Cooling

Coolant circulation and temperature regulation — thermostat, water pump, radiator, fans and the temperature sensors the control module depends on. A thermostat stuck open costs fuel quietly for years; one stuck closed destroys an engine in minutes.

433 codes · 15 components · 1 live parameter

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Components

Live parameters to watch

PID	Parameter	Unit	Conversion
01:05	Engine coolant temperature Coolant temperature as the control module sees it. Check this against ambient at a genuine cold start: if it disagrees with intake air temperature after standing overnight, the sensor is drifting.	°C	A − 40

Trouble codes

Critical 3

High 67

Moderate 92

Low 15

Information, not instruction

CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.

Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.

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The car — make, model, year and engine. The same fault behaves differently on each.
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