This procedure covers the removal and replacement of the ignition control module on the 2014-2018 Chevrolet Silverado 1500 with the 5.3L V8 L83 engine.

Warnings

Tools required

Parts

• Ignition control module × 1 — ACDelco D581A or OEM equivalent
• Dielectric grease packets × 1 — Use OEM specification

Preparation

1. Ensure engine is completely cool
2. Park vehicle on level surface and engage parking brake
3. Disconnect negative battery cable and wait 2 minutes for capacitor discharge
4. Remove engine cover by pulling upward on cover to disengage retaining grommets
5. Photograph ignition coil and wiring harness arrangement for reference during reassembly

Procedure

1. 1

   Access the ignition control module
   Locate the ignition control module mounted on the driver side valve cover. The module is integrated into the ignition coil assembly and controls coils 1, 3, 5, and 7. Remove any wire harnesses or brackets obstructing access to the coil pack.
2. 2

   Disconnect electrical connectors
   Press the release tab on each ignition coil electrical connector and carefully pull straight up to disconnect. There are four individual coil connectors on this bank. Note the connector positions and routing for reassembly.
3. 3

   Remove ignition coil bolts
   Using an 8mm socket, remove the bolt securing each ignition coil to the valve cover. Each coil has one retaining bolt. Keep bolts organized by cylinder position.
   Torque spec

   Ignition Coil Bolts8 Nm (6 lb-ft)
4. 4

   Extract ignition coils
   Grasp each ignition coil firmly and pull straight up with a twisting motion to break the seal between the coil boot and spark plug. Remove all four coils from cylinders 1, 3, 5, and 7. Inspect boots for tears or carbon tracking damage.
5. 5

   Remove control module mounting bolts
   The ignition control module bracket is secured to the valve cover or engine block with mounting bolts. Remove these bolts using a 10mm socket. Support the module assembly while removing the final bolt.
   ⚠Module assembly may be heavier than expected; support it to prevent dropping
   Torque spec

   Mounting Bolts34 Nm (25 lb-ft)
6. 6

   Disconnect module main harness
   Locate the main wiring harness connector on the ignition control module. Depress the locking tab and carefully disconnect the connector from the module. Inspect connector terminals for corrosion or damage.
7. 7

   Remove old ignition control module
   Carefully lift the ignition control module assembly away from the engine. Note the orientation and any mounting brackets that must be transferred to the new module.
8. 8

   Prepare new ignition control module
   Transfer any reusable brackets or hardware from the old module to the new module if they are not included. Apply a thin coating of dielectric grease to all coil boot interiors to prevent moisture intrusion and ensure proper sealing.
9. 9

   Install new control module
   Position the new ignition control module in the mounting location, ensuring proper alignment with mounting holes and electrical connector access. Hand-thread mounting bolts to prevent cross-threading.
   Torque spec

   Mounting Bolts34 Nm (25 lb-ft)
10. 10

    Reconnect main harness connector
    Connect the main wiring harness to the ignition control module, ensuring the connector locks fully into place with an audible click. Verify the locking tab is properly engaged.
11. 11

    Install ignition coils
    Insert each ignition coil into its corresponding cylinder bore, ensuring the boot seats fully onto the spark plug terminal. A firm downward press with slight rotation should seat the coil completely. Install and torque the coil retaining bolts to specification.
    Torque spec

    Ignition Coil Bolts8 Nm (6 lb-ft)
12. 12

    Reconnect coil electrical connectors
    Connect each ignition coil electrical connector, pushing firmly until the locking tab clicks into place. Verify each connection is secure by gently pulling on the connector body.
13. 13

    Reinstall accessories and engine cover
    Reinstall any brackets, harnesses, or components removed for access. Replace the engine cover by aligning the mounting grommets and pressing down firmly until seated.

Reassembly

1. Reconnect negative battery cable and tighten securely
2. Verify all electrical connectors are properly seated and locked
3. Ensure no tools or parts remain in the engine compartment
4. Check that engine cover is properly installed and all grommets are engaged

Verification

• Start the engine and verify it runs smoothly without misfires or rough idle
• Check for diagnostic trouble codes using a scan tool; clear any codes related to the repair
• Allow engine to reach operating temperature and verify no misfire codes return
• Perform a test drive under various load conditions to confirm proper ignition system operation
• Verify no fuel trim abnormalities or pending codes are present after test drive

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