P256B Fault Code

Engine Idle Speed Selector Sensor/Switch Range/Performance

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

The Engine Idle Speed Selector Sensor/Switch is responsible for determining the appropriate idle speed for the engine based on various factors such as engine load and temperature. When the sensor or switch experiences a fault, it can lead to improper engine idle performance.

What are the symptoms of the P256B code?

• Engine idle speed fluctuates unexpectedly.
• Rough idling or stalling when the car is at a stop.
• Check Engine Light illuminated on the dashboard.
• Poor fuel economy due to inconsistent idle performance.

What causes the P256B code?

• Faulty engine idle speed selector sensor.
• Wiring issues or poor connections.
• Defective engine control unit (ECU).
• Mechanical problems in the throttle body or related components.

How to fix P256B?

• Inspect the engine idle speed selector sensor and wiring for any damage or loose connections.
• Replace the faulty sensor if necessary.
• Check and clean the throttle body to ensure smooth operation.
• If issues persist, consider reprogramming or replacing the ECU.