Usually the valvetrain when oil is low.
The 2002 GMC Sierra-2500HD has a V8 engine.
The 2002 GMC Sierra-1500 has a V6 engine.
The 2002 GMC Sierra-2500HD has a 6.0 L base engine size.
The 2002 GMC Sierra-1500 has a 4.3 L base engine size.
The 2002 GMC Sierra-2500HD's engine produces 300 hp @ 4400 rpm.
The 2002 GMC Sierra-2500HD's engine produces 360 ft-lbs. @ 4000 rpm.
The 2002 GMC Sierra-1500's engine produces 200 hp @ 4600 rpm.
The 2002 GMC Sierra-1500's engine produces 260 ft-lbs. @ 2800 rpm.
The 2002 GMC Sierra: temperature sensor is located on the front of the engine. The sensor will be just above the thermostat housing.
the ticking noise is a small exhaust leak close to the exhaust headers or exhaust pipe near the engine.
The 2002 GMC Sierra-2500HD has 16 valves.
The 2002 GMC Sierra-1500 has 12 valves.