Set Condition

WARNING: This page is about a different car, the 1995 Pontiac Bonneville, 1995 Oldsmobile Eighty-Eight, and 1995 Buick LeSabre. However, it is still accessible from the selected car via links, so may be relevant.

Code P1257 will set when the following conditions are present.

Intake air temperature is greater than 0°F (-18°C).
Boost duty cycle less than 100 percent.
Engine torque exceeds a calibrated maximum torque value. This value varies depending on commanded gear and engine RPM.
Conditions exist for at least 6 seconds.