There are a number of factors to take into consideration when trying to troubleshoot your 2003 Pontiac Grand Prix that when it isn't starting. Problems can range from a bad starter to a malfunctioning fuel pump, depending on the Grand Prix's behavior when attempting to start the vehicle. Take a systematic approach when trying to diagnose why the Grand Prix isn't starting.
Jump start the vehicle and allow the engine to run for several minutes in an attempt to recharge the battery, as it is likely dead.
Remove the jumper cables from both vehicles, and shut down the engine on the Grand Prix.
Attempt to start the Grand Prix without the jumping it. If it is able to be jump started, but fails to start after shutting down the engine, the battery is most likely defective and needs to be replaced.
Check the fuel level. The most common reason that the engine will crank, but not start, is because the Grand Prix is out of gas.
Test the spark plugs using a spark tester if you find that the gas tank has enough fuel but the engine still will not crank.
Turn the key to the "On" position but do not attempt to crank the engine. Listen for the fuel pump to power up and begin to build pressure. If you are unable to hear this when turning the vehicle on, the fuel pump may be bad.
