What does fault code C0074 mean?

[Johnson]

C0074 fault code applies to all automobile manufacturers, meaning requested driving torque. More relevant information is as follows: 1. This fault code is related to the torque management of the Traction Control System (TCS). If the system detects rear wheel slippage, the Electronic Brake Control Module (EBCM) will request the Powertrain Control Module (PCM) to reduce torque. There are two wires between the EBCM and PCM. One is responsible for sending the requested torque from the EBCM to the PCM, and the other sends the delivered torque from the PCM back to the EBCM. 2. After troubleshooting the vehicle, the fault code must be cleared. When clearing the code, it is essential to strictly follow the specific vehicle's prescribed fault code clearing method. Under no circumstances should the negative ground cable be disconnected to clear the fault code. Otherwise, it may cause the following two issues: First, it can lead to the loss of normal records in the control center computer of some vehicle models. Many car owners are aware that most vehicle central computers have a memory function. If the negative battery cable is disconnected, it will automatically clear the engine operation experience data stored in the Random Access Memory (RAM). Second, it may also result in the loss of certain functions, such as frequently losing the audio lock feature.

[DelWalter]

My old car previously had a C0074 trouble code, which really worried me. After researching, I found that this is usually related to the anti-lock braking system, such as issues with the wheel speed sensor, especially the left front wheel sensor which is prone to getting dirty or being interfered with by magnetic materials, leading to inaccurate signals. The ABS warning light would come on, and the system might fail during braking, affecting driving safety. I initially tried cleaning the sensor and magnetic ring myself with a soft cloth, but it didn't solve the problem, so I had to take it to the repair shop. The mechanic used a diagnostic tool and said the sensor wiring or connector was loose, or the module itself was faulty, and recommended replacing the sensor. After installing a new part, the issue disappeared, and the whole process cost a little over 200 yuan. I recommend that fellow car owners not delay if they encounter a similar situation—if the ABS isn't working, the wheels may lock up during emergency braking, increasing the risk of skidding.

[VonPreston]

When driving my friend's off-road vehicle, I encountered the ABS light displaying code C0074. After searching online, I found that it indicates a wheel speed sensor malfunction, often caused by the sensor being blocked by mud or damaged wiring leading to signal loss, which disables the anti-lock braking function. Braking on bumpy roads with this issue can cause the wheels to lock up, which is quite dangerous. I did a quick check under the car and didn't find large mud deposits around the sensor, but the connector seemed loose. After tightening it with a wrench and restarting the car, the fault temporarily disappeared. However, it reappeared a few days later, confirming that the internal sensor is aged and needs replacement. Many older vehicles are prone to this issue, especially after off-roading or driving in rainy conditions. Remember not to tamper with the electrical circuits yourself—accidental electric shock or mishandling could cause more severe damage to other components. It's best to seek professional repair services promptly.

[Kyle]

C0074 is a common ABS system fault code, usually indicating a wheel sensor signal error. For example, the sensor may be blocked by oil or metal debris, preventing it from measuring wheel speed, or the magnetic ring may be damaged, causing the computer to inaccurately determine braking pressure and automatically disabling the ABS function. During repairs, use tools to check circuit continuity, clean the contacts, and replace the sensor if necessary. When driving, avoid muddy roads to prevent dirt buildup.