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.