An intermittent ABS issue can be frustrating. This guide delves into the Audi VCDS code 01435 (implausible signal) and provides troubleshooting steps to help pinpoint the cause. This specific code often appears shortly after starting the car and beginning to drive, even though brake tests reveal no apparent problems.
Decoding Audi VCDS Code 01435
The 01435 code points to a problem with Brake Pressure Sensor 1 (G201), specifically an implausible signal. This suggests the sensor is sending data that doesn’t align with what the ABS control module expects. While the brakes may function normally during testing, the intermittent nature of the fault and the logged code indicate an underlying issue. Clearing the code often provides temporary relief, with the problem resurfacing later.
Possible Causes and Troubleshooting Steps
Several factors can contribute to the 01435 fault code:
1. Faulty Brake Pressure Sensor 1 (G201)
Although brake tests seem normal, the sensor itself might be malfunctioning intermittently. A diagnostic check using VCDS to monitor live data from G201 while driving can reveal inconsistencies in the pressure readings. A temporary negative pressure reading, as observed by the original poster, further supports this possibility.
Solution: Replace the brake pressure sensor.
2. Wiring Issues
Damaged or corroded wiring between the sensor and the ABS module can disrupt signal transmission, leading to an implausible signal error.
Solution: Thoroughly inspect the wiring harness for any visible damage. Use a multimeter to check for continuity and resistance within the specified range. Repair or replace any faulty wiring.
3. ABS Module Malfunction
While less likely, a problem within the ABS module itself could be misinterpreting the sensor data.
Solution: This is a complex diagnosis. Before replacing the module, exhaust all other possibilities. A professional diagnosis with advanced tools may be necessary.
4. Brake Light Switch
Though already replaced, ensure the new switch is correctly installed and functioning as intended. An improperly adjusted or faulty switch can interfere with the ABS system.
Solution: Double-check the installation and perform a functionality test.
Addressing Related Fault Codes
The provided full vehicle scan reveals other fault codes in various modules. While seemingly unrelated, addressing these issues might indirectly resolve the 01435 code. For example, the fault code in the ABS module referencing the DTC memory of the ABS controller (Address 01: Engine, 005715) warrants investigation.
Conclusion
Troubleshooting the Audi VCDS code 01435 requires a systematic approach. Start with the most probable causes, such as the brake pressure sensor and wiring, before considering more complex issues like the ABS module. Addressing all logged fault codes is crucial for comprehensive vehicle health. If the problem persists after these steps, consult a qualified Audi technician for further diagnosis and repair.
