According to AutoZone ODB II readout: Definition Coolant temp is always low. Explanation The powertrain control module verifies that the engine is at a proper operationg temperature. Probable causes 1. Check coolant level 2. Thermostat defective 3. ECT (Engine Coolant Temperature) sensor defective. In my case it was low coolant caused by defective radiator cap. New cap and one gallon of coolant did the trick for less than $20. Mike-Ro
Trouble code P0128 means: ECT Sensor Below Thermostat Regulating Temperature
The factory code for your 1997 Pontiac Grand Prix is 152 159. The unlock code for the radio is 0229.
Trouble code P0128 means: ECT Sensor Below Thermostat Regulating Temperature
2006 Pontiac grand prix recurring number 4 cylinder misfire diagnostic code? What could it be?
Trouble code P0128 means:Coolant thermostat (coolant temp below thermostat regulating temp)
You can find the paint code inside trunk, under the carpet.
P0401 = Insufficient EGR Flow
Trouble code P0108 means:MAP Sensor Circuit High Input
Coolant Temp below thermostat regulating temp.
Trouble code P1639 means: 5-Volt Reference (B Or 2) Circuit
Trouble code P0449 means: EVAP Vent Solenoid Control Circuit Malfunction
Trouble code C1287 means: Steering Sensor Rate Malfunction