P0128 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

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 09-24-2009, 03:34 PM   #1
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Default P0128


Coolant Temperature Below Thermostat Regulating Temperature

Your engine has not reached its operating temperature in the correct time.

You will likely not notice any drivability problems other than the SES light.

  • Low engine coolant level
  • Leaking or stuck open thermostat
  • Cooling fan (running too much)On all the time
  • Defective coolant temperature (ECT) sensor
  • Defective intake air temperature (IAT) sensor
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