P0A04

Motor Electronics Coolant Temperature Sensor A Circuit Intermittent

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$6–33 (est.)

Symptoms

Unstable engine operation
Increased fuel consumption
Floating idle speed
Check Engine Light Illuminates
Incorrect temperature readings on the dashboard

Causes

Poor contact in the sensor connector
Open or short circuit in wiring harness
Coolant temperature sensor malfunction
Corrosion of contacts or connectors
Problems with the engine control unit (rare)

How to Fix

Check the integrity of the sensor wiring harness
Inspect connectors for corrosion or damage
Check the resistance of the temperature sensor at different temperatures
Replace the coolant temperature sensor if necessary
Clear contacts and restore connections

Related codes

P0115 P0116 P0117 P0118