Service the engine.. change oil ,filter plugs etc
did you clear the faults before each read
Diagnose Buick 3800 Engine
unusual code that
P0125 is the OBD-II generic code for the engine computer, or Engine Control Module (ECM), not detecting enough heat in the cooling system before the fuel management system can take control. The ECM has a predetermined value after you start your vehicle to expect a certain coolant temperature
P0125 OBD II Trouble Code Insufficient Coolant Temperature for Closed Loop...
ecm runs the engine cooling fans
3800V6 engine over heating and heater produces cold air
try these
EGR vale not working
overheating
inlet manifold gasket leaking
water pump fins corroded
soft radiator hoses
try a new radiator cap
internal heating
heater control tap stuck
directional actuator flaps stuck
SOURCE: insufficient coolant temperature for closed
A code P0125 may mean that one or more of the following has happened:
The simplest thing to do is to reset the code and see if it comes back.
If the code comes back, the problem is likely going to be the result of the
above causes (faulty thermostat, faulty ECT sensor, or a low coolant level) theres your answer need more help just tell me
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