What this code means

The ECT sensor reading is not changing appropriately as the engine warms up.

Symptoms

• Check Engine Light
• Poor fuel economy
• Overheating concern
• Fan issues

Common causes

• Stuck thermostat
• Faulty ECT sensor
• Air pocket in cooling system
• Low coolant

Diagnostic steps

1. Monitor ECT warmup curve
2. Test thermostat
3. Check for air in system
4. Test sensor

Repair notes

Replace thermostat or ECT sensor. Bleed cooling system.

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