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OBD-II Trouble Shooting Got a code reader? Find out what your GM car's Check Engine light is trying to tell you (and then turn Check Engine light off).

 
 
 
 
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Old 09-26-2009, 02:42 PM   #1
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Default P1257

P1257

Description
SUPERCHARGER SYSTEM OVERBOOST

Normally PCM commands Boost Control (BC) solenoid to operate
at 100 percent (ON) Pulse Width Modulation (PWM) to allow for full
intake boost upon demand. If Reverse is selected, PCM detects rapid
deceleration, or engine is load is extremely high, PCM commands BC
solenoid to operate at zero percent (OFF) PWM.

Symptoms
You likely won't notice any drivability problems.

Causes

  • Engine torque exceeds maximum predetermined torque threshold
    value.
Solutions
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