Ignition Coil B Primary/Secondary Circuit Malfunction

Ignition coil 2 primary/secondary circuit fault. Swap the coil from cylinder 2 to another cylinder to confirm. If the code follows the coil, replace with an OE-quality Motorcraft unit (EcoBoost) or DG-542 (5.0L). If the code stays on cylinder 2, check the wiring from the PCM to the coil connector. Inspect for chafing where the harness routes along the engine. Confirm the exact part for your year and engine with a retailer's fitment lookup or your VIN before ordering - these applications split by engine and build date.

Coil 2 circuit malfunction. Check the connector for corrosion or damage. The 5.3L uses individual coil-on-plug ignition (ACDelco). Measure primary winding resistance (0.4-1.0 ohm). If resistance is out of spec, replace the coil. If the coil is good, check the ECM driver circuit. Swap with a known-good coil from another cylinder to verify. Confirm the exact part for your year and engine with a retailer's fitment lookup or your VIN before ordering - these applications split by engine and build date.

Coil 2 circuit fault on the Hemi. Replace the coil (Mopar) and the spark plug together. Check the coil boot for carbon tracking -- a white powder residue inside the boot indicates arcing. If the code returns, the PCM coil driver may have failed. Also check for a cracked spark plug porcelain that allows voltage to arc to ground. Confirm the exact part for your year and engine with a retailer's fitment lookup or your VIN before ordering - these applications split by engine and build date.