Dodge RAM/Van PCM Repair

Dodge RAM / Van PCM Repair — Troubleshooting Guide (SKU Group)

Important: Use this guide if you reinstalled your repaired Dodge RAM/Van PCM and the problem is still happening.
Important: Please do not open/disassemble the PCM or force/probe connector pins (terminals can spread and cause new faults).

• Step 1: Confirm the PCM is the correct one
  • Match the PCM part number to the original (exact match when possible).
  • If a different PCM was installed, it may require in-vehicle programming to start/communicate.
• Step 2: Battery + main grounds (Dodge is picky here)
  • Battery fully charged and terminals tight/clean.
  • Inspect/clean engine-to-body and battery-to-body ground straps.
  • Check for loose grounds near the battery, fender, and engine block.
• Step 3: Verify PCM power feeds
  • Check all fuses labeled: PCM / ECM / ASD / IGN / FI / INJ / ENG (under-hood + interior).
  • Swap the ASD relay and ignition/run relay with a known-good matching relay.
• Step 4: Inspect PCM connectors carefully
  • Look for bent pins, pushed-out pins, moisture, corrosion, or spread terminals.
  • Re-seat connectors and make sure the latches fully lock.
• Step 5: If the issue is crank/no-start
  • Listen for fuel pump prime; verify fuel pressure if possible.
  • Check spark and injector pulse during cranking.
  • If no spark/injector pulse: focus on ASD relay control, crank sensor signal, and PCM power/ground.
• Step 6: If the issue is intermittent stall / random shutdown
  • Wiggle-test harness near the PCM and PDC/fuse box while idling (if safe).
  • Inspect harness for rub-through near the battery tray, PDC, and engine.
• Step 7: If the issue is “No Communication”
  • Confirm the scan tool powers up and the OBD-II port has power/ground.
  • If multiple modules won’t communicate, suspect a vehicle power/network issue (not the PCM).
• Step 8: If problems started after other work
  • Re-check anything recently touched: battery connections, fuse/relay seating, grounds, sensors, wiring routes.
• Step 9: When to involve a shop
  • If symptoms persist, a shop should verify PCM power/ground and ASD relay outputs at the PCM connector under load (cranking/running). Intermittent power/ground faults are the most common repeat cause.