Owners Nissan Terrano (especially models R51 And R52 2014–2020) often encounter a problem when the gas tank flap refuses to open, either from the passenger compartment or manually. The situation becomes more complicated if this happens at a gas station or on the road, when access to fuel is critical. In 80% of cases, the problem is solved without visiting a service center, but requires an understanding of the mechanism and competent actions.

In this article we will look at all possible reasons - from a frozen lock to a broken cable, and we will also give step by step instructions with photos and diagrams. We will pay special attention hidden emergency opening lever, which even some masters do not know about. If you encounter this problem, don’t panic: in 9 out of 10 cases it can be fixed on your own in 10–30 minutes.

1. How does the mechanism for opening the hatch on a Nissan Terrano work?

B Terrano A combined system for opening the gas tank flap is used: electromechanical (from a button in the cabin) + mechanical (emergency cable). Unlike many crossovers, there is no separate lock with a key - only a central drive.

Main elements of the system:

  • 🔘 Button in the cabin — located on the panel to the left of the steering wheel (next to the headlight dimmer). When pressed, it sends a signal to the activator.
  • 🔧 Electric drive (activator) - a motor that pulls the cable. It is located in the rear door on the gas tank side.
  • 🧵 Cable — connects the activator to the hatch lock. Length ~40 cm, often breaks or falls off.
  • 🔒 Hatch lock - a plastic mechanism with a latch that locks the lid.
  • 🆘 Emergency cable — hidden under the trunk trim. Pulls manually when electronics fail.

On Terrano 2017+ added hatch position sensor, which sends a signal to the dashboard (the gas tank light flashes if the cap is not closed). This makes diagnosis more difficult, as the error may be false.

Diagram of the Terrano fuel tank flap mechanism

element Location Typical faults
Open button Left interior panel Oxidation of contacts, broken wiring
Electric drive (activator) Inside the back door Motor burnout, gear jamming
Cable From the activator to the hatch lock Breakage, dismounting from fastenings, stretching
Hatch lock On the gas tank cap itself Jamming due to dirt, spring breakage
Emergency cable Under the trunk trim Jam, loop break

If the button in the cabin does not work, this does not mean that the activator is broken. Perhaps the problem is fuse (F32, 10A) or relay (in the block under the hood). Check them before disassembling the door!

2. Top 7 reasons why the hatch does not open

According to statistics from service centers, the most common culprits are:

  1. Broken cable (35% of cases) - occurs due to wear or a sharp jerk when the lock freezes.
  2. Lock jammed (25%) - dirt, corrosion or deformation of plastic parts.
  3. Electric drive malfunction (20%) - the motor burns out or the gear jams.
  4. Wiring problems (10%) - oxidation of the button contacts or open circuit.
  5. Mechanism freezing (5%) - relevant in winter when moisture gets in.
  6. Electronics failure (3%) - door control module (BCM) error.
  7. Button failure (2%) - physical wear or liquid ingress.

The first thing to do is check emergency cable. It is located under the plastic trim in the trunk (gas tank side). Pull the red loop - if the hatch opens, the problem is in the electric drive or the cable of the main mechanism.

📊 What caused the breakdown in your case?
  • Broken cable
  • The lock is jammed
  • The button doesn't work
  • Mechanism frozen
  • Other

3. Step-by-step instructions: how to open the hatch manually

If the button in the cabin does not respond, and you need to refuel urgently, use emergency rope. It's on everyone Terrano regardless of the year of manufacture.

☑️ Emergency opening of the gas tank flap

Done: 0 / 1
  1. Open the trunk and remove the plastic trim from the side of the gas tank (it is secured with 4 clips).
  2. Find red loop (usually attached to the body with tape or a plastic clamp).
  3. Pull the loop on yourself until it clicks, the hatch should open.
  4. If the cable is stuck, try swinging it left and right while pulling it towards you.

⚠️ Attention: Do not use excessive force! On Terrano 2018+ The emergency cable is connected to a plastic lever that is easy to break. If the hatch does not budge, then the problem is in the lock itself (see section 5).

If the emergency cable also does not work, try the following method:

  1. Remove the rear door inner trim (unscrew 2 T20 Torx bolts and remove clips).
  2. Find electric drive (black plastic block with wiring).
  3. Disconnect the connector and apply +12V directly to the drive contacts (see diagram below). If the motor hums, but the hatch does not open, the problem is in the cable.
💡

On Terrano 2015–2017, the electric sunroof drive is combined with the rear door drive. If both do not work, check the control module (BCM) or fuse F28 (15A).

4. Diagnosis of faults: from simple to complex

Before disassembling the door, perform algorithm check:

Symptom Possible reason How to check
The button is not pressed Microswitch stuck or broken Remove the panel and check the contacts with a multimeter
The button is pressed, but the hatch does not open Broken cable, activator malfunction Pull the emergency rope. If it works, the problem is in the main cable
A click is heard, but the hatch does not open Jamming of the lock or the cable coming off the guide Remove the door trim and check the cable movement
The hatch opens but does not close Broken lock spring or deformed cover Inspect the lock for cracks

To check the electric drive:

  1. Remove the rear door trim (instructions below).
  2. Disconnect the connector from the activator and check the voltage at the contacts when pressing the button:
    • 🔋 On contact 1 there must be +12V (constantly).
    • 🔋 On contact 2 appears mass when you press a button.
  • If there is voltage, but the motor does not work, replace the activator (part number: 28510-4M00A for Terrano 2014–2020).

    • ⚠️ Attention: On Terrano with the system Nissan Intelligent Key (keyless entry) the gas tank flap can be blocked when the key fob battery is discharged. Try moving the key closer to the back door and pressing the unlock button.

    5. Repair and replacement of the gas tank flap cable

    If the diagnostics showed a break or stretching of the cable, it needs to be replaced. On Terrano a cable length is used 420 mm with plastic tips (item: 73901-4M000).

    Tools:

    • 🔧Torx T20 screwdriver
    • 🔧 Flat screwdriver (for clips)
    • 🔧Pliers
    • 🔧 WD-40 or silicone grease

    Step by step replacement:

    1. Remove the rear door trim: 
      1. Открутите 2 болта Torx T20 в нижней части двери.

      2. Подденьте отвёрткой пластиковые клипсы (их 6 штук).
      

      3. Аккуратно снимите обшивку, отсоединив разъёмы проводки.

    2. Disconnect the cable from the activator (it is secured with a plastic clip - squeeze it with pliers).
    3. Remove the fuel filler flap (unscrew the 4 Torx T20 bolts around the perimeter).
    4. Disconnect the cable from the lock and pull it out through the access hole.
    5. Install a new cable, lubricating it with silicone grease.
    6. Reassemble everything in reverse order.

    ⚠️ Attention: When installing the cable, make sure that it is not twisted or pinched by the casing. On Terrano 2019+, the cable is double braided - it must not be damaged, otherwise the cable will quickly wear out.

    💡

    If after replacing the cable the hatch is difficult to open, check the guide rollers in the door. On Terrano they often become clogged with dirt and require cleaning.

    6. Prevention: how to avoid hatch failure

    To make your gas filler flap last longer:

    • 🧴 Lubricate the lock silicone grease (for example, Liqui Moly Silicon-Spray) every 6 months. Do not use WD-40 - it washes out the factory lubricant!
    • ❄️ in winter Spray into the lock before refueling. defroster (For example, Hi-Gear Lock De-Icer).
    • 🚿 Wash the hatch under pressure at least once a month to remove dirt from the mechanism.
    • 🔧 Check the cable at every maintenance (especially if extraneous sounds are heard when opening).
    • 🔋 Keep an eye on your battery — at low voltage, the electric drive of the hatch may not work.

    On Terrano with mileage over 100,000 km recommended replace plastic cable guides (item: 73905-4M000). They wear out over time and pinch the cable.

    If you often drive off-road, install safety net on the gas tank flap (for example, from Nissan Original Accessories). It prevents dirt from entering the mechanism.

    7. Common mistakes during repairs and how to avoid them

    Many owners Terrano make critical mistakes that lead to repeated breakdowns:

    1. Using WD-40 to Lubricate the Lock → It washes away the factory lubricant and in winter the lock freezes even more.
      ⚠️ Attention: WD-40 is solvent, not lubricant! For locks, use only silicone or Teflon sprays.
    2. Sharp tugging of the cable → Causes plastic tips to break or become deformed.
    3. Replacing the cable without checking the guides → The new cable will wear out quickly if the rollers are clogged with dirt.
    4. Ignoring BCM Errors → If the gas tank light on the dashboard is on, but the flap is open, you need to reset the error using the scanner (for example, ELM327).

    Another common mistake is trying to open the hatch with a knife or screwdriver. On Terrano The gas cap is made of thin plastic and breaks easily. If the lock is jammed, it is better to remove the hatch completely (4 Torx T20 bolts) and unlock the mechanism from the inside.

    FAQ: Answers to frequently asked questions

    Is it possible to open the hatch if the button in the cabin is broken?

    Yes, use it emergency rope in the trunk (see section 3). If the cable also does not work, remove the rear door trim and manually pull the main cable or apply voltage to the electric drive.

    How much does it cost to replace a sunroof cable at a service station?

    Cost of work in the service - from 1,500 to 3,000 rubles (depending on the region). The cable itself will cost 800–1,200 rubles (original 73901-4M000). When replacing the activator, the price will increase to 5,000–7,000 rubles.

    Why does the hatch open but not close?

    This is a sign broken lock spring or cover deformation. Remove the hatch (4 Torx T20 bolts) and check:

    • Integrity of the spring (if broken, replace the lock, article number: 73900-4M000).
    • The condition of the plastic latches on the lid (sometimes they break from impacts).

    What to do if the hatch freezes in winter?

    Don't pour hot water! This will lead to re-freezing. Proceed like this:

    1. Buy lock defroster (For example, Hi-Gear or Liqui Moly).
    2. Spray into the crack of the hatch and wait 5-10 minutes.
    3. Pull the emergency cable (it can work even if the lock is frozen).
    4. If that doesn't help, warm up the lock. hairdryer (not open fire!).

    Is it possible to drive with a faulty sunroof?

    Technically yes, but this unsafe:

    • 🚨 Risk of fuel theft (the hatch can be opened with a screwdriver in 10 seconds).
    • 💧 Dirt and moisture getting into the tank (can damage the fuel pump).
    • 📋 At some traffic police posts they may issue a warning for a “malfunction that threatens safety.”

    Temporary solution: seal the hatch strong adhesive tape (For example, 3M Scotch) and secure with a clamp.