Circuit/System Verification

Ignition ON.
Verify that no ignition, starter pinion solenoid actuator relay, starter motor relay , brake pedal position sensor, immobilizer, engine, or automatic transmission DTCs are set that would cause the ECM to disable engine starting.
- If DTCs are set
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- If no DTCs are set
Verify the scan tool BCM 5 V Ignition Switch (vehicles without push button start) or ECM Power Mode (vehicles with push button start) parameter is Crank Request while attempting to start the vehicle.
- If parameter does not display Crank Request
  Refer to Vehicle Will Not Change Power Mode
- If parameter displays Crank Request
Verify the scan tool TCM Internal Mode Switch parameter displays Park with the transmission range selector in park.
- If the TCM Internal Mode Switch parameter does not indicate Park
  Refer to Transmission Internal Mode Switch Logic for the M2D Transmission.
- If the TCM Internal Mode Switch parameter indicates Park
Verify the scan tool ECM Crankshaft Position Active Counter parameter is not incrementing.
- If the counter increments
  Replace the B26 Crankshaft Position Sensor.
- If the counter does not increment
Verify the crank relay clicks and the engine begins cranking with the ignition in the Crank position.
- If the KR27C Starter Pinion Solenoid Actuator Relay does not click
  Refer to Circuit/System Testing.
- If the KR27C Starter Pinion Solenoid Actuator Relay clicks
All OK.