Replace the overdrive solenoid in the 8-speed automatic transmission to restore proper transmission operation and gear shifting.

Warnings

Tools required

Parts

• Overdrive solenoid (Solenoid Valve Body) × 1 — Use OEM Hyundai part 46210-3B700 or equivalent
• Transmission pan gasket × 1 — Use OEM specification
• O-ring for solenoid (if not included with solenoid) × 1 — Use OEM specification
• Transmission drain plug crush washer × 1 — Use OEM specification

Fluids

• Hyundai SP-IV-M ATF — 5 qt

Preparation

1. Ensure vehicle is completely cool and parked on level surface
2. Engage parking brake and chock rear wheels securely
3. Raise front of vehicle and support on jack stands at manufacturer frame points
4. Remove engine splash shield if equipped to access transmission pan
5. Place drain pan underneath transmission pan area

Procedure

1. 1

   Drain transmission fluid
   Locate the transmission drain plug on the bottom of the transmission pan. Using a 14mm socket, carefully loosen and remove the drain plug. Allow fluid to drain completely into catch pan (approximately 4-5 quarts will drain). Once drained, reinstall drain plug with new crush washer and torque to specification.
   ⚠Fluid may still be warm even after cooling period. Verify temperature before proceeding.
   Torque spec

   Transmission Drain Plug30 Nm (22 lb-ft)
2. 2

   Remove transmission pan bolts
   Using a 10mm socket, remove all transmission pan bolts in a criss-cross pattern starting from the center and working outward. There are approximately 20 bolts securing the pan. Loosen bolts gradually to prevent warping the pan. Keep bolts organized for reinstallation.
   Torque spec

   Pan Bolts16 Nm (12 lb-ft)
3. 3

   Remove transmission pan
   Carefully lower the transmission pan. Some residual fluid will drain (approximately 1 quart), so ensure drain pan is positioned. Use a flathead screwdriver to gently break the gasket seal if pan is stuck, taking care not to damage the mating surface. Remove and discard old gasket material from both pan and transmission case using plastic scraper.
4. 4

   Inspect transmission filter and magnet
   Examine the transmission pan magnet for excessive metal debris (some fine material is normal). Inspect the visible transmission filter for damage or excessive contamination. Clean the pan thoroughly and wipe the magnet clean. If excessive debris is present, further transmission inspection may be needed.
   ℹ️Large metal chunks or excessive debris indicates internal transmission wear requiring further diagnosis.
5. 5

   Locate and access overdrive solenoid
   With pan removed, locate the valve body assembly. The overdrive solenoid is typically positioned on the side of the valve body with an electrical connector. Note the exact orientation and routing of the wiring harness before removal. Take photos if needed for reference during reinstallation.
6. 6

   Disconnect solenoid electrical connector
   Carefully depress the connector locking tab and disconnect the electrical connector from the overdrive solenoid. Do not pull on wires; use the connector body. Inspect connector pins for corrosion or damage.
7. 7

   Remove overdrive solenoid
   Using a 10mm socket, remove the solenoid mounting bolt(s) securing the overdrive solenoid to the valve body. Carefully pull the solenoid straight out from the valve body bore. Remove and inspect the O-ring seal. Note any fluid leakage points or damage to the solenoid mounting area.
   Torque spec

   Sensor Bolts11 Nm (8 lb-ft)
8. 8

   Install new overdrive solenoid
   Lubricate the new O-ring with clean ATF fluid and install onto the new solenoid. Carefully insert the solenoid into the valve body bore, ensuring proper alignment and that the O-ring does not roll or pinch. Install mounting bolt(s) and torque to specification. Reconnect electrical connector until it clicks securely.
   ⚠Do not force solenoid into bore. If resistance is felt, remove and check for proper O-ring seating and alignment.
   Torque spec

   Sensor Bolts11 Nm (8 lb-ft)
9. 9

   Clean and prepare pan surfaces
   Thoroughly clean both the transmission case mating surface and transmission pan flange using brake cleaner and plastic scraper. Remove all old gasket material and ensure surfaces are completely clean and dry. Any debris or old gasket material will cause leaks.
10. 10

    Install new pan gasket and pan
    Position the new transmission pan gasket on the pan, ensuring all bolt holes align properly. Carefully raise the pan into position against the transmission case. Start all pan bolts by hand to prevent cross-threading. Once all bolts are started, tighten in a criss-cross pattern from center outward to specification.
    ⚠Do not overtighten pan bolts as this will distort the pan and cause leaks. Use torque wrench for final tightening.
    Torque spec

    Pan Bolts16 Nm (12 lb-ft)
11. 11

    Reinstall splash shield and lower vehicle
    Reinstall engine splash shield if removed. Double-check all fasteners are tight. Remove jack stands and carefully lower vehicle to ground.
12. 12

    Refill transmission fluid
    Locate the transmission fill plug (typically on side of transmission case or through dipstick tube depending on model year). Using fluid pump or funnel with hose, add approximately 4-5 quarts of Hyundai SP-IV-M ATF. Start with less than drained amount as filter retains some fluid.
    ⚠Overfilling transmission can cause shifting issues and fluid aeration. Add fluid conservatively and check level carefully.
13. 13

    Check fluid level and cycle transmission
    Start engine and allow to idle. With foot on brake, shift through all gear positions (P-R-N-D-L) pausing 2-3 seconds in each. Return to Park. With engine running and transmission fluid at operating temperature (160-180°F), check fluid level per manufacturer procedure. Add fluid as needed to bring to proper level on dipstick or until fluid reaches bottom of fill hole.

Reassembly

1. Ensure all electrical connectors are fully seated and locked
2. Verify transmission pan bolts are torqued in proper criss-cross pattern
3. Confirm drain plug crush washer was replaced and plug is properly torqued
4. Double-check that correct Hyundai SP-IV-M ATF fluid was used

Verification

• Start engine and verify no fluid leaks from transmission pan or drain plug
• Test drive vehicle through all gears to verify proper shifting operation
• Monitor for any transmission warning lights or error codes using scan tool
• Recheck fluid level after test drive when transmission is at operating temperature
• Verify overdrive function operates correctly at highway speeds (typically engages above 45 mph)
• Inspect underneath vehicle after 24 hours of driving to confirm no delayed leaks

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