Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer is having trouble getting the right speed information from one of the sensors that tells it how fast the car is going.
The vehicle speed sensor (VSS) B is not sending the expected range of signals to the engine control module (ECM), which affects the vehicle's speed readings.
The P2159 code indicates that the ECM has detected a problem with the voltage or signal coming from the vehicle speed sensor B. This sensor is responsible for sending data about the vehicle's speed to the ECM, and if the signal is out of the expected range, the ECM cannot accurately determine the vehicle's speed.
• Inaccurate speedometer readings
• Transmission shifting problems
• Check Engine Light illuminated
• Faulty vehicle speed sensor B
• Wiring issues or poor connection in the sensor circuit
• Malfunctioning ECM
ECM: Engine Control Module
VSS: Vehicle Speed Sensor
• Use an OBD-II scanner to confirm the P2159 code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the vehicle speed sensor B for proper operation.
• Replace the faulty vehicle speed sensor B.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$100 - $300
Moderate
• Toyota Camry
• Honda Accord
• Ford F-150
• Regularly inspect and maintain vehicle wiring.
• Ensure connectors are clean and secure.
• Perform routine diagnostic checks.
Sensor Issue
• Avoid high-speed driving until the issue is resolved.
• Consult a professional mechanic for accurate diagnostics.
Check if your vehicle's powertrain warranty covers sensor replacements.
P2159 is a relatively uncommon code but can occur in vehicles with high mileage or poor maintenance.
Moderate – While the vehicle may still be drivable, incorrect speed readings can affect transmission performance.
Driving with a malfunctioning speed sensor can lead to inaccurate speed readings, which may result in traffic violations.
• Vehicle must be in motion.
• Engine must be running.
The vehicle speed sensor B is typically located on the transmission or differential.
Q: Can I drive with a P2159 code?
A: It's possible, but not recommended due to potential transmission issues and inaccurate speed readings.
Q: How do I reset the P2159 code?
A: After repairs, use an OBD-II scanner to clear the code from the ECM.
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