Chrysler / Dodge / Jeep / Maserati BCM Troubleshooting Guide

Important: Please do not open or disassemble the module. This guide is meant to rule out common vehicle-side causes first (power, ground, fuses, wiring, components).

• Step 1: Confirm the exact symptom

  • What is not working: door locks (all/driver/passenger), washer pump, trunk/liftgate/flipper-glass release

  • Confirm if the problem is constant or intermittent

• Step 2: Verify battery health and voltage stability

  • Low voltage can cause BCM faults and false symptoms

  • If the vehicle recently had a dead battery or jump start, stabilize voltage and re-test

• Step 3: Check fuses first

  • Check fuses related to BCM/fuse box, door locks, washer, and trunk/liftgate release

  • If a fuse is blown, replace it once and re-test

  • If it blows again, stop and inspect wiring and the load (actuator/pump/latch) for a short

• Step 4: Perform a full vehicle scan

  • Scan all modules (not just engine)

  • Record BCM codes and any network/communication codes

  • Clear codes and see what returns immediately

• Step 5: Confirm the BCM communicates on the scan tool

  • If you cannot connect to the BCM, focus on Steps 6–7 before anything else

• Step 6: Verify BCM power and ground

  • Verify all power feeds to the BCM (battery feeds and ignition feeds if applicable)

  • Verify grounds under load (a weak ground can test “OK” but fail when locks/pump are commanded)

• Step 7: Inspect and reseat BCM connectors

  • Inspect for corrosion/green pins, moisture, bent or pushed-out pins, loose terminals, overheated or melted connector areas

  • Reseat connectors fully and confirm latches are locked

• Step 8: Rule out single-component and wiring faults

  • If only one door lock fails, inspect that door’s actuator and door-jamb wiring first

  • If only the washer fails, verify the pump and front harness wiring are not shorted or damaged

  • If only trunk/liftgate/flipper-glass release fails, inspect hinge-area wiring and latch condition first

• Step 9: Check for aftermarket interference

  • Aftermarket alarm/remote start systems often splice into lock circuits and can mimic BCM failure

  • If possible, temporarily isolate/disable the aftermarket system for testing

• Step 10: Re-test functions from multiple inputs

  • Door locks: key fob and interior switch

  • Washer: stalk switch

  • Trunk/liftgate: button and key fob

  • Cycle each function multiple times to confirm consistency

• Step 11: Re-scan after testing

  • Check which BCM codes returned after re-test

  • Note any codes that return immediately

• Step 12: Programming note

  • If the BCM was replaced/swapped, some vehicles require configuration/programming for features to work correctly

• If the issue is still present

  • Call or email UpFix for the fastest help, especially if the issue happens immediately after install