P256C

Engine Idle Speed Selector Sensor/Switch Circuit Low

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–67 (est.)

Symptoms

Unstable idle speed
Engine stalling at idle
Check Engine Light Illuminates
Reduced engine power
Problems starting the engine

Causes

Faulty idle speed selection sensor
Open or short circuit in the sensor circuit
Poor contacts or corrosion in connectors
Problems with the engine ECU
Faulty relay or fuse

How to Fix

Check sensor voltage and resistance to specifications
Inspect the wiring harness and connectors for damage.
Check fuses and relays associated with the sensor circuit
Replace the faulty sensor if necessary
Reflash the ECU if there are no hardware faults

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