These instructions apply to the Isuzu D-Max Mk2 (TF) 2012-2020.
For other models, please choose your vehicle here.
If the gear lever on your automatic Isuzu D-Max (TF, 2012–2020) won’t move out of ‘P’ — typically with a flat battery or a brake-switch fault — you can release it using the shift-lock override built into the lever. No tools needed.
Every automatic D-Max of this generation has a shift-lock interlock, a safety feature that keeps the lever mechanically trapped in Park until you press the brake pedal with the ignition on. In normal use that is exactly what you want: it stops the truck being knocked out of Park accidentally. The catch is that the interlock is electrically operated, so if the battery is flat, a fuse has blown, or the brake-light switch has failed, the solenoid that should free the lever never releases and the truck feels locked in ‘P’. Rather than leave you stranded, the lever carries a built-in manual override so you can free it by hand and get the vehicle rolling onto a trailer, out of a bay, or across to a helper. It is a designed-in get-you-going function, not a sign of damage.
How the Interlock Works on This Model
With the ignition on and your foot on the brake, a small solenoid pulls the shift-lock pawl clear and the lever moves freely. When there is no power reaching that solenoid, or the brake signal never arrives, the pawl stays engaged and the lever will not budge no matter how hard you push the release button. The manual override simply lets you move that same pawl mechanically, which is why the procedure asks you to hold the shift-lock release together with the normal lever button. Because you are bypassing a safety interlock, securing the truck first is essential — once ‘P’ is released, nothing but the brakes is holding it.
Before You Start — Safety
- Apply the parking brake and keep your foot on the brake — the truck can roll once ‘P’ is released.
- Park on level ground wherever possible before attempting the override.
- Consider chocking a wheel if there is any slope, as a laden pickup builds momentum quickly.
- Make sure the area ahead of and behind the truck is clear of people before you free the lever.
- Only move the lever when you are ready to control the vehicle and, if it is to be driven, the engine will start.
Releasing the Lever from Park
- Fully depress the brake pedal.
- Apply the parking brake.
- At the same time, press the gear-shift lock release button and press the gear-lever button.
- Move the gear lever out of ‘P’.
If It Won’t Release
- Keep firm pressure on the brake pedal while you operate the override — a light press is not always enough.
- Make sure you are pressing both buttons together, not one after the other, before you try to move the lever.
- If the battery is completely flat, jump-starting or charging it may restore the normal shift-lock and save using the override at all.
- Check the fuses and the brake-light operation — if the brake lights don’t work, a failed brake switch is a likely cause of the lock.
- Don’t force the lever with a tool; if the manual override won’t move it, stop and have the interlock checked.
After Using the Override
- Have the cause checked — a flat battery or a faulty brake-light switch commonly triggers it.
- A stored fault can be read — look it up on autodtcs.com.
- Once the underlying issue is fixed, confirm the lever moves normally with the brake pressed before relying on the truck again.
Frequently Asked Questions
Where is the shift-lock release on a D-Max?
It’s the shift-lock release button at the gear lever, pressed together with the lever button. On this generation it is part of the lever assembly rather than a separate hidden slot, so you operate it by hand while holding the brake and the parking brake.
Is it safe to use?
Only with the brake pressed and the parking brake applied — the truck can roll once out of ‘P’. Treat it as bypassing a safety interlock: secure the vehicle first, keep the area clear, and be ready to hold it on the brakes the moment the lever leaves Park.
Why won’t my lever come out of P?
Often a flat battery or a brake-light switch fault stops the normal shift-lock from releasing. The interlock solenoid needs power and a valid brake signal to free the lever; if either is missing, the lever stays trapped until you use the manual override or fix the supply.
Do I need a tool?
No — it’s a built-in manual override. You free the lever by pressing the shift-lock release and the lever button together while holding the brake. If it still will not move, that points to a mechanical fault rather than something a tool should be forced against.
Will the override fix the problem permanently?
No. It only gets you out of Park for now; it does not repair whatever stopped the interlock releasing. Once you are safe, have the battery, fuses and brake-light switch checked so the normal shift-lock works again and you are not relying on the override every time.
Could a flat battery be the only cause?
Frequently, yes. A dead or very weak battery leaves the interlock solenoid without power, so the lever locks. Recharging or jump-starting often restores normal operation. If the battery is healthy and the lever still sticks, look next at the brake-light switch and the relevant fuses.
If the lever stuck after a battery issue, see our D-Max battery guide, and decode any fault on autodtcs.com.
Independent guide — not affiliated with Isuzu. Always follow your official service manual and safety precautions. Read our full disclaimer.