P1304

What does P1304 mean?

P-code P1304 means "Cylinder Head Overtemperature Protection Active". It is a manufacturer-specific diagnostic trouble code (DTC) in the HVAC / climate control. An abnormal temperature condition has been detected in the cylinder head overtemperature protection active — the system may be overheating or running too cold. This code can be monitored, but service is recommended to prevent escalation. This code applies to OBD-II compliant electric and hybrid vehicles.

Possible Causes

• Cooling system failure (low coolant, blocked radiator, or pump failure)
• Ambient temperature extremes affecting sensor calibration
• Faulty temperature sensor providing inaccurate readings
• Thermal management system component failure

Recommended Actions

1. 1 Note the alert and schedule a diagnostic appointment when convenient
2. 2 Scan for all DTCs with an OBD-II scanner — note any related codes stored alongside P1304
3. 3 Check coolant level, coolant flow, and cooling fan operation
4. 4 Inspect the temperature sensor and its wiring for damage or corrosion
5. 5 Clear the DTC, road-test the vehicle, and re-scan to confirm whether the fault returns
6. 6 If the fault persists after inspection and clearing, consult an EV-certified technician for component replacement

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