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DTC P1281: Engine Is Cold Too Long: Testing

NOTE: The best way to diagnose this DTC is to allow the vehicle to remain outside overnight in order to have a completely cold soaked engine.

Verify that the coolant level is not low and correct as necessary. Start the engine. With the DRBIII®, set the engine RPM to 1500 and allow the engine to warm up for 10-15 minutes. With the DRBIII®, monitor the ENG COOLANT TMP DEG value during the warm up cycle. Make sure the transition of temperature change is smooth. Did the engine temperature reach a minimum of 176°F (80°C)? If yes, test is complete. If no, check thermostat and cooling system for probable causes. Also refer to any related Technical Service Bulletins (TSB). Repair as necessary.

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