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Auto ... 2/26/2018

2014 BMW 550i GT Base 8 Cyl 4.40L

Preventive Maintenance

What is the function of Speed Sensor B Range of car? What are the causes of P2159 OBD-II Trouble Code?

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PartsAvatar Ca

PartsAvatar Ca 2/26/2018

What the P2159 code means?

The P2159 diagnostic trouble code (DTC) is an indication that there is a range/performance issue with the vehicle speed sensor B The vehicle speed sensor B reads the wheel speed sensor for the anti-lock brake system (ABS). There are several components that are impacted by the operation of the vehicle speed sensor. If this sensor is not operating properly, the transmission shift, engine driveability, and cruise control system may all be affected by this malfunction.

What causes the P2159 code?

1. The Vehicle Speed Sensor (VSS) "B" is not reading (functioning) properly
2. There is a broken/frayed wire leading to the vehicle speed sensor
3. The vehicle's PCM is not correctly configured for the actual tire size on the vehicle

What are the symptoms of the P2159 code?

Symptoms typically include speedometer and odometer malfunctions, erratic or harsh automatic transmission shift patterns (limp-in mode), the tachometer may behave erratically, the antilock brake or brake lamp may be illuminated, ABS braking may be deactivated, the vehicle rev limiter could operate with a lower threshold (limit RPMs to a lower figure than normal), a stored trouble code, and an illuminated service engine soon lamp.

Common mistakes when diagnosing the P2159 code:

Antilock brake sensors are frequently replaced in error when attempting to diagnose a vehicle speed sensor code. Follow manufacturer's guidelines to ensure that you are testing the correct sensor before replacing any components. If antilock brake codes are present, the related condition could be a contributing factor in this vehicle speed sensor code. Diagnose codes in the order in which they are stored. If this code is not the first code stored, suspect that it is a reaction to the conditions of another code being stored. While vehicle speed sensor replacement repairs this condition most of the time, a thorough diagnosis must be performed before condemning any component.

What repairs can fix the P2159 code?

1. Replacing a faulty vehicle speed sensor
2. Replacing faulty ABS components
3. Replacing faulty wheel bearings
4. Repairing or replacing damaged electrical components
5. Repairing or replacing vehicle speed sensor wiring that is damaged, shorted, or open
6. Repairing or replacing vehicle speed sensor connectors that are damaged, corroded, or disconnected
7. Replacing aftermarket tires and wheels with original tires and wheels
8. Replacing and reprogramming the PCM

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