2021-2024 Hyundai Starter Freezing & Solenoid Replacement TSB

Hyundai has released Technical Service Bulletin (TSB) 26-EE-003H to address a specific cold-weather starting concern affecting several models from 2021 to 2024. Owners may experience difficulty starting their vehicle when ambient temperatures are low. This bulletin provides a detailed procedure for inspecting the starter magnetic switch for potential freezing and, if necessary, replacing the starter magnetic switch (solenoid) assembly.

The TSB applies to various Hyundai models, including the Elantra, Kona, Santa Fe, Sonata, Tucson, Veloster, and Venue, across model years 2021-2024. For example, if you own a 2024 Hyundai Tucson, and you are experiencing issues starting in cold weather, this TSB is relevant to your vehicle.

Symptoms

The primary symptom addressed by TSB 26-EE-003H is difficulty starting the vehicle in cold weather. This can manifest as the engine not cranking, or cranking very slowly, when attempting to start the vehicle.

Diagnosis / Trigger Conditions

To diagnose the 2024 Hyundai Tucson starter freezing issue, technicians must perform an inspection in cold ambient temperatures, ideally outdoors. The inspection process involves several steps:

1. Verify Starter Freezing: Attempt to start the vehicle. If the engine does not rotate or buzz, the starter may be frozen. If the dashboard or interior lights blink or dim, this indicates a discharged battery, which should be recharged before re-testing.
2. Starter Relay Test: Remove the starter relay from its box. Bridge the connection across terminals (A) and (B) for 1 to 2 seconds to confirm if the starter motor runs.
3. Evaluate Starter Behavior:
   • If the engine rotates slowly or a buzzing sound is heard, it's likely not a freezing problem, and other causes should be investigated.
   • If dashboard/interior lights flicker or dim during the start attempt, this typically points to a battery discharge issue, not freezing.
   • If there is no starter operation, engine movement, or other electrical fluctuations, a frozen starter is the most likely cause.
4. Jumper Pack Test: Connect a jumper pack to the battery terminals. If the engine starts normally, the vehicle battery should be checked for abnormalities. If the engine still does NOT start normally, proceed to the starter magnetic switch replacement procedure.

Repair Procedure Summary

If the inspection confirms a frozen starter, the repair involves replacing the starter magnetic switch assembly. The general steps for this procedure are:

1. Remove the Starter Magnetic Switch: Technicians will remove the existing starter magnetic switch assembly by following the instructions in the shop manual, specifically under