GMC P15 service by top-rated mechanics at the convenience of your home or office

I would start by having the battery charged and tested. More than likely, however, the battery will require replacement since the vehicle has been sitting for years. There is no reason to assume the starter went bad just from sitting....

Usually there will only be one crankshaft position sensor. However, there is also a camshaft position sensor as well. It is more likely that there is multiple cam sensors than crank sensors. It is possible for engines to have anywhere...

It is very possible that moisture is getting into the connectors of the engine control module (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-engine-control-module-ecm). The connectors should be checked and cleaned if necessary. Di-electric grease can be used to help seal the connectors and keep the moisture...

If the car is still overheating, even after filling the coolant system (and making sure there is no trapped air, which itself will cause overheating) just request an overheating diagnostic (https://www.yourmechanic.com/services/car-is-overheating-inspection) during which a certified mechanic will determine which of...