Trunk Won't Open with Key Fob or Interior Latch Button

You press the button on your key fob and nothing happens. You try the interior trunk release button on the dashboard still nothing. Now you're stuck with a trunk that won't budge, and you've got groceries, luggage, or tools locked inside. When both the remote and the interior latch button fail at the same time, it usually points to a deeper electrical or mechanical problem rather than a simple dead fob battery. Figuring out the root cause early saves you time, money, and the frustration of prying things open the wrong way.

Why Would Both the Key Fob and Interior Button Stop Working?

Your trunk release system has several links in a chain: the key fob sends a wireless signal, the car's body control module receives it, a relay switches power to the trunk release solenoid, and the solenoid mechanically pops the latch. The interior release button works in a similar way, usually tapping into the same relay or solenoid circuit. If both methods fail at once, the problem typically sits after the signal stage meaning the shared relay, the solenoid itself, the wiring between them, or the latch mechanism is at fault.

Think of it like a light switch and a smart app both controlling the same bulb. If the bulb is burned out, it doesn't matter which switch you use. The same logic applies to your car trunk latch not releasing through either method.

What Are the Most Common Causes?

Here are the usual suspects, ranked from most to least likely based on common shop experience:

Blown trunk release fuse. This is the first thing to check. A single fuse protects the circuit that powers both the remote and the interior button. Check your owner's manual for the fuse location and rating.
Failed trunk release solenoid. The solenoid is a small electric motor or electromagnetic actuator that physically pushes the latch open. Over time, the internal coil burns out or the plunger corrodes and sticks. If you fix a stuck trunk release solenoid, the trunk often works normally again.
Broken trunk release cable or rod. In some cars, especially older models, a cable or metal rod connects the solenoid to the latch. If this cable snaps or pops out of its clip, the solenoid moves but nothing reaches the latch.
Bad relay. The relay is an electrical switch that sends power to the solenoid when triggered. Relays can wear out, and a bad one interrupts the signal from both the fob and the interior button.
Wiring damage or corrosion. Trunk wiring flexes every time you open and close the lid. Wires can break inside their insulation, or connectors corrode especially in humid climates or on older vehicles.
Body control module (BCM) issue. Less common, but possible. The BCM manages many electrical functions, including trunk release. A software glitch or internal failure can disable the trunk release output.
Trunk lock cylinder mechanical failure. If the physical lock cylinder itself is jammed or damaged, even a working solenoid can't pop the latch. Try inserting your physical key into the trunk lock to rule this out.

How Do I Diagnose the Problem at Home?

You don't need a full shop to narrow things down. Start with the easy checks and work your way toward the harder ones.

Step 1: Check the Fuse

Look in your owner's manual or the fuse box cover diagram. Find the fuse labeled "trunk," "trunk release," or "body electronics." Pull it out and inspect the metal strip inside. If it's broken or blackened, replace it with one of the same amperage. Test the trunk. If it works, you're done. If the new fuse blows immediately, you have a short somewhere in the wiring.

Step 2: Listen for the Solenoid

Have someone press the interior trunk button while you put your ear near the trunk lid. Do you hear a click, hum, or thump? If you hear the solenoid trying to work, the electrical side is probably fine the issue is mechanical (stuck latch, broken cable, or misaligned striker). If you hear nothing at all, the solenoid isn't getting power or has failed.

Step 3: Test with a Multimeter

If you have a basic multimeter, check for voltage at the solenoid connector when the button is pressed. No voltage means the problem is upstream (fuse, relay, wiring, or BCM). Voltage present but no action means the solenoid itself is dead or seized.

Step 4: Try the Physical Key

Many cars have a key slot on the trunk lid. Insert your mechanical key and turn. If the trunk opens this way, the lock cylinder and latch are fine confirming the problem is in the electric release circuit. For a full walkthrough on trunk release troubleshooting, check the linked guide.

Common Mistakes People Make

Only replacing the key fob battery. A weak fob battery can cause remote issues, but it won't explain why the interior button also fails. Don't spend money on fob batteries or reprogramming before checking the fuse and solenoid.
Prying the trunk open with a screwdriver. This can bend the latch, crack the trunk lid, or damage the weather seal. Try every non-destructive method first.
Ignoring the trunk light. If the trunk light doesn't come on when you manually open the trunk (via the rear seat pass-through or physical key), the trunk latch switch might think the trunk is already closed, which can confuse the release logic.
Skipping the relay check. People jump straight to the solenoid. But swapping a $5 relay is cheaper and easier than replacing a $50 solenoid.
Forcing the interior release button. Holding the button down for long periods can overheat the solenoid coil and cause additional damage if there's a binding issue in the latch.

Can I Open the Trunk from Inside the Car?

Yes, in most vehicles. Fold down the rear seats using the release levers in the cabin. Crawl into the trunk area and look for an emergency trunk release handle it's usually a glow-in-the-dark T-shaped pull near the latch. If you see it, pull it firmly. If there's no emergency release, you may be able to reach the latch mechanism directly and manually release it. This gets you access without damaging anything.

When Should I See a Mechanic?

Handle the fuse and basic visual inspection yourself. But take the car to a mechanic or auto electrician if:

The fuse keeps blowing after replacement.
You have voltage at the solenoid but it still won't actuate.
You suspect a BCM or wiring issue these can be tricky to diagnose without a scan tool.
The trunk physically won't open even with the mechanical key.
You've tried everything in this list with no results.

A shop can use a diagnostic scan tool to read BCM fault codes and pinpoint the exact failure.

How Much Does It Cost to Fix?

Fuse replacement: Under $5 DIY in five minutes.
Trunk release relay: $10–$30 for the part, easy swap.
Trunk release solenoid: $30–$100 for the part. Labor adds $50–$150 if a shop does it.
Trunk release cable or rod: $15–$40 for the part, similar labor to the solenoid.
Wiring repair: Varies widely, $50–$300 depending on the extent of the damage.
BCM replacement or reprogramming: $200–$600+, including programming at the dealer.

How Can I Prevent This from Happening Again?

Don't overload the trunk with heavy items pressing against the latch area. Excess weight can strain the release cable and solenoid over time.
Keep the trunk drain holes clear. Water intrusion corrodes connectors and solenoid housings.
Periodically spray a small amount of white lithium grease on the latch mechanism to keep it moving freely.
Fix any trunk weather seal gaps. Letting moisture in accelerates wiring corrosion.

Quick Diagnostic Checklist

Check the trunk release fuse replace if blown.
Press the interior button and listen at the trunk for a solenoid sound.
Try the physical key in the trunk lock cylinder.
Check the key fob battery if the interior button works but the fob doesn't.
Swap the trunk release relay with an identical one from the fuse box (like the horn relay) to test.
Fold the rear seats down and use the emergency trunk release from inside.
Test for voltage at the solenoid with a multimeter when the button is pressed.
Inspect the release cable for breaks or disconnections.
Replace the solenoid if it has power but won't actuate.
Visit a mechanic if the fuse keeps blowing or you suspect a BCM issue.

Work through the list in order most trunk release problems get solved by step four. The rest are less common but still fixable without a dealer visit in most cases.