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What does fault code C0020 mean?

3 Answers

Henry

07/29/25 11:47am

Fault code C0020 refers to an anti-lock braking system (ABS) pump motor control error. Troubleshooting steps for ABS system faults: 1. Select to read the fault code, and inspect and repair the faulty part according to the diagnostic tool's fault code prompt; 2. Based on the fault code prompt, check the wheel speed sensor. The function of the anti-lock braking system is to prevent wheel lock-up, allowing the car to steer while braking, ensuring the stability of the car's braking direction and preventing skidding and deviation. In the ABS system, the solenoid valve can prevent tire lock-up by quickly releasing the braking pressure to a certain tire, and the role of the ABS pump is to maintain system pressure.

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McIsaac

08/13/25 8:36pm

I was recently startled by a fault code C0020 appearing in my car. After quickly checking the information, I found out it was an issue with the right rear wheel speed sensor. It mainly affects the anti-lock braking system, causing the ABS warning light to come on. This could make braking worse on slippery roads, increasing the risk. Possible causes include aging wiring, a damaged sensor, or loose connections. From my experience, as soon as it appears, drive to a repair shop. The mechanic confirmed the sensor was faulty, and after replacing it, everything returned to normal. Safe driving should never be overlooked. If you notice a problem, act immediately. Otherwise, during high-speed emergency braking, you might lose control, leading to serious consequences. It's advised not to tamper with it yourself; seek professional inspection to ensure safety first.

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SarahDella

10/08/25 6:33am

As someone who works with various vehicles in the workshop year-round, the C0020 trouble code is a common issue. It usually indicates a circuit malfunction in the right rear wheel speed sensor, which could be due to internal component failure in the sensor, wiring wear, disconnection, or poor contact at the connector. Once these problems occur, the ABS system cannot function accurately, and the ABS light on the dashboard will illuminate. During driving, especially in rainy or snowy conditions, brake assist may fail, increasing the risk of skidding. The diagnostic process requires using a scanner to check the sensor signal quality and a multimeter to test circuit continuity. Common solutions include cleaning the connectors or replacing faulty components. Don't delay repairs to prevent minor issues from escalating into major accidents. Safety should always be the top priority.

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