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PO128 refers to the thermostat not operating properly. You could replace the thermostat with a good quality one such as Stant. The computer will have to be cleared. If the code does come back then you need to have a repair shop check it out for you.
Code PO128 is engine temperature below specs. You can try changing the thermostat and have the code cleared. If that does not work then you need to pay a shop to further diagnosis it. jd
What else can I help you with?
How do you program the bcm on a 2001 Chevrolet Impala?
You don't, the dealer or repair shop does.
What size engine does the 2001 Chevrolet Impala have?
The 2001 Chevrolet Impala has a V6 engine.
How many valves does the 2001 Chevrolet Impala have?
The 2001 Chevrolet Impala has 12 valves.
What is the cam type of the 2001 Chevrolet Impala?
The 2001 Chevrolet Impala has overhead valves (OHV).
Is the 2001 Chevrolet Impala electric or gas?
The 2001 Chevrolet Impala is a gas-powered vehicle.
What kind of transmission does the 2001 Chevrolet Impala have?
The 2001 Chevrolet Impala has a 4-speed automatic.
What is the turning circle of the 2001 Chevrolet Impala?
The 2001 Chevrolet Impala's turning circle is 38 ft..
How tall is the 2001 Chevrolet Impala?
The height of the 2001 Chevrolet Impala is 4 ft. 9.3 in. (57.3 in.).
How long is the 2001 Chevrolet Impala?
The 2001 Chevrolet Impala is 16 ft. 8 in. (200 in.) long.
What kind of fuel does the 2001 Chevrolet Impala use?
The 2001 Chevrolet Impala runs on regular unleaded.
What is the front leg room in the 2001 Chevrolet Impala?
The 2001 Chevrolet Impala has 42.2 in. of front leg room.
What is the rear hip room of the 2001 Chevrolet Impala?
The 2001 Chevrolet Impala has 55.7 in. of rear hip room.
