Chrysler / Dodge / Eagle / Plymouth BCM

Important: Use this guide if you reinstalled your repaired (Chrysler/Dodge/Eagle/Plymouth BCM) and the problem is still happening.

• Step 1: Confirm the exact symptom
  • Dash cluster failure (no speedometer/gauges), door locks not working, intermittent power issues, malfunctioning headlights, and/or no communication with BCM
  • Note if the issue is constant or intermittent (only when cold, after bumps, after rain, etc.)
• Step 2: Verify battery voltage and battery connections
  • Low voltage or loose/corroded battery connections can cause multiple body/electrical issues
  • Confirm battery terminals are clean/tight and grounds are secure
• Step 3: Check related fuses first
  • Check fuses for BCM/body, cluster, headlamps/lighting, and door locks
  • If a fuse is blown, replace it once and re-test
  • If it blows again, stop—inspect wiring and the affected circuit/component for a short
• Step 4: Perform a full vehicle scan (if available)
  • Scan all modules and record any BCM/network/communication codes
  • Clear codes and see what returns immediately
  • If the BCM does not communicate, go to Step 5–7
• Step 5: Verify BCM power and ground
  • Confirm constant battery power feeds and ignition feeds (key on) to the BCM
  • Confirm grounds are solid under load (weak grounds can cause no-comm and random electrical faults)
• Step 6: Inspect and reseat BCM connectors
  • Inspect for corrosion/green pins, moisture, bent/pushed-out pins, loose terminals, or heat damage
  • Reseat connectors fully and confirm locking tabs are engaged
  • If symptoms change when moving the harness, suspect terminal tension/connector fitment
• Step 7: Check for water intrusion and corrosion sources
  • These vehicles commonly have issues from moisture near fuse/BCM areas
  • Inspect surrounding harness/connector areas for signs of water tracks or corrosion
• Step 8: Symptom-specific checks
  • Dash cluster dead/no gauges
    • Confirm cluster fuses are good
    • Inspect the cluster connector and dash ground points
    • If the cluster powers on sometimes, suspect loose connector/ground before module failure
  • Door locks inoperative
    • If only one door fails, inspect that door actuator and door-jamb wiring first
    • If all doors fail, focus on BCM power/ground and lock fuses/relays
  • Headlights malfunctioning
    • Inspect headlamp connectors for heat damage/corrosion
    • Check for rubbed-through wiring near the front harness
  • Intermittent power issues
    • Inspect main grounds and any body grounds for looseness/corrosion
    • Inspect fuse box terminals for poor contact
• Step 9: Check for recent work that could have triggered it
  • If the issue started after battery replacement, fuse work, stereo/remote-start/alarm work, or body repairs
  • Re-check any splices, grounds, and connectors that may have been disturbed
• Step 10: Re-test and re-scan
  • Re-test locks/lights/cluster operation multiple cycles
  • Re-scan and note any codes that return immediately vs. only after operating the affected functions
• If the issue is still present
  • Call or email UpFix for the fastest help, especially if the issue happens immediately after install