P1281 - Engine Is Cold Too Long

The Technical Definition: The computer detects that the engine is not reaching its optimal operating temperature within the expected amount of time.

Common Symptoms: The temperature gauge stays low, the heater might not blow fully hot air, and fuel efficiency drops.

Typical Fix: Similar to the P0128 code, the thermostat is likely stuck open. Replacing the thermostat housing assembly and ensuring the cooling system has the correct fluid usually resolves this.