GM Service Manual Online
For 1990-2009 cars only

Circuit Description

The powertrain control module (PCM) uses the engine coolant temperature (ECT) sensor to monitor the engine for an over temperature condition. When an over temperature condition is present, DTC P1258 will set.

Conditions for Running the DTC

    • A P1258 fault is enabled.
    • The PCM has performed the coolant temperature check.

Conditions for Setting the DTC

The PCM has disabled the fuel injectors.

Step

Action

Yes

No

1

Was the Diagnostic System Check for Engine Cooling performed?

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