This procedure addresses removal and replacement of the ignition control module on a 6.7L Cummins diesel engine. Note: Diesel engines do not use traditional ignition control modules; this procedure assumes the task refers to the Engine Control Module (ECM) or a related electronic control component.

Warnings

Tools required

Parts

• Engine Control Module (ECM) × 1 — Use OEM specification - requires VIN-specific programming
• ECM mounting gasket/seal (if equipped) × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and set parking brake
2. Turn ignition off and remove key
3. Disconnect negative battery cable first, then positive battery cable
4. Wait minimum 10 minutes for capacitors to discharge
5. Document or photograph ECM connector orientations before removal

Procedure

1. 1

   Access ECM location
   The ECM on the 6.7L Cummins is located on the driver side of the engine compartment, mounted to the inner fender well. Remove any intake air ducting or components obstructing access to the ECM mounting area.
2. 2

   Remove ECM protective cover
   If equipped with a protective cover over the ECM, remove the mounting screws securing the cover. Set cover and hardware aside in a clean, dry location.
   Torque spec

   Cover Screws15 Nm (11 lb-ft)
3. 3

   Disconnect ECM electrical connectors
   Locate the electrical connectors on the ECM (typically two or three large multi-pin connectors). Release the connector locks by pressing the release tabs and carefully pulling connectors straight out. Do not twist or force connectors. Inspect connector pins for damage or corrosion.
4. 4

   Remove ECM mounting fasteners
   Remove the mounting bolts securing the ECM to the bracket or fender well. Support the ECM while removing the final fastener to prevent it from falling.
   Torque spec

   Mounting Bolts37 Nm (27 lb-ft)
5. 5

   Remove ECM from vehicle
   Carefully lift the ECM away from its mounting location. Avoid contact with sharp edges or contamination from dirt, oil, or fluids. Place the old ECM in a protective container if being returned for core charge.
6. 6

   Inspect mounting bracket and connections
   Examine the ECM mounting bracket for damage, corrosion, or loose hardware. Clean the mounting surface and bracket. Inspect all electrical connectors for bent pins, corrosion, or contamination. Clean connectors with electrical contact cleaner if needed and allow to dry completely.
7. 7

   Install new ECM
   Position the new ECM onto the mounting bracket, ensuring proper alignment with mounting holes and connector access. If equipped with a mounting gasket or seal, ensure it is properly seated. Install mounting bolts and tighten to specification in a cross-pattern.
   Torque spec

   Mounting Bolts37 Nm (27 lb-ft)
8. 8

   Connect ECM electrical connectors
   Apply a thin coat of dielectric grease to connector seals (not pins) if desired for corrosion protection. Align each connector with its corresponding ECM port and press firmly until the connector locks click into place. Verify all connectors are fully seated and locked.
9. 9

   Reinstall protective cover
   If equipped, reinstall the ECM protective cover and secure with mounting screws torqued to specification.
   Torque spec

   Cover Screws15 Nm (11 lb-ft)
10. 10

    Reconnect battery and initialize ECM
    Reconnect battery cables (positive first, then negative). The new ECM will require programming and initialization using factory diagnostic equipment. Connect scan tool and perform ECM programming, VIN programming, and all required initialization procedures per manufacturer specifications.

Reassembly

1. Reinstall any air intake components or ducting removed for access
2. Ensure all electrical connectors are properly locked and sealed
3. Verify all mounting hardware is torqued to specification
4. Clear any diagnostic trouble codes that may have set during installation

Verification

• Turn ignition to ON position (do not start) and verify instrument cluster illuminates normally with no unusual warning lights beyond expected startup sequence
• Start engine and verify it runs smoothly without unusual warning lights or messages
• Use scan tool to verify ECM communication on all network buses and confirm no active fault codes
• Test drive vehicle to confirm normal operation of engine, transmission, and all electronic systems
• Verify cruise control, exhaust brake (if equipped), and all engine-related functions operate properly
• Confirm ECM software version and calibrations match vehicle requirements using scan tool

More procedures for this vehicle