Conditions for Clearing the MIL/DTC

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

The PCM/ECM will turn the MIL OFF after three consecutive trips that the diagnostic has been run and passed.
The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
The DTC can be cleared by using the scan tool Clear DTC Information function.

DTC P1258

Step	Action	Yes	No
Connector End View Reference: Cooling System Connector End Views
1	Did you perform the Diagnostic System Check - Engine Cooling ?	Go to Step 2	Go to Diagnostic System Check - Engine Cooling
2	Check the engine cooling fans for proper operation. Are the engine cooling fans operative?	Go to Engine Overheating	Go to Symptoms - Engine Cooling