Most Nissan Altima models can be started with either a traditional ignition key or a push-button Start system using an Intelligent Key. If the battery in the key fob or the vehicle’s electronics falter, there are backup methods outlined by Nissan for many model years. This guide explains the common scenarios and how to proceed.
Identify your ignition setup
Before attempting to start manually, determine whether your Altima uses a traditional ignition cylinder or a push-button Start with an Intelligent Key. Look for an ignition slot near the steering column or the familiar Start/Stop button inside the cabin, and consult your owner's manual for the exact backup procedure based on your year and trim.
To help you navigate, the article below covers the two most common setups—traditional ignition and push-button Start with Intelligent Key—and what to do if you encounter a dead key fob battery.
Starting with a traditional ignition (ignition cylinder)
If your Altima has a conventional key ignition, follow these steps to start the engine manually.
- Move the transmission to Park (P) and ensure the parking brake is engaged.
- Insert the physical key into the ignition cylinder located on the steering column or steering wheel area.
- Turn the key to the Start position and hold briefly until the engine catches, then release to the Run position.
- Let the engine run and verify gauges are normal before driving.
Following these steps should start the engine on models equipped with a traditional ignition. If the engine doesn’t start, check the battery, starter, or fuses, and consider consulting a dealer or roadside assistance.
Starting with a Nissan Intelligent Key and push-button Start
For Altimas equipped with a push-button Start and an Intelligent Key, use these steps to start the car when everything is functioning normally.
- Ensure the Intelligent Key is inside the vehicle (in your pocket or bag) and that your foot is firmly on the brake pedal.
- With the brake pressed, press the Start/Stop button once to start the engine. Do not hold the button; the engine should start and the dash should come alive.
- Once started, shift into Drive or Reverse as needed and begin driving.
- If the engine does not start, verify the key is inside the vehicle and the battery in the key fob is functioning. If needed, replace the key fob battery or use a spare key if available.
Many Altimas with Intelligent Key systems include an emergency backup procedure in the owner’s manual if the key fob battery is dead. This often involves a workaround such as using a mechanical key blade or a designated spot to place the fob to enable starting. Always refer to your manual for your exact year/trim, as the backup method can vary.
What to do if the key fob battery is dead
A dead key fob battery can prevent the Start/Stop system from recognizing the Intelligent Key. Here are the general remedies you should consider, noting that exact steps depend on model year.
- Replace the key fob battery with a fresh one, following the battery type specified in your manual.
- If replacement isn’t possible immediately, use the manual’s emergency backup method if your model supports it (this may involve a hidden key blade or a specific location to place the fob).
- With a functioning fob, the car should start normally using the Start/Stop button while brake pedal is pressed.
- If the backup method doesn’t work, contact roadside assistance or a Nissan dealer for service, as the immobilizer or other systems may be affected.
Bottom line: a dead fob battery can block a normal start, but most Altimas provide a documented emergency workaround. Check the owner’s manual for the precise steps for your model year.
Summary
In short, you can manually start a Nissan Altima either with a traditional ignition key or with the Intelligent Key system and push-button Start. For traditional keys, insert the key, turn to Start, and go. For Intelligent Key with Push-Button Start, ensure the key is inside the vehicle and press the brake, then press Start/Stop to start. If the key fob battery is dead, consult the owner’s manual for the exact emergency start procedure, or replace the fob battery and attempt a standard start again. If problems persist, seek professional assistance. Quick reference: know your ignition type, carry a spare key or fresh battery, and follow the model-year-specific backup steps provided by Nissan.