The quickest overview: start with the Start/Stop button (brake applied) when power and the fob are working; if the fob battery is dead or the 12V battery is flat, use the backup methods described below. This guide covers safe, common methods for today’s Honda Odyssey models.
Starting with a healthy power supply (push-button Start/Stop)
What you need to know
These steps apply when the vehicle has power and the smart key fob is recognized inside the cabin. Make sure the vehicle is in Park and the parking brake is engaged before you attempt to start.
Before you begin, verify that you have a functional fob inside the vehicle and that the instrument cluster lights up when you press the brake pedal. Use the following steps to start the engine.
- Park the Odyssey with the transmission in Park (P) and set the parking brake.
- With the smart key fob inside the vehicle, depress the brake pedal firmly.
- Press the ENGINE START/STOP button once to start the engine. If it does not start, wait a moment and try again, ensuring the brake is still pressed and the fob is recognized.
- If the engine still won’t start, check for warning lights or messages on the instrument cluster and consult the owner’s manual or a dealer for diagnostic help.
Following these steps typically starts the Odyssey smoothly when power and the fob are functioning correctly.
Starting when the key fob battery is dead
What to know before you begin
If the smart key fob’s battery is dead, you still may be able to start the engine by using the fob near the Start/Stop button and ensuring the brake is pressed. If the vehicle does not respond, replace the fob battery and retry. Some models also allow using the mechanical key housed in the fob to unlock doors if needed.
Use these steps as a backup method when the fob battery is depleted but the vehicle has power from the 12V system.
- Park the Odyssey with the transmission in Park (P) and apply the parking brake.
- Hold the key fob close to the ENGINE START/STOP button and press the brake pedal firmly.
- With the fob near the button, press the ENGINE START/STOP button to start the engine. If the engine does not respond, replace the fob battery and try again.
- If the engine still won’t start after replacing the battery, consult a dealer or roadside assistance for service.
These steps provide a practical way to start the Odyssey when the fob’s battery is dead, which is a common issue. Replacing the fob battery is usually the quickest fix.
Jump-starting or powering a dead 12V battery
Why this matters
When the 12V battery is discharged, the vehicle may not power the starting system even if the fob is present. Jump-starting from another vehicle or a portable power pack can restore enough power to start the engine. Follow proper safety procedures to avoid injury or damage.
Here are the standard steps for a safe jump-start.
- Position a donor vehicle close enough to the Odyssey to reach the batteries, but do not let the vehicles touch. Turn off both engines and engage the parking brakes.
- Connect the red jumper cable to the positive terminal on the Odyssey’s 12V battery (or to the positive post if accessible).
- Connect the other end of the red jumper cable to the positive terminal of the donor vehicle’s battery.
- Connect the black jumper cable to the negative terminal of the donor vehicle’s battery.
- Connect the other end of the black jumper cable to a solid, unpainted metal engine block or chassis ground on the Odyssey, away from the battery (to reduce sparks).
- Start the donor vehicle and let it run for a few minutes, then attempt to start the Odyssey by pressing the brake and the ENGINE START/STOP button.
- After the Odyssey starts, keep it running and carefully remove the cables in reverse order: first the black clamp from the engine block, then the black clamp from the donor vehicle, then the red clamp from the donor battery, and finally the red clamp from the Odyssey’s battery.
- Drive to a safe location or to a service center to recharge the 12V battery fully.
If the Odyssey won’t start after a jump, the battery or electrical system may have a more serious issue and should be inspected by a professional. Never attempt multiple jump-starts in quick succession if the vehicle shows repeated symptoms of a fault.
Summary
In normal conditions, start by using the Start/Stop button with the brake depressed when power and a good fob are present. If the key fob battery is dead, hold the fob near the Start/Stop button and try again, replacing the battery as soon as possible. If the 12V battery is discharged, use a safe jump-start from another vehicle or a portable power pack, following the correct cable connection order and removing cables carefully after the engine is running. For persistent issues, contact a Honda dealer or roadside assistance for diagnosis and repair.