Thread: PO128 Code

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  1. #1 PO128 Code 
    quickster
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    Default 01-04-2012
    '04 Grand Prix 3800 Series 3. I have a PO128 code. Should I be looking to replace the thermostat or the engine coolant temperature sensor? I checked, and the coolant level in the reservoir is ok. The gauge needle sits on the 1/4 mark when the engine is warmed up.
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  2. #2 Re: PO128 Code 
    Explicit_Spade
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    Default 01-04-2012
    Thermostats are under $10, and if it's stuck open, it would prevent the car from warming up, so I would start there.
    Quote Originally Posted by W-Body Store
    Remember, GM engineers didn't take into account your need for speed.
    Daily Driver: 06 Grand Prix GT / 9.4:1 CR / IS3 Heads / Ported Gen V / ZZP Headers / HPT Pro / Pulleys: 4.25, 3.8, 3.5, 3.4, 3.2, 3.0, 2.9, 2.7
    Projects: 86 Monte Carlo SS / 98 Sonoma / 74 Honda CB750
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  3. #3 Re: PO128 Code 
    danielle15
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    Default 01-04-2012
    OBD-II Trouble Code: P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
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  4. #4 Re: PO128 Code 
    quickster
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    Default 01-04-2012
    Thank you both.
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