The vehicle speed sensor informs the engine control module (ECM) of the vehicle’s speed. This data is sent to the speedometer, which displays the road speed in miles per hour or kilometers per hour. Vehicle speed data is typically shared with the transmission, ABS, traction control, and power steering systems.
P2159 is a generic trouble code related to a fault in this sensor. Read on to learn more about this trouble code.
What Does the P2159 Code Mean?
Diagnostic trouble code P2159 stands for “Vehicle Speed Sensor B Range/Performance.” The code is set once the powertrain control module (PCM) detects an inaccurate or irrational reading from your ride’s vehicle speed sensor (VSS).
The VSS is usually located near the transmission housing. It has a rotating reluctor ring that’s used to complete an input circuit to the PCM. As the reluctor ring comes in contact with the electromagnetic tip of the VSS, the notches and grooves interrupt the circuit rapidly. The PCM interprets these circuit manipulations as transmission output speed or vehicle speed. Once the PCM detects any fault in the reading, it’ll trigger the P2159 code.
Note: The definition of code P2159 can differ according to the vehicle manufacturer. Check the appropriate repair manual or repair database for the exact code definition.
What Are the Possible Causes of the P2159 Code?
- Malfunctioning VSS “B”
- Circuit problems, such as a damaged wire or poor connection
- An issue with the PCM, such as software in need of an update
What Are the Possible Symptoms of the P2159 Code?
- Illuminated check engine light
- Issues with the anti-lock brakes
- Illuminated anti-lock or brake warning lights
- Faulty speedometer or odometer
- Erratic automatic transmission shift
How to Diagnose the P2159 Code
DTC P2159 can occur in a variety of vehicles. This does not, however, imply that there is a universal solution to this problem. Keep in mind that vehicles can be structured differently depending on the manufacturer.
Take your vehicle to an auto repair shop and have it diagnosed by a mechanic if you’re unfamiliar with vehicle speed sensors.
How to Fix the P2159 Code
It is not always simple to clear trouble codes. Because P2159 involves circuits within the PCM, repairs can be difficult if you don’t have the necessary tools and skills. We recommend taking your vehicle to a professional if you are unfamiliar with vehicle repair.
If you’re a seasoned DIYer looking to save money, we recommend doing your homework and brushing up on vehicle-specific repair knowledge.
Repair manuals or a subscription to an online repair database can provide you with information on the precise diagnostic and repair process to remove code P2159.
Where To Get Parts To Resolve DTC P2159
If your vehicle’s speed sensor is malfunctioning and triggering the P2159 code, you might experience issues with your anti-lock brakes and speedometer. This can be a real safety hazard. After all, anti-lock brakes are meant to keep your vehicle from skidding, and if they aren’t triggering when they should, it can easily lead to an accident. Thankfully, buying a replacement speed sensor is easy with CarParts.com.
With a few easy clicks, you’ll be able to place an order on the easy-to-navigate CarParts.com website. Be sure to use our built-in vehicle selector to guarantee the speed sensors you see fit your car. Scroll through our wide selection of aftermarket parts to find one that suits both your preferred price point and your vehicle. You can purchase with confidence from CarParts.com, thanks to our price-match guarantee and 60-day return policy.
Don’t wait for your VSS to fail completely. Check out our selection of vehicle speed sensors at CarParts.com and order today.
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