Your Pontiac Gto engine control system detects a problem, the computer stores the diagnostic trouble
code P3221 in its memory.
To figure out what is wrong with your vehicle you must first extract the P3221 DTC For Pontiac Gto.
Another consequence of P3221 Pontiac Gto engine overheating may be a blown head gasket. Heat makes aluminum swell almost three times faster than cast iron. Thermal stress can distort the head and make it swell in areas that are hottest like those between exhaust valves in adjoining cylinders, and areas that have restricted coolant flow like the narrow area that separates the cylinders. The typical aluminum head swells most in the middle, which can crush the head gasket if the head gets too hot. This will usually cause the head gasket to leak compression between adjacent cylinders, or leak coolant into the cylinders.
P3221 Pontiac Gto DTC Meaning
Powertrain Code - Problem is related engine, transmission and emissions systems.
SAE - Generic
Computer And Auxiliary Outputs
Cruise Control Servo Indicates Low
PCM Stack Overrun
The original multi-displacement system turned off opposite pairs of cylinders, allowing the engine to have three different configurations and displacements. P3221 Pontiac Gto code had an elaborate diagnostics procedure, including showing engine trouble codes on the air conditionning display. However, the system was troublesome, misunderstood by customers, and a rash of unpredictable failures led to the technology being quickly retired.