P2317 and P0306 Fault Diagnosis - 2013 Jeep Grand Cherokee 5.7L HEMI

I own a 2013 Jeep Grand Cherokee with the 5.7L HEMI engine. After extensive mechanical work—including replacing the camshaft, lifters, pushrods, valve springs, oil pump, timing chain, belt, tensioner and idler pulleys, ignition coils, spark plugs, intake manifold, CAI, and hood—I recently started receiving two persistent OBD2 diagnostic codes: - P2317: Ignition Coil F Secondary Circuit Fault - P0306: Cylinder 6 Misfire Detected I performed coil swaps between cylinders 6, 4, and 2; also swapped plugs among those cylinders. The codes persist immediately after startup, with P0306 appearing after a few minutes of driving. I replaced both the crankshaft and camshaft position sensors. This introduced new faults: primary circuit fault on the crank sensor and random misfire codes. When I reinstalled the OEM crankshaft sensor, only the original two codes (P2317 and P0306) returned. Later, a camshaft position sensor code appeared—after reinstalling the OEM cam sensor, the issue reverted to just P2317 and P0306. Last night, I conducted several tests using a digital multimeter (DMM): - Removed PCM connectors and tested continuity between PCM and Coil F/6 — continuity present. - Measured resistance between PCM and Coil F connector — 0.3 ohms (wire is intact). - Checked for short to ground — infinite resistance (no grounding issue). - Reconnected the PCM connector and measured resistance to ground on Coil F — ~3 MOhms, indicating a possible short to ground in the driver circuit. For reference: - All other coils (B, D, H, A, C, E, G) showed ~11 MOhms to ground—significantly higher than expected but still not infinite. This suggests potential issues with coil drivers or wiring harnesses. Today, I disconnected Coil F and attempted to start the vehicle. The signal observed was between 200Hz and 300Hz initially, then dropped into the kHz range during the first minute. DC voltage readings were extremely low—approximately 0.003V (within meter variance), suggesting no measurable DC signal. Given these results, I suspect that the coil driver circuits may be failing across multiple coils. However, the persistent P2317 and P0306 codes point to a deeper issue involving either the PCM, wiring harness, or faulty ignition module. Any insights or suggestions on diagnosing this specific failure pattern in a 5.7L HEMI-equipped Jeep Grand Cherokee? Thanks for your help! — Mike