Error code B107315 on cars Škoda is one of those mysterious combinations that can make even experienced drivers nervous. It appears on the dashboard or in the diagnostic scanner, but is rarely accompanied by a clear description. Unlike common engine or transmission errors, this code refers to comfort system and is often associated with malfunctions central lock, window lifters or body control module (BCM).

Feature B107315 is that it can manifest itself in different ways: from the random alarm going off to the complete refusal of the doors to lock. In some cases, the error occurs after replacing the battery, updating the firmware, or even after washing the car. In this article we will look at unique reasons for B107315 appearing on models Octavia, Superb and Kodiaq (2018–2026), and we will also give clear instructions for diagnostics and repairs - from simple checks to complex procedures that require the intervention of specialists.

What does error B107315 mean on Škoda?

Code B107315 in the self-diagnosis system Škoda refers to Malfunction of the central locking control circuit or related components. In the manufacturer's technical documentation it is deciphered as Terminal 30 Power Supply — Short to Ground (short circuit to ground in the power supply circuit of terminal 30). This means that somewhere in the electrical circuit responsible for locking the doors, a current leak or short circuit has occurred.

It is important to understand that B107315 - this is not an independent breakdown, but symptom deeper problem. It can be caused by:

  • 🔋 Malfunction Body Control Module (BCM/J519) - the “brain” that controls all electrical functions of the car.
  • 🚪 Damage to wiring in doorways (wires often fray due to constant opening/closing).
  • 🔌 Short circuit in central locking actuators (motors that block doors).
  • ⚡ Problems with fuses or relay in the mounting block (for example, fuse S30).

Interestingly, on some models (for example, Škoda Kodiaq 2020) this error may be accompanied by additional codes such as B107314 (open circuit) or U111300 (communication problems with BCM). If you see several errors at the same time, most likely the problem lies in control unit or chan.

📊 On which Škoda model did you encounter error B107315?
  • Octavia
  • Superb
  • Kodiaq
  • Karoq
  • Other model

Typical symptoms of error B107315

Error B107315 rarely appears “on its own” - it is usually accompanied by noticeable changes in the operation of the car. Here are the most common signs:

  • 🔐 Central locking is not working properly: Doors lock/unlock randomly or do not respond to the remote control.
  • 🚨 Alarm Triggers for no reason, especially at night or when the temperature changes.
  • 🔌 Window lifters stop working or move jerkily.
  • 💡 Lights up on the dashboard key icon or exclamation point in the red triangle.
  • 🔋 The battery discharges faster than usual (due to constant current consumption by the faulty circuit).

On Škoda Octavia 4th generation (2020–2023) error B107315 sometimes manifests itself as spontaneous opening of the trunk or turning off the heated seats. This is because the BCM not only controls the locks, but also other convenience functions.

⚠️ Attention: If together with B107315 a message appears on the on-board computer screen "Safe Mode Active", this means that the BCM has entered emergency mode. In this case It is not recommended to disconnect the battery - this may lead to loss of adaptations (for example, window or mirror settings).

Causes of error B107315

To effectively resolve an error, you need to understand its root cause. Below we will analyze the most common scenarios, from the simplest to the most complex.

1. Problems with wiring in doorways

The most vulnerable spot is wiring harness, passing from the body to the door through rubber corrugation. Due to constant bending when opening/closing the door, the wires fray, which leads to a short circuit. Most often they suffer:

  • 🚗 Driver's door (due to frequent use).
  • 🚪 Rear right door (on Škoda Kodiaq and Superb due to design features).

2. Malfunction of the body control module (BCM)

If the wiring is good, the next weak link is BCM module (J519). It may fail due to:

  • ⚡ Voltage changes (for example, when “lighting” from another car).
  • 💧 Moisture ingress (on Škoda Octavia The 3rd generation BCM is located under the front panel where condensation can accumulate).
  • 🔄 Unsuccessful firmware update (for example, after dealer service).

3. Short circuit in lock actuators

Actuators (motors that lock doors) wear out over time and their internal contacts can short out. This is especially true for cars older than 5 years or with mileage >150,000 km. On Škoda Karoq and Kodiaq The actuator often fails fifth door (trunk).

4. Problems with fuses and relays

The fuses responsible for the central locking are located in the mounting block (usually under the steering wheel or in the glove compartment). For B107315 critical:

  • S30 (10A) - BCM power supply.
  • S50 (20A) - chain of lock actuators.

If a fuse is blown, replacing it may temporarily solve the problem, but if it blows again, look for short circuit in the chain.

Reason Škoda models where it occurs most often Diagnostic method
Damage to the wiring in the door corrugation Octavia (2013–2020), Superb (2015–2023) Visual inspection, multimeter check
BCM Malfunction (J519) Kodiaq (2017–2026), Karoq (2018–2026) Diagnostics with a scanner (checking for errors in other systems)
Short circuit in the lock actuator Rapid (2012–2020), Scala (2019–2026) Shift shutdown of actuators to identify faulty
Blown fuse S30/S50 All models Checking the mounting block

How to diagnose error B107315 yourself

If you have diagnostic scanner (for example, VCDS, OBDeleven or Launch X431), you can conduct an initial check yourself. Here are the step-by-step instructions:

1. Connect the scanner to the OBD-II connector (usually under the steering wheel)

2. Select your car model and go to the "Body" section

3. Check for errors in the BCM (J519)

4. Remove error B107315 and see if it appears again

5. If the error returns, proceed to check the wiring -->

If you don't have a scanner, start with visual inspection:

  1. Open driver's door and inspect the rubber corrugation between the door and the body. Look for cracks or scuffs.
  2. Check fuses S30 and S50 in the mounting block (the diagram is usually indicated on the block cover).
  3. Try manually locking/unlocking all doors. If one of them does not respond, the problem is most likely in its actuator.

On Škoda Superb 3rd generation (2015–2023) error B107315 sometimes accompanied steering wheel heating failure. This is because the BCM controls this function as well. If you notice such a symptom, most likely the problem is in control unit or LIN bus.

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If, after the scanner resets the error, it appears again after 1–2 minutes, this almost always indicates short circuit in the circuit. Don't waste time replacing fuses - look for a damaged wire or a faulty actuator.

Step by step troubleshooting for error B107315

Depending on the cause, repair methods will vary. Below we provide instructions for each case, starting with the simplest.

1. Replacing the fuse

If the problem is a blown fuse:

  1. Find the mounting block (on Octavia he's driving Kodiaq - in the glove compartment).
  2. Remove the fuse S30 (10A) or S50 (20A) and check for integrity.
  3. Install a new fuse same denomination.

If the fuse blows again - Do not install a fuse of a higher rating! This may cause the wiring to catch fire.

2. Repair of wiring in the doorway

To do this you will need:

  • Remove the door trim (unscrew the bolts and latches).
  • Find the damaged section of the wire (usually white with black stripe or purple wire).
  • Insulate or replace the damaged area using heat shrink tube.
How to check wiring with a multimeter

1. Disconnect the battery (negative terminal first!).

2. Set the multimeter to resistance test mode (200 ohms).

3. Connect the test leads to the ends of the wire being tested.

If the resistance is < 1 ohms, the wire is intact.

If resistance = 0 ohms, short circuit.

If resistance = ∞ (infinity) - cliff.

4. Check the circuit for current leakage: one probe per wire, the second for the mass. If there's a current, there's a circuit somewhere.

3. Replacement of the central lock actuator

If the problem is in the lock motor:

  1. Remove the door trim.
  2. Disconnect the actuator connector and check it with a multimeter (resistance should be ~10-20 Ohms).
  3. If the actuator is defective, replace it with a new one (article for the Škoda Octavia: 5Q0 837 015 for front doors).

4. Reflashing or replacing the BCM block

If all previous steps have not worked, the problem is likely to be body-control. There are two options here:

  • 🔄 BCM flashing (Dealer equipment or specialized service is required).
  • 🔧 Replacing the block (Expensive, but sometimes inevitable) Nana Škoda Kodiaq BCM block costs ~50,000-70,000 rubles.
⚠️ Attention: Replacement of BCM will be required block registration The vehicle is sent to the vehicle through a diagnostic scanner. Without it, new keys won’t work, and some features (e.g., the new keys won’t work). keyless entry) will be shut down.

Service repair cost

Prices for fixing errors B107315 It depends on the cause and model of the car. Below are the approximate prices for Moscow and St. Petersburg (2026):

Type of work Cost (rubles) Lead Time
Diagnostics with a scanner 1 500–3 000 30–60 minutes
Replacing the fuse Free (if you do it yourself) or 500-1000 10 minutes
Repair of wiring in the doorway 3 000–6 000 1–2 hours
Replacement of the lock actuator (1 door) 4,000–8,000 (with work) 1–1.5 hours
BCM flashing 5 000–12 000 2–3 hours
Replacement of BCM block (with residence permit) 40 000–80 000 4–6 hours

On Škoda Enyaq The cost of repairs can be higher by 20-30% due to the features of the high-voltage system. In addition, some services charge an additional fee for working with electric vehicles.

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If you are not sure about the cause of the error, start with the diagnosis in the service. Improper repairs (e.g., replacing BCM without checking wiring) can result in even more expensive repairs.

Frequent questions about the B107315 error

Can I drive with a B107315 error?

Technically yes, but it is not safe. An error can lead to:

  • 🔓 Unintentional opening of doors on the move.
  • 🔋 Battery discharge (if the circuit consumes current continuously).
  • 🚨 Alarm failure.

If the error has appeared recently and is not accompanied by other symptoms, you can reach the service. But if the doors are blocked arbitrarily, it is better to call a tow truck.

Why does the error appear after replacing the battery?

When the battery is turned off, the BCM unit may reset or lose communication with other modules. Nana Škoda Octavia 4th generation, this often leads to a mistake. B107315, if:

  • 🔋 The new battery has a smaller capacity.
  • ⚡ There was a snag (even a short-term one) when it was connected.
  • 🔄 Not implemented battery adaptation through a scanner.

Solution: Reset the BCM (turn off the battery for 10 minutes) or contact the service for adaptation.

Can I reset B107315 without a scanner?

Yes, but this is a temporary solution. Methods:

  1. Disable negative battery terminal for 15–20 minutes.
  2. Press and hold the button central lock The key is used for 10 seconds (sometimes it will drop the error).

If the cause of the error is not fixed, it will return within a few miles.

What other errors can occur with B107315?

Frequent "companions":

  • B107314 - a circuit break of terminal 30.
  • U111300 - loss of communication with BCM.
  • B112823 Failure of the actuator driver.
  • B104F13 - LIN tyre error (on Škoda Superb).

If you see a few errors on this list, the problem is likely to be block or wiring.

Where is the BCM block on the ŠKODA Octavia?

On Octavia 3rd and 4th generations of body control unit (BCM/J519) located:

  • 🚗 Octavia 3 (2013–2020): behind the glove box ( glove compartment), you need to remove its cover.
  • 🚗 Octavia 4 (2020–2026): under the front panel on the driver's side, next to the safety lock block.

To get to BCM, you will need to remove the plastic lining and disconnect the connectors.