Transmission Secure Vehicle When Starting | Fault Code 420106 Shift Lock Solenoid Fixed

In this video I explain and fix the “Transmission Secure Vehicle When Starting” warning message caused by fault code 420106, which relates to a shift lock solenoid fault. When this fault occurs, the vehicle may refuse to come out of Park, display transmission warnings, or prevent normal gear selection. I show the symptoms, explain what the shift lock solenoid does, why this fault occurs, and how repairing or replacing the faulty component clears the warning message and restores normal operation. This fault is commonly seen on vehicles with electronic gear selectors and applies to several automatic transmission systems with similar designs. WHAT’S COVERED: Meaning of the “Transmission Secure Vehicle” warning Explanation of fault code 420106 What the shift lock solenoid does Common causes such as solenoid failure, wiring issues, or low voltage Accessing and repairing or replacing the shift lock solenoid Clearing the fault code and testing gear selection TOOLS & PARTS USED (): Basic hand tools - https://amzn.to/3Y46YYr Trim removal tools - https://amzn.to/4j9J3As Replacement spring or repair kit (if required) - https://amzn.to/48Nem0q Diagnostic scanner for fault clearing - https://amzn.to/4p84F1k Gloves - https://amzn.to/4j6JXOd Torch - https://amzn.to/496Ct9l HEALTH & SAFETY: Disconnect the battery before working on gear selector or transmission electronics. Do not attempt repairs with the ignition switched on. Ensure the vehicle is secured and cannot roll. Avoid forcing the gear selector. Any work carried out is done entirely at your own risk. AFFILIATE & RESPONSIBILITY DISCLAIMER: Some links in this description may be Amazon affiliate links, meaning I may earn a small commission at no extra cost to you. Any work, repairs, or diagnostics you carry out are done at your own risk. I accept no responsibility for injury, transmission damage, or incorrect repairs. Always follow manufacturer procedures and safety guidelines. ⸻ 🔖 Hashtags #transmissionfault #shiftlock #gearselector #faultcode420106 #carrepair #mechanic #diagnostics #automatictransmission #diycarrepair