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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.
Sorry but your best bet would be to take it to a qualified repair shop ! Or the Chevy dealer . Could have DTC'S - diagnostic trouble codes stored in the BCM !
DTC P0615 Starter Relay Control Circuit
Ignition ON, verify that no starter relay, theft deterrent, or automatic transmission DTCs are set that would cause the ECM to disable starting.
? If DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
Ignition ON, observe the scan tool BCM Starter Switch parameter. Place ignition switch in the crank position, the parameter should display ON.
? If not the specified value, refer to Power Mode Mismatch .
Transmission range selector in park , verify the scan tool ECM PNP Switch and TCM IMS parameters display Park/Neutral.
? If the TCM IMS parameter does not indicate Park/Neutral, refer to Transmission Internal Mode Switch Logic .
? If the ECM Park/Neutral parameter does not indicate Park/Neutral, refer to ECM Park Switch Circuit Malfunction.
Transmission range selector in park or neutral, attempt to start the vehicle. The starter relay should click and the engine should begin cranking.
? If the starter relay does not click or the engine does not crank, refer to Starter Relay Circuit Malfunction.
Power to many of this vehicle's circuits are controlled by the module that is designated the Power Mode Master (PMM). This vehicle's PMM is the Body Control Module (BCM). The PMM controls which power mode (Run, Accessory, Crank, Retained Accessory Power, or Off) is active.
Serial Data Power Mode
On vehicles that have several control modules connected by serial data circuits, one module is the power mode master (PMM). On this vehicle, the PMM is the body control module (BCM). The PMM receives 3 discrete ignition switch signals to differentiate which power mode will be sent over the Serial Data circuits. The table below illustrates the state of these inputs in correspondence to the ignition switch position:
Bypassing the neutral safety switch won't help with the transmission problem. That switch is only wired into the start circuit.
Scan the computer for trouble codes. Has to be a code if it is in limp-in mode.
there is a limp mode but I doubt if that is the problem
It indicates that the torque converter clutch servo/solenoid is faulty
run the fault codes to confirm if that is it or a faulty TCM
check wiring around the transmission
Shift it into neutral and try. If it starts, the neutral safety switch needs to be adjusted. Some have made a starter bypass mode using a relay feeding the started directly from the battery. Check out Subaru-svx.net
it is your neutral safety switch, no car since the dawn of time will start if it thinks it might be in gear. try putting it in neutral instead of park as a short term fix, but you should get the neutral safety switch replaced, it takes about 45 min for your dealership to do. the car being a 2008, the dealer will probably do this under your new car warranty.
Yes it can, just place your Transfer Case in Neutral position.
Shifting into NEUTRAL To shift the transfer case to NEUTRAL do the following:
Make sure the vehicle is parked so that it will not roll. Set the parking brake. Start the vehicle or turn the ignition to RUN. Connect the vehicle to the towing vehicle. Put the transmission in NEUTRAL (N). Shift the transfer case to 2HI. Simultaneously press and hold the 2HI and 4LO buttons for 10 seconds. The red NEUTRAL light will come on when the transfer case shift to NEUTRAL is complete. Shift the transmission to REVERSE (R) for one second, then shift the transmission to DRIVE (D) for one second, or FIRST (1) for vehicles equipped with a manual transmission. Turn the ignition to LOCK. Place the transmission shift lever in PARK (P), or FIRST (1) for vehicles with a manual transmission. Release the parking brake prior to towing. Shifting Out of NEUTRAL To shift out of NEUTRAL:
Set the parking brake and apply the regular brake pedal. Shift the transmission to NEUTRAL (N) and turn the ignition to RUN with the engine off. Press the button for the desired transfer case shift position (2HI, 4HI, AUTO 4WD or 4LO). After the transfer case has shifted out of NEUTRAL the red light will go out. Release the parking brake. You may start the engine and shift the transmission to the desired position. Excessively shifting the transfer case into or out of the different modes may cause the transfer case to enter the shift protection mode. This will protect the transfer case from possible damage and will only allow the transfer case to respond to one shift per 10 seconds. The transfer case may stay in this mode for up to three minutes. NEUTRAL: Shift the vehicle's transfer case to NEUTRAL only when towing your vehicle. Good luck and hope this answers your question.