The oil pressure gauge may be fluctuating on a 2006 GMC Sierra if the oil pump is failing or the sensor is defective. This can be the first indicator of a potentially catastrophic failure.
At top rear of the engine, just beside the distributor.
step one,is your oil pressure at 80 psi ? or is the gauge tellin you it is? step two,diagnose the problem.
The 2006 GMC Sierra-1500 has 12 valves.
The 2006 GMC Sierra-2500HD has a V8 engine.
The 2006 GMC Sierra-2500HD has 16 valves.
The 2006 GMC Sierra-2500HD has overhead valves (OHV).
The 2006 GMC Sierra-1500 has overhead valves (OHV).
The 2006 GMC Sierra-2500HD has a 5-speed manual.
The 2006 GMC Sierra-2500HD is a gas-powered vehicle.
The 2006 GMC Sierra-1500 has a 5-speed manual.
The 2006 GMC Sierra-1500 is a gas-powered vehicle.
Either your temperature gauge is reading too hot , your oil pressure is too low , or your gas gauge is at or near empty