Many owners of Volkswagen group cars, especially models Škoda Octavia and Škoda Octavia A5, are faced with a frightening situation where a bunch of icons on the dashboard light up and the diagnostic scanner shows an error code 01336. This error, labeled as “Chassis Power Circuit Malfunction” or “CAN Data Link”, often leads to complete failure of the central locking, power windows and even the air conditioning system. Panic in such a situation is quite understandable, since the car loses some of its functionality and stops responding to keys.
However, the problem is not always fatal to the engine or transmission. Most often, it lies in the electrical circuit of the comfort unit, which is responsible for controlling door locks, lights and other amenities. Understanding the nature of this error allows the owner Škoda do not spend extra money on replacing expensive components if it is enough to simply clean the contacts or check the fuse.
⚠️ Attention: If error code 01336 is accompanied by a complete loss of power to the passenger compartment, immediately check the 30A fuse in the box under the hood, as this may indicate a short circuit in the wiring.
The Problem and the Role of the Data Chassis
Error 01336 is not a breakdown of one specific sensor, but a signal that the control unit cannot exchange data with other vehicle components via a high-speed bus CAN. In modern cars Škoda a complex network is used, where each electronic unit (engine, ABS, airbags, comfort) is a node in this network. If one of the nodes is silent or sends incorrect data, the entire system records a failure.
The main culprit for this error is most often the block BCM Body Control Module or Comfort Unit. It acts as the main gateway for controlling door locks and light. When the power supply on this unit drops below the critical level or contact disappears, it “falls out” from the network, and other blocks begin to issue a communication error with it.
⚠️ Note: Do not try to reset the 01336 error by simply turning off the battery for a long time, as this can lead to loss of adaptability of windows and the need to retrain them.
The main reasons for the failure
There are several key factors that lead to the emergence of code 01336 in diagnostic systems. Škoda. The most common cause is oxidation or mechanical damage to the contacts in the comfort unit connector. Moisture penetrating into the cabin through loose seals of doors, over time corrodes thin tracks in the chip, violating the integrity of the supply chain.
The second common problem is the burnout of the fuse responsible for powering the chassis control unit. Depending on the model and year of release, this fuse can be in the block under the hood or in the cabin behind the instrument panel. If the current consumption of the block increases sharply due to a short circuit in the door wiring, the fuse is triggered, cutting off the power supply.
⚠️ Attention: Regularly checking the condition of door seals and drainage holes at the bottom of the doors can prevent moisture from entering and subsequent oxidation of the connector contacts.
Additional risk factors
- 🔋 Low battery: At low voltage on-board network, the units may shut down or operate unstablely, causing false CAN bus error.
- 🔌 Wiring damageMice or corrosion can damage the wire harness running from the comfort unit to the driver's door, which breaks the ground circuit.
- 💻 Software failure: In rare cases, the firmware of the control unit requires an update to work correctly with other nodes.
- Central locking failure
- Problems with power windows
- All the lights are on.
- Error on the onboard computer screen
Diagnostics and troubleshooting
The first step in eliminating error 01336 is a high-quality computer diagnostics using equipment that can read the error codes of all blocks, for example, the computer system is used to detect the error codes of all blocks. VAS-PC or VCDS. Conventional cheap scanners can only show the code, but will not decrypt the status of contacts. You need to check which blocks are not responding to requests and whether there is a power (12V) or grounding (Ground) error.
It is important to check not only the unit itself, but also the integrity of the wiring. Particular attention should be paid to the wire harness passing in a rubber corrugated between the body and the driver's door. This is where wires are often broken from the constant opening and closing of the door.
☑️ Wiring check
Stages of visual inspection
- 🔍 Inspection of the connector: Unplug the connector from the comfort unit and carefully inspect the contacts for corrosion, soak or traces of moisture.
- 📏 Checking fuses: With the multimeter, make sure that the fuse responsible for the comfort unit (usually 30A) is intact and has no signs of overheating.
- 🔧 Grounding checkFind the grounding point of the block, clean it of paint and rust, then tighten the bolt securely to ensure reliable contact.
Troubleshooting Methods
If the reason lies in the oxidation of contacts, it is enough to clean them thoroughly with a special contact cleaner and apply a conductive lubricant. This will restore normal contact and allow the block to see the network again. In some cases, a simple reconnection of the connector helps, but only after cleaning.
In case of a fuse burnout, it is necessary not only to replace it with a new one, but also to find the cause of the short circuit. If you put a fuse of a larger denomination, this can lead to a fire of the wiring. The most critical point is to check the current leakage in the wiring of the driver's door, since it is here that the mass circuit most often occurs.
If the diagnosis showed that the control unit itself failed (for example, the power transistor inside burned), it will need to be replaced or professionally repaired. When replacing the new unit, it is necessary to conduct coding and adaptation, otherwise the car will not work correctly.
What should I do if the error returns after a reset?
If error 01336 is returned immediately after reset, it means that a physical fault in the power or ground circuit has not been fixed. It is necessary to repeat the check of fuses and integrity of the wiring, paying special attention to the contacts in the connector of the comfort unit.
Software techniques and adaptation
After eliminating the physical causes of the failure, you must reset the error via the diagnostic interface. To do this, use the adaptation command or the “Reset Errors” function in the software. It is important to make sure that all units have stopped generating errors and communication via the CAN bus has been restored.
Some models Škoda A power window initialization procedure may be required. If they do not work after resetting the error, lift the glass all the way up and hold the button for another 3-5 seconds, then lower it all the way and hold the button down. This will restore the power window position memory.
Table of typical fuses to check
| Model | Fuse number | Location | Purpose |
|---|---|---|---|
| Octavia A5 | S136 | Under the hood | Comfort block power supply |
| Octavia A7 | S32 | Inside (side panel) | Central lock |
| Superb II | S105 | Under the hood | CAN data bus |
| Yeti | S230 | Inside | Door control unit |
Before starting work, be sure to disconnect the negative terminal of the battery to avoid an accidental short circuit when removing the comfort unit connector.
Regular contact prevention and checking the integrity of the wiring in door hinges can prevent the occurrence of error 01336 and save money on expensive repairs.
Prevention and operating tips
To avoid reoccurrence of the error, it is recommended to regularly inspect the condition of the wiring at bend points. Over time, rubber corrugations harden and crack, opening access to the wires. They can be replaced with new ones or carefully wrapped with electrical tape and heat shrink to provide additional protection.
It is also worth monitoring the condition of the battery. A deep discharge can lead to malfunctions of electronic components. Use a quality charger and do not leave the car with the lights on for long periods of time.
Recommended actions for owners
- 🛡️ Using moisture protection: Treat the contacts of the comfort unit connector with a special anti-corrosion liquid once a year.
- 🔋 Voltage control: Monitor the voltage of the on-board network; it should not fall below 12V when the engine is turned off.
- 🔧 Timely diagnosis: When the first signs of central locking failure appear, check immediately without waiting for a complete loss of communication.
Is it possible to drive with error code 01336?
Technically, the car can move as the fault does not affect the engine, but this is dangerous due to the possible failure of the central locking, lack of lights or power windows, which reduces safety and comfort.
When to turn to professionals
If self-diagnosis does not reveal obvious causes, such as a blown fuse or oxidized contacts, the problem may be deeper. Malfunctions in the operation of the control unit itself require sophisticated equipment for flashing or soldering components. In such cases, it is better to entrust the matter to electronics specialists.
You should also not try to replace the control unit yourself without coding. A new unit without adaptation will not “understand” keys, alarms and other car systems, which will lead to even greater problems.
Conclusion
Error 01336 in cars Škoda - This is a common problem that is most often solved by restoring contact in the power supply circuit of the comfort unit. Understanding the CAN bus structure and the ability to carry out basic diagnostics allows owners to independently eliminate the cause of the failure and avoid costly repairs at the dealer.
The main thing is not to ignore the car signals. Early intervention and prevention will help maintain the functionality of all your electronic systems. Škoda for many years. Regular inspection of the wiring and cleanliness of contacts is the key to stable operation of the on-board network.
What does error 01336 mean in Škoda?
Error 01336 indicates a failure in communication via the CAN bus or a lack of power to the control unit, most often this is the comfort module (BCM), which is responsible for the central locking and power windows.
How to quickly reset error 01336?
Resetting is possible through a diagnostic scanner (VCDS, VAS-PC) after eliminating the physical cause of the failure. Simply disconnecting the battery often does not help.
Is it possible to drive with this error?
You can drive, but it is not recommended, as the central locking, power windows or lighting may fail, which reduces safety and comfort.
Which fuse is responsible for error 01336?
In different models these are different fuses, most often it is a 30A fuse located in the block under the hood (for example, S136 for Octavia A5) or in the passenger compartment.
Why does the error appear again after a reset?
If the cause (wire break, oxidation, short circuit) is not eliminated, the error will return immediately after turning on the ignition. It is necessary to find and repair the wiring fault.