P0A00

Motor Electronics Coolant Temperature Sensor A Circuit

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$6–28 (est.)

Symptoms

Unstable engine operation at idle
Increased fuel consumption
Engine overheating
Check Engine Light Is On
Deterioration of vehicle dynamics

Causes

Coolant temperature sensor malfunction
Open or short circuit in the sensor circuit
Poor contact in the sensor connector
Corroded contacts or damaged wiring harness
Engine control unit malfunction

How to Fix

Check sensor resistance at different temperatures
Inspect the sensor circuit for damage
Check the contacts in the sensor connector and the ECU
Replace the coolant temperature sensor if necessary
Reset the error code and check the system operation

Related codes

P0115 P0116 P0117