Jeep will not start I have 2 codes P 0320 and P.

SYMPTOM
P0320-NO CRANK REFERENCE SIGNAL AT PCM

WHEN MONITORED
With the ignition ON.

SET CONDITION
No signal from the crankshaft position sensor is present during engine cranking, and at least 3 camshaft position sensor signals have occurred.

POSSIBLE CAUSES

CAM position sensor signal
Checking intermittent CKP signal with LAB scope
5 volt supply circuit shorted to ground
5 volt supply circuit open
5 volt supply circuit shorted to voltage
CKP sensor signal circuit shorted ground
CKP sensor signal circuit open
CKP sensor signal circuit shorted to voltage
CKP sensor signal shorted to 5 volt supply circuit
Crank sensor ground circuit open
PCM - 5 volt supply
PCM - CKP sensor signal
Crankshaft position sensor

SYMPTOM
P1698-NO BUS MESSAGE FROM TCM

POSSIBLE CAUSES

Wiring harness intermittent problem
No bus message from TRANS
PCM PCI bus circuit open

Must follow the tree chart to determine the failure. Crank sensor is a common failure

Roy