P256D

Engine Idle Speed Selector Sensor/Switch Circuit High

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–56 (est.)

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

P0505 P0506 P0507