P1257 CHEVROLET - Supercharger System Overboost
- Engine Light ON (or Service Engine Soon Warning Light)
P1257 Chevrolet DescriptionWith the engine running, the Intake Air Temperature (IAT) sensor input more than 14°F, then the Powertrain Control Module (PCM) detects that the engine torque was above a maximum threshold value (value vanes by commanded gear and rpm) for 6 seconds.
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