Engine Over Temperature
What it means
This is a Nissan-specific code; the same number can mean something different on other makes. It means the engine computer detected an abnormally high coolant temperature, most often from a radiator fan fault, low coolant or a failed cooling system part. This is a serious code; continuing to drive can damage the head gasket or the engine itself.
Models covered: Nissan models, mainly around 1998–2008.
Symptoms5
- Temperature gauge high or in the red zone.
- Steam or a coolant smell from the front of the car.
- The radiator fan does not run when the engine is hot or the A/C is on.
- Weak A/C performance with rising temperature in traffic.
- Coolant level dropping repeatedly.
Possible causes7
- The radiator fan not running due to the fan motor, relay, fuse or wiring.
- Low coolant from a leaking hose, radiator or water pump.
- A radiator cap that does not hold pressure.
- A thermostat stuck closed.
- A radiator clogged internally or blocked by dirt outside.
- A weak or leaking water pump.
- A failed head gasket pushing gases into the cooling system (less common).
How to diagnose5
- Turn off the engine and let it cool fully before opening the radiator cap or reservoir, to avoid burns.
- Check the coolant level and look for leaks under the car and around hoses and the radiator.
- Run the engine and check that the fan comes on when hot and with the A/C on; test the relay, fuse and fan motor.
- Read coolant temperature on a scan tool and compare with the gauge to confirm the sensor is accurate.
- Pressure-test the radiator cap and cooling system, and test for exhaust gases in the coolant if it keeps dropping.
How to fix6
- Top up with the correct coolant once the engine is cool, and fix the leak.
- Replace the fan fuse or relay, or repair the wiring.
- Replace the fan motor if confirmed faulty.
- Replace a faulty thermostat or radiator cap.
- Clean or replace the radiator, replace a weak or leaking water pump, and repair the head gasket if confirmed damaged.
- Clear the codes, run the engine until the fan cycles, then drive in traffic and confirm the temperature stays stable.
Repair cost
In Saudi riyals; the highlighted part is the expected range for this fault.
The cost is low when a relay, fuse or small coolant top-up is the fix, and rises with a fan motor, radiator or water pump; it can far exceed the range if the head gasket was damaged by driving while overheated.
Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.
Prices last updated: September 2026
Frequently asked questions
Can I keep driving to the workshop?
It is not recommended. Pull over safely and turn off the engine; driving while overheated can ruin the head gasket or engine at far more cost than a tow.
Why does it only overheat in traffic?
At speed, air through the radiator is enough to cool it; when stopped, cooling depends on the fan. If the fan does not run, the temperature climbs, which points to the fan or its relay.
Can I add water instead of coolant?
Only in an emergency for a short distance. Then drain and refill with the proper coolant, because water alone causes rust and boils sooner.
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This guide is for information only and does not replace an inspection by a qualified technician. If the fault involves brakes, steering, engine temperature, electrics or refrigerant, do not attempt the repair yourself.
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