Safety and driver assistance-related Diagnostic Trouble Codes (DTCs) provide critical insights into malfunctions in systems like airbags, anti-lock brakes (ABS), traction control, and advanced driver assistance systems (ADAS). Identifying and addressing these issues promptly is crucial to maintaining vehicle safety and optimal performance.

Common Safety and Assistance DTC Codes

1. C0035 – Left Front Wheel Speed Sensor Circuit Malfunction

   • Cause: A faulty speed sensor or damaged wiring impacts ABS performance.
   • Solution: Inspect and replace the speed sensor; check for wiring or connection issues.

2. C0040 – Right Front Wheel Speed Sensor Circuit Malfunction

   • Cause: Sensor failure or communication disruption between the wheel sensor and ABS module.
   • Solution: Replace the sensor or address wiring problems.

3. C1101 – Hydraulic Brake System Pressure Sensor Failure

   • Cause: Malfunctioning hydraulic pressure sensor or corroded connections.
   • Solution: Replace the pressure sensor and repair corroded connectors.

4. U0121 – Lost Communication with ABS Control Module

   • Cause: Wiring issues, loose connectors, or ABS module malfunction disrupt communication.
   • Solution: Check and repair wiring connections or replace the ABS module if needed.

5. U0101 – Lost Communication with Transmission Control Module (TCM)

   • Cause: Communication bus disruption due to wiring damage or TCM issues.
   • Solution: Inspect and repair the communication bus or replace the TCM.

6. C1233 – ABS Hydraulic Pump Circuit Failure

   • Cause: A short circuit or power loss in the ABS hydraulic pump motor circuit.
   • Solution: Check the motor circuit wiring and replace any damaged components.

7. B1401 – Airbag Sensor Malfunction

   • Cause: Faulty airbag sensors or loose connections interfere with airbag deployment readiness.
   • Solution: Replace faulty airbag sensors and ensure all connectors are secure.

8. U0155 – Lost Communication with Instrument Panel Cluster (IPC)

   • Cause: Wiring or software malfunction preventing communication with the dashboard.
   • Solution: Update the software or repair wiring to restore communication.

Troubleshooting and Maintenance Tips

• Regular Inspections: Ensure sensors and modules are clean, properly connected, and not exposed to corrosion.
• Diagnostic Tools: Use OBD-II scanners to retrieve DTC codes and guide troubleshooting efforts.
• Software Updates: Keep control modules up to date to prevent communication errors.
• Preventive Maintenance: Regularly inspect wiring harnesses and connectors to avoid unexpected malfunctions.

These codes provide essential insights into the functionality of your vehicle's safety systems. Addressing these DTCs promptly helps maintain optimal vehicle safety and ensures that driver assistance systems operate correctly.

Recommended Reading and Internal Links

• Why Need DTC (Diagnostic Trouble Codes) Management
• What is The Role of Datalogs and DTC
• Powertrain-Related DTCs
• Sensor and Communication Module DTCs
• Emissions and Fuel System DTCs
• Transmission and TCU Module DTCs
• ECU Internal Error DTCs
• Boost System DTCs
• Safety and Assistance DTCs
• Intake and Cooling System DTCs
• Electrical System DTCs

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