What does fault code C0084 mean?
2 Answers
Fault code C0084 indicates a malfunction in the Traction Control System (TCS), and the fault code needs to be cleared. The function of the Traction Control System (TCS) is to control torque output by measures such as retarding ignition timing when it detects wheel slip, preventing the torque converter from locking up. When clearing the fault code, it is essential to follow the specified method for the particular vehicle model. Do not directly disconnect the negative battery cable, as this may lead to the following issues: 1. Some vehicle models' control modules may lose "historical records." Most central control modules have memory functions, and disconnecting the negative battery cable may erase engine operation data stored in the random-access memory. 2. Normal functions may be lost, such as the audio system's lock function, which would then require repair.
Fault code C0084 typically indicates an issue with the brake fluid pressure sensor circuit. I often encounter this situation when repairing cars, and it's usually caused by a faulty sensor or poor electrical contact. Sometimes, unstable wheel speed sensor signals can also trigger this code. It's recommended to first check if the sensor connector is loose or water-damaged, then test the circuit continuity. If these are not the problem, there's an 80% chance the sensor needs replacement. During repairs, don't forget to check the fuses of related circuits. Some German cars may also show a brake assist system malfunction indicator light. This fault code isn't a major issue but can affect ABS operation. It's best to address it promptly to avoid problems during emergency braking.
