P256D
Engine Idle Speed Selector Sensor/Switch Circuit High
P256D is an OBD-II diagnostic trouble code meaning: Engine Idle Speed Selector Sensor/Switch Circuit High. Common causes: idle speed sensor malfunction, open or short circuit in the sensor circuit. Estimated repair cost: $17–56.
Symptoms
- Unstable idle speed
- Floating engine speed
- Difficulty starting the engine
- Increased fuel consumption
- Check Engine Light Is On
Causes
- Idle speed sensor malfunction
- Open or short circuit in the sensor circuit
- Poor contact in the sensor connector
- Wiring harness damage
- Engine ECU malfunction
How to Fix
- Check the condition of the idle speed sensor
- Check the integrity of wiring and connectors
- Measure the resistance and voltage in the sensor circuit
- If necessary, replace the idle speed sensor
- Check and reflash the ECU if necessary
Related codes
Error P256D by Vehicle Brand
FAQ
What does the P256D code mean?
P256D is an OBD-II diagnostic trouble code that indicates: Engine Idle Speed Selector Sensor/Switch Circuit High
What causes a P256D error code?
The most common causes of P256D include: Idle speed sensor malfunction; Open or short circuit in the sensor circuit; Poor contact in the sensor connector; Wiring harness damage.
How do I fix a P256D diagnostic trouble code?
To fix P256D: Check the condition of the idle speed sensor. Check the integrity of wiring and connectors. Measure the resistance and voltage in the sensor circuit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P256D?
Yes, but get it checked soon
How much does it cost to fix P256D?
The estimated repair cost for P256D is $17–56. Actual cost depends on your vehicle, location, and labor rates.
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