DTC P1281: Engine Is Cold Too Long: Testing

NOTE: This test works best if performed on a cold engine (cold soak). Extremely cold outside ambient temperatures may cause this DTC to set. Verify that the coolant level is correct. If not, repair as necessary. Ensure the Engine Coolant Temperature (ECT) sensor is operating correctly.

Turn the ignition on. With the DRBIII(R), monitor the Engine Coolant Temperature value during the warm-up cycle. Ensure the transition of the temperature change is smooth. Did the engine temperature reach a minimum of 160°F (71°C)? If yes, test is complete. If no, repair cooling system as necessary. The most probable cause is a thermostat problem. Also, check for any related Technical Service Bulletin (TSB) that may apply.