Starter Solenoid

This procedure covers the replacement of the starter solenoid on a 2012-2018 Jeep Wrangler with the 3.6L V6 engine, which requires removing the starter assembly for solenoid replacement.

Warnings

Tools required

Parts

• Starter solenoid × 1 — Use OEM specification
• Dielectric grease × 1 — Small packet

Preparation

1. Park vehicle on level ground and set parking brake firmly
2. Place wheel chocks behind rear wheels
3. Allow engine to cool completely if recently operated
4. Disconnect negative battery cable first, then positive cable
5. Raise front of vehicle and support securely on jack stands
6. Remove front skid plate if equipped to improve access

Procedure

1. 1

   Disconnect battery cables
   Using a 10mm socket, loosen and remove the negative battery cable first, then the positive cable. Move cables away from battery terminals to prevent accidental contact.
   Torque spec

   Battery Terminal Bolts8 Nm (6 lb-ft)
2. 2

   Access starter from underneath
   Position yourself under the passenger side of the vehicle. The starter is located on the passenger side of the engine block, bolted to the transmission bellhousing. Use a flashlight to locate the starter motor and identify the electrical connections.
3. 3

   Disconnect starter electrical connections
   Locate the solenoid terminal with the battery cable (B+ terminal) and the smaller trigger wire connector. Using a 13mm socket, remove the nut securing the battery cable to the solenoid. Disconnect the push-on connector for the trigger wire by pulling it straight off the solenoid terminal. Support the wires so they do not hang on anything.
   ⚠Even with battery disconnected, the B+ terminal carries battery voltage. Ensure the cable does not contact ground
   Torque spec

   Battery Terminal Bolts8 Nm (6 lb-ft)
4. 4

   Remove starter mounting bolts
   Using a 15mm socket with extension, remove the three starter mounting bolts that secure the starter to the bellhousing. The bolts may require penetrating oil if corroded. Keep track of bolt locations as they may be different lengths. Support the starter with one hand as you remove the final bolt.
   Torque spec

   Mounting Bolts39 Nm (29 lb-ft)
5. 5

   Remove starter assembly
   Carefully maneuver the starter assembly out from between the engine block and frame. The starter may need to be tilted and rotated to clear obstructions. Lower the starter down and out from underneath the vehicle. Place on a clean work surface.
6. 6

   Remove solenoid from starter
   With the starter on your workbench, identify the two or three screws or bolts securing the solenoid to the starter motor housing. Using a 10mm socket, remove these fasteners. Carefully pull the solenoid away from the starter motor, noting the position of the plunger that engages the drive mechanism. Some solenoids are crimped or permanently attached; if yours cannot be removed, the entire starter assembly must be replaced.
   ℹ️Note the orientation of the solenoid and position of any shims or gaskets for proper reassembly
   Torque spec

   Connector Screws4 Nm (3 lb-ft)
7. 7

   Install new solenoid
   Position the new solenoid onto the starter motor, ensuring the plunger properly engages with the shift fork mechanism. Align the mounting holes and install the mounting screws or bolts. Tighten the fasteners evenly to the specified torque to ensure proper seating.
   Torque spec

   Connector Screws4 Nm (3 lb-ft)
8. 8

   Clean starter mounting surface
   Use a wire brush to clean the mounting surface on the bellhousing where the starter mounts. Remove any rust, dirt, or old gasket material. This ensures proper ground contact and alignment. Clean the starter mounting bolt threads and apply a small amount of anti-seize if desired.
9. 9

   Install starter assembly
   Maneuver the starter assembly back into position from underneath the vehicle, guiding it between the engine and frame. Align the starter with the bellhousing mounting holes. Start all three mounting bolts by hand to ensure proper alignment before tightening any of them.
10. 10

    Torque starter mounting bolts
    Using a torque wrench and 15mm socket, tighten the starter mounting bolts to specification in a cross pattern. This ensures even seating and proper alignment with the flywheel ring gear.
    Torque spec

    Mounting Bolts39 Nm (29 lb-ft)
11. 11

    Reconnect starter electrical connections
    Reconnect the trigger wire push-on connector to the small solenoid terminal, ensuring it is fully seated. Position the battery cable onto the B+ terminal stud and install the retaining nut. Apply dielectric grease to the connections to prevent corrosion. Torque the terminal nut to specification.
    Torque spec

    Battery Terminal Bolts8 Nm (6 lb-ft)
12. 12

    Reinstall skid plate and lower vehicle
    If the front skid plate was removed, reinstall it with the appropriate hardware. Carefully lower the vehicle from the jack stands and remove the stands. Lower the vehicle completely to the ground.
    Torque spec

    Bracket Bolts23 Nm (17 lb-ft)
13. 13

    Reconnect battery cables
    Clean the battery terminals and cable ends with a wire brush or terminal cleaner. Reconnect the positive battery cable first, then the negative cable. Torque the terminal bolts to specification. Apply dielectric grease or terminal protector to prevent corrosion.
    ℹ️Always connect positive first, then negative to minimize spark risk
    Torque spec

    Battery Terminal Bolts8 Nm (6 lb-ft)

Reassembly

1. Ensure all electrical connections are tight and properly routed away from heat and moving components
2. Verify starter mounting bolts are torqued to specification for proper alignment with flywheel
3. Confirm battery cables are securely connected and terminals are clean

Verification

• Turn the ignition key to the start position and verify the engine cranks normally without unusual noises
• Listen for a single click from the solenoid when starting, indicating proper engagement
• Verify the starter disengages immediately when the key is released from the start position
• Check for any fluid leaks around the starter area that may have been disturbed during removal
• Test start the vehicle 3-4 times to ensure consistent operation

Related trouble codes on this vehicle

Codes that commonly send this job to the bay — tap one for symptoms, causes, and diagnostic steps.

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