With most modern Trailblazer models, you start the engine using a push‑button Start and a key fob, not a traditional ignition key. If you’re driving an older Trailblazer that still uses a physical key, you can insert and turn the key to start the engine. Remote starting is also possible on equipped trims via the key fob or a connected app. Here’s how to do it, plus what to do if your fob battery is dead.
The Trailblazer’s ignition system varies by model year and trim. This guide covers the typical push‑button Start, remote start options, and how to handle emergency situations when the fob isn’t cooperating.
Starting with push-button Start (no physical key needed)
Follow these steps to start the Trailblazer using the Start/Stop button with the key fob inside the cabin.
- Ensure the transmission is in Park (automatic) and that all passengers are seated with seat belts fastened.
- Have the key fob inside the vehicle where the system can detect it.
- Press the brake pedal firmly with your foot.
- Press the Start/Stop button to start the engine.
- To switch off, bring the vehicle to Park and press the Start/Stop button again.
If the engine doesn’t start, check that the key fob is inside, the fob battery isn’t dead, and that you’re pressing the brake while in Park. If problems persist, consult the owner's manual or contact roadside assistance.
Remote start options (key fob or app)
Many Trailblazer trims offer remote start so you can warm or cool the interior before you enter. Use the key fob or the compatible mobile app to start the engine from outside the vehicle, depending on your configuration.
- Using the key fob: with the vehicle locked, press the Lock button once, then press and hold the Start/Stop button on the fob for several seconds until the engine starts. The climate control may begin running in remote start mode.
- Stopping remotely: press the Start/Stop button again on the fob, or press Lock to secure the vehicle.
- Using the mobile app: open the MyChevrolet (or OnStar/Connected Services) app, select Remote Start, and confirm. The engine will start and run for a preset duration.
Note: Remote start requires the vehicle to be equipped with the feature and an active connected service (subscription or plan). Do not use remote start in enclosed spaces or garages, and ensure doors are closed for safety.
Traditional ignition key (older Trailblazer models)
Some older Trailblazer models use a conventional ignition key. If yours has this setup, follow these steps:
- Insert the key into the ignition switch located on the steering column or dashboard.
- Turn the key to the ON position to power accessories, then continue to START to crank the engine.
- Release the key once the engine starts; the switch will return to the ON position.
Older ignition systems don’t rely on a fob for starting. If your vehicle won’t start with the key, verify the key is fully inserted, the battery in the key is good, and the ignition switch isn’t jammed. If issues persist, contact a dealer.
Safety and quick tips
To keep starting smooth and safe, keep these tips in mind:
- Always start in a well‑ventilated area; do not run the engine in closed spaces like a garage.
- Ensure the transmission is in Park before starting (or neutral if the vehicle supports it).)
- If the key fob is not detected, try bringing the fob closer to the Start/Stop button or the designated fob pocket area, and replace the fob battery if needed.
- For remote start, confirm that you’re within range and that any climate control settings are appropriate for the weather.
If you’re ever unsure which ignition system your Trailblazer uses, or you can’t find the Start/Stop button, refer to your owner’s manual or contact a Chevrolet dealer for model-specific instructions.
Summary
Most Trailblazer models today start with a push-button Start using a key fob inside the cabin. If you have an older model with a traditional ignition key, insert and turn the key to start. Remote starting is available on supported trims via the key fob or mobile app, with safety reminders to avoid starting in confined spaces. When in doubt, consult the manual or seek dealer assistance to ensure you’re starting your Trailblazer correctly and safely.