The anti-lock braking system (ABS) is a safety feature that prevents the wheels from locking when braking suddenly. It helps drivers stay in control of their vehicles even when the roads are slippery. The ABS gets information from wheel speed sensors to determine when to apply or release the brakes. C0055 is a generic trouble code related to a fault in the rear wheel speed sensor circuit.
What Does the C0055 Code Mean?
Diagnostic trouble code C0055 stands for “Rear Wheel Speed Sensor Circuit.”
Wheel speed sensors (WSS) typically produce a voltage in response to the changing magnetic field produced when the vehicle is in motion or when its wheels are rotating. A reluctor, which is essentially a toothed ring, rotates with the wheel assembly.
The sensors produce an alternating current (AC) voltage as the reluctor turns. The sensor signal’s frequency and amplitude increase as the wheel rotates faster.
Modern vehicles typically have four-wheel speed sensors, but some rely only on one. Most pickup trucks use only one rear wheel speed sensor, which is known as the vehicle speed sensor (VSS). Its sensor signal is usually routed to the engine control module (ECM), which relays the information to the ABS module.
The C0055 code is set once the ABS module detects a problem with the rear wheel speed sensor and/or its circuit.
Note: The definition of code C0055 can differ depending on the vehicle manufacturer. Check the appropriate repair manual or repair database for the exact code definition.
What Are the Common Causes of the C0055 Code?
- Malfunctioning wheel speed sensor/vehicle speed sensor
- Wiring issues
- Bad control module
What Are the Common Symptoms of the C0055 Code?
- Malfunctioning ABS
- Illuminated ABS warning light
- Other warning lights can also be illuminated (e.g., traction control)
- ABS disabled
How to Diagnose the C0055 Code
DTC C0055 can be logged on various makes and models. However, this does not mean that there’s a universal fix for this problem.
If you’re unfamiliar with ABS, wheel speed sensors, or vehicle repair in general, you should take your ride to an auto repair shop and have it diagnosed by a mechanic. Otherwise, you can do it yourself. Here’s a video that will give you an idea of what the diagnostic process might entail:
How to Fix the C0055 Code
Fixing any trouble code can be tricky—and DTC C0055 is no exception. So if you’re not familiar with vehicle repair, we recommend taking your vehicle to a mechanic.
If you’re an experienced DIYer who’s ready to take on the challenge, you can go ahead and resolve the issue yourself. But before attempting to repair your ride, it’s good to refresh your knowledge by reading resources with vehicle-specific repair information.
Repair manuals like those from Chilton or a subscription to an online repair database can give you the right information to clear code C0055.
How to Get a Replacement Wheel Speed Sensor
No matter what other people say, driving around with a damaged wheel speed sensor isn’t a good idea. Your brakes are likely to lock up suddenly, putting you at greater risk of getting into an accident. Thankfully, getting brand-new wheel speed sensors is fast and easy with CarParts.com.
CarParts.com offers a wide selection of wheel speed sensors, all sourced from the most trusted manufacturers in the industry. You can easily browse through them with the help of our vehicle selector and search filters too, just be sure to input your car’s correct details. If you’re in a rush to get back on the road, you’ll be pleased to know that CarParts.com also guarantees fast shipping. Order by 12 p.m. ET, and you can expect your new wheel speed sensor to arrive in as fast as two business days.
Don’t wait for the worst-case scenario to happen before replacing your wheel speed sensors. Check out our catalog of wheel speed sensors at CarParts.com today.
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