Possible causes include:
* Faulty thermostat: This is the most common cause. A stuck-closed thermostat prevents coolant from circulating properly, hindering the engine from warming up.
* Coolant leak: A leak in the cooling system reduces the amount of coolant, making it harder to reach operating temperature.
* Faulty coolant temperature sensor (CTS): A malfunctioning sensor might be giving inaccurate readings to the engine control module (ECM), leading to the code.
* Water pump issues: A failing water pump may not circulate coolant effectively.
* Low coolant level: Simply having low coolant will prevent the engine from warming up properly.
* Wiring or connector problems: Issues with the wiring or connector to the CTS can also cause this code.
* Faulty radiator: A clogged or damaged radiator can impair cooling system efficiency.
It's crucial to have a qualified mechanic diagnose the specific cause of the P0125 code in your Dodge Grand Caravan. Simply replacing the thermostat might fix the problem, but ignoring other potential issues could lead to more serious engine damage.
