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2007 Saturn Vue P0305 P0306 P0303 P0300 P0420 - Car Won't Start with Clicking Noise, Possible Starter or Battery Issue

Model: 2007 Saturn Vue Fault Code: P0300 Posted: 2018-08-13 22:14

My 2007 Saturn Vue is not starting and produces fast clicking noises even when connected to a battery charger. The vehicle shows multiple diagnostic trouble codes: P0305, P0306, P0303, P0300 (random misfires), and P0420 (catalyst efficiency below threshold). I'm trying to diagnose the issue myself. Could this be caused by a faulty solenoid, starter motor, or loose battery connections? Or is there a more serious underlying problem?

Related fault codes

P0300P0303P0305P0306P0420

Comments (2)

Anonymous 2018-08-15 08:34

Ensure all battery terminals and connections are clean, shiny, and securely tightened. Corrosion or loose wires can cause starting issues and contribute to misfire codes like P0305-P0306.

Anonymous 2018-08-15 11:48

Even though the battery was tested as 'good' initially, it was actually defective and couldn't hold a charge. After replacing it with a new one, the car started properly and the misfire codes cleared. This experience highlights how a weak battery can mimic starter or ignition problems in a 2007 Saturn Vue.