning or emergency braking conditions, due to abnormal feedback circuit of single-side wheel speed data, it may cause ESP/ABS system intervention logic to change, causing vehicle dynamic response to deviate from expectation.
• Driving Mode Restriction: Some models may automatically restrict entering high power mode or sports mode due to this issue to prevent potential safety risks.

Core Fault Cause Analysis

For electrical diagnostic analysis of this fault code, the circuit connection and component status need to be checked from the following three hardware dimensions:

• Harness or Harness Connector： This is the highest external inducer for such short-circuit faults. When checking the signal loop of the left rear wheel speed sensor, if the harness insulation layer is damaged due to wear or squeeze, causing the signal core wire to directly contact the body metal ground point; or pin withdrawal oxidation and water ingress corrosion in the connector cause leakage current to ground, both will form a short circuit pathway from $GND$ to signal. Such physical connection abnormalities are usually directly related to line aging or external mechanical damage.
• Left Rear Wheel Speed Sensor： The sensor body or its built-in front-end circuit may fail. When the insulation of the internal coil winding of the sensor fails, or the chip end output pin suffers thermal breakdown under specific temperature conditions, causing the signal output terminal potential to be directly pulled down to ground level, this fault code can be triggered. In addition, short circuit caused by magnetic body adsorbent contamination is also a potential factor.
• Intelligent Dynamic Braking Controller： Although the probability is low, the internal signal input port circuit of the controller may become abnormal. For example, sampling circuit leakage to ground at the controller end, or control logic module misjudgment identifies it as a short circuit state when the signal line is normal. Such faults usually involve the controller's firmware verification or internal hardware aging.

Technical Monitoring and Trigger Logic

The vehicle's Intelligent Dynamic Braking System continuously monitors the integrity of electrical signals in various wheel sensor loops:

• Monitoring Target: The controller samples the voltage level of the left rear wheel speed sensor signal line in real time and compares it with the standard ground map (Ground) to determine if a short connection exists.
• Specific Condition Explanation: The trigger logic of this fault code is set to be effectively monitored only when the start switch is placed in ON gear. In the state where ignition is off, the system enters sleep mode and will not record such real-time data anomalies; once the driver turns the key or presses the button to put the vehicle into powered state (IGNITION ON), the control unit activates self-check procedures.
• Judgment Logic: When the sensor loop signal voltage remains at near-zero potential level close to ground for a continuous period, and does not fit the normal pulse signal amplitude range, after the controller confirms this status has not recovered in multiple detection cycles, the system will mark the fault code C050E00 and store it in non-volatile memory, waiting for the next ignition cycle to light up or clear verification.

cause ESP/ABS system intervention logic to change, causing vehicle dynamic response to deviate from expectation.

• Driving Mode Restriction: Some models may automatically restrict entering high power mode or sports mode due to this issue to prevent potential safety risks.

Core Fault Cause Analysis

For electrical diagnostic analysis of this fault code, the circuit connection and component status need to be checked from the following three hardware dimensions:

• Harness or Harness Connector： This is the highest external inducer for such short-circuit faults. When checking the signal loop of the left rear wheel speed sensor, if the harness insulation layer is damaged due to wear or squeeze, causing the signal core wire to directly contact the body metal ground point; or pin withdrawal oxidation and water ingress corrosion in the connector cause leakage current to ground, both will form a short circuit pathway from $GND$ to signal. Such physical connection abnormalities are usually directly related to line aging or external mechanical damage.
• Left Rear Wheel Speed Sensor： The sensor body or its built-in front-end circuit may fail. When the insulation of the internal coil winding of the sensor fails, or the chip end output pin suffers thermal breakdown under specific temperature conditions, causing the signal output terminal potential to be directly pulled down to ground level, this fault code can be triggered. In addition, short circuit caused by magnetic body adsorbent contamination is also a potential factor.
• Intelligent Dynamic Braking Controller： Although the probability is low, the internal signal input port circuit of the controller may become abnormal. For example, sampling circuit leakage to ground at the controller end, or control logic module misjudgment identifies it as a short circuit state when the signal line is normal. Such faults usually involve the controller's firmware verification or internal hardware aging.

Technical Monitoring and Trigger Logic

The vehicle's Intelligent Dynamic Braking System continuously monitors the integrity of electrical signals in various wheel sensor loops:

• Monitoring Target: The controller samples the voltage level of the left rear wheel speed sensor signal line in real time and compares it with the standard ground map (Ground) to determine if a short connection exists.
• Specific Condition Explanation: The trigger logic of this fault code is set to be effectively monitored only when the start switch is placed in ON gear. In the state where ignition is off, the system enters sleep mode and will not record such real-time data anomalies; once the driver turns the key or presses the button to put the vehicle into powered state (IGNITION ON), the control unit activates self-check procedures.
• Judgment Logic: When the sensor loop signal voltage remains at near-zero potential level close to ground for a continuous period, and does not fit the normal pulse signal amplitude range, after the controller confirms this status has not recovered in multiple detection cycles, the system will mark the fault code C050E00 and store it in non-volatile memory, waiting for the next ignition cycle to light up or clear verification.