Does not start at times. have had bcm, starter, ingition switch and battery replaced. any ideas on what it could be. sometimes if i shift the shifter trough all the gears twice then into park it will start.
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Could be a number of different thing's , not just key switch ! What ,is this guy just suppose to replace every part suggested ? Knowing how the starter works , what controls it . Viewing wiring diagrams , using a DMM - digital multi-meter to test electrical circuits is how a professional technician diagnose's problems like this . Plus in the case of many vehicles from the early 2000 on have more complex starter circuits , a computer is put into the mix . Having a qualified repair shop with the proper diagnostic testing equipment is a must . You have no idea how complex these systems are , your best bet ,have it towed to the dealer or someother qualified repair shop . You would need knowledge of serial data networks , scann tool diagnostics , electrical circuits trouble shooting , factory service repair info. etc....
Circuit Description (Key Start)
For ignition switch power modes refer to Body Control System Description and Operation . When the ignition switch is placed in the Start position a discrete signal is supplied to the body control module (BCM) notifying it that the ignition is in the Start position. The BCM then sends a message to the engine control module (ECM) notifying it that CRANK has been requested. At the same time the BCM is supplying 12 volts for the IGN 1 relay closing it and supplying battery positive voltage for the crank relay coil. The ECM verifies that the transmission is in Park or Neutral. If it is, the ECM grounds the control circuit of the crank relay. When this occurs battery positive voltage is supplied through the switch side of the crank relay to the S terminal of the starter solenoid.
Sounds like a "dead spot" in the starter solenoid. Not sure if you will have to replace the entire starter assembly or just the solenoid. Some GM starters have a solenoid that can't be replaced seperatly.
A trip or call to your local parts store (O'Reilly's / Advance Auto) might be helpful.. explain your problem and see what they think.
i used to work as a GM mechanic for years, and we had quite a few complaints like yours, GM issued a computer reprogram to resolve most issues with starting, i would contact your local dealer and have them check for open campaigns or bulletins for your car if there is one they will do it at no cost to you.
sounds like your ignition switch. NOT the key switch, the igintion switch. It works off the key cylinder to allow or not allow power to your components. Like radio, gagues, starter, ignition, wipers etc. If the switch is going bad, you may have power to some or none of those components with key in on position.