What is the problem with fault code C0078?

[TaylorLee]

Fault code C0078 refers to tire diameter. The following is a detailed introduction to fault code C0078: 1. Fault code C0078, applicable to all car manufacturers, means tire diameter (sub-error). Whenever a car fault is eliminated, the fault code needs to be cleared. 2. When clearing the code, it must be done strictly according to the fault code clearing method specified for the specific vehicle model. Be very careful not to simply remove the negative ground cable of the battery to clear the fault code. This operation cannot eliminate the fault, but can only cause potential danger.

[McOlivia]

Fault code C0078 indicates an issue with the right rear wheel speed sensor in the car's ABS system, which monitors wheel speed to help prevent brake lock-up. Common problems include the sensor being covered by dirt or debris, poor wiring contact or short circuits, loose connectors, or internal component failure of the sensor. Once the sensor fails, the ABS light will illuminate, and the vehicle may skid or become unstable during emergency braking, increasing the risk of an accident. I've dealt with similar situations before—first, check if the sensor is covered in mud or dirt and clean it with compressed air. If that doesn’t work, test the wiring resistance with a multimeter. If the resistance is too low or too high, it means the sensor needs replacement. Finally, it’s recommended to visit a professional repair shop as soon as possible to avoid compromising safety.

[StNorah]

Fault code C0078 indicates a malfunction in the right rear wheel speed sensor, which may cause the ABS system to stop working, leading to unstable vehicle behavior during emergency braking and posing a threat to driving safety. I often remind car owners to start with simple checks, such as inspecting whether the sensor is blocked by road debris—especially after rain or snow when water accumulation is common—or checking for loose wiring connectors by unplugging and replugging them. If the warning light remains on, it might indicate an internal circuit issue. Delaying repairs could also lead to damage to other braking components, so it's best to have a technician use a diagnostic tool to read the data stream and ensure parameters are normal. Replacing the part isn't expensive, costing around a hundred yuan. The key is not to ignore the warning light—always confirm the system is functioning properly before driving.

[Millard]

C0078 is the fault code for the right rear wheel speed sensor. Common causes include sensor aging, wear, circuit shorting, or connector oxidation. Having driven for over a decade, I've encountered similar issues. When the ABS malfunctions, the brakes feel stiff, especially on slippery roads, which is dangerous. To address this, try cleaning the sensor to remove dirt. If that doesn't work, you may need to replace it. Remember, regular maintenance can prevent such problems—simple and cost-effective.