What are the common causes of P050C?

A failed engine coolant temperature sensor. A stuck open thermostat. Low coolant level. Corrosion at the coolant temperature sensor connector.

Compare the coolant temperature reading to ambient on a cold engine. Check the coolant level. Test the thermostat for a stuck open condition. Replace the coolant temperature sensor if it reads wrong when cold. Clear the code and retest.

P050C

Cold Start Engine Coolant Temperature Performance

System: Speed and idle control (P code)
Lamp: Check Engine Light
Category: Powertrain - Computer and Auxiliary Controls

What it means

P050C means Cold Start Engine Coolant Temperature Performance.

Check these first

A failed engine coolant temperature sensor
A stuck open thermostat
Low coolant level
Corrosion at the coolant temperature sensor connector

What to do next

Compare the coolant temperature reading to ambient on a cold engine
Check the coolant level
Test the thermostat for a stuck open condition
Replace the coolant temperature sensor if it reads wrong when cold
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.