P2159 Fault Code

Vehicle Speed Sensor B Range/Performance

• What does that mean?
• Symptoms
• Causes
• Solutions

• The Vehicle Speed Sensor B Range/Performance fault code P2159 indicates that the vehicle's computer has detected a discrepancy in the readings from the speed sensor compared to the expected performance metrics.
• This sensor plays a critical role in providing real-time speed data that is essential for various functions such as transmission shifting, anti-lock braking system, and stability control.
• Any issues leading to incorrect signals could affect vehicle performance and safety.

What are the symptoms of the P2159 code?

• Drivers may experience symptoms such as:
  • Erratic or incorrect speedometer readings.
  • Difficulty in shifting gears or transmission performance issues.
  • Activation of the check engine light on the dashboard.
  • Possible issues with vehicle stability control systems and traction control, leading to compromised vehicle handling.

What causes the P2159 code?

• Common causes for this fault code include:
  • Faulty Vehicle Speed Sensor B, which may be damaged or malfunctioning.
  • Wiring issues such as damaged, corroded, or shorted wires connected to the speed sensor.
  • Poor connections in the speed sensor circuit leading to unstable signals.
  • Problems in the engine control module (ECM) affecting sensor readings.
  • Issues with the transmission control system that could interfere with speed sensor function.

How to fix P2159?

• To resolve the P2159 fault code, consider the following actions:
  • Inspect and, if necessary, replace the Vehicle Speed Sensor B.
  • Check the associated wiring and connectors for damage, corrosion, or faulty connections and repair or replace as needed.
  • Test the vehicle's control modules to ensure proper functionality, addressing any faults found.
  • Clear the fault codes from the vehicle's computer and conduct a test drive to ensure the issue is resolved.
  • If symptoms persist, further diagnostics may be needed to identify underlying issues within the vehicle's transmission or control systems.