P256A
Engine Idle Speed Selector Sensor/Switch Circuit/Open
P256A is an OBD-II diagnostic trouble code meaning: Engine Idle Speed Selector Sensor/Switch Circuit/Open. Common causes: broken wires in the sensor circuit, idle speed sensor/switch malfunction. Estimated repair cost: $17–56.
Symptoms
- Unstable idle speed
- Spontaneous change in engine speed
- Stalls at idle
- Check Engine light comes on
- Increased or decreased idle speed
Causes
- Broken wires in the sensor circuit
- Idle speed sensor/switch malfunction
- Poor contact in the sensor connector
- Short circuit to ground or power
- Malfunction of the engine control unit (rare)
How to Fix
- Check the integrity of the sensor wires and connectors
- Check sensor resistance (compare with factory specifications)
- Check the presence of power and ground at the sensor connector
- Replace idle speed sensor if necessary
- Reflash or replace the ECU if it malfunctions (extremely rare)
Related codes
Error P256A by Vehicle Brand
FAQ
What does the P256A code mean?
P256A is an OBD-II diagnostic trouble code that indicates: Engine Idle Speed Selector Sensor/Switch Circuit/Open
What causes a P256A error code?
The most common causes of P256A include: Broken wires in the sensor circuit; Idle speed sensor/switch malfunction; Poor contact in the sensor connector; Short circuit to ground or power.
How do I fix a P256A diagnostic trouble code?
To fix P256A: Check the integrity of the sensor wires and connectors. Check sensor resistance (compare with factory specifications). Check the presence of power and ground at the sensor connector. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P256A?
Yes, but get it checked soon
How much does it cost to fix P256A?
The estimated repair cost for P256A is $17–56. Actual cost depends on your vehicle, location, and labor rates.
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