U0164 — Data bus: NC control module – no communication

Introduction:
The diagnostic trouble code U0164 indicates a communication failure between the vehicle’s electronic control modules (ECMs). Specifically, it signals that the Northbound Control Module (NC), which is often responsible for safety, infotainment, or body control functions, is not transmitting or receiving data as expected. This problem can cause various systems to malfunction or become unresponsive. Note that the exact terminology and label may vary depending on the vehicle manufacturer, as each OEM might have their own code definitions.

Fast Facts

System affected: Data communication network / CAN bus
Severity: Moderate to high, depending on affected modules
Main symptoms: Communication errors, malfunctions of controlled systems
Driveability: Limited or no impact, but safety-critical features might be affected

Manufacturer variations for trouble code U0164

Different vehicle manufacturers may label or assign similar codes with their own identifiers. The code U0164 generally refers to a communication network problem involving the NC control module, but the exact code label can vary. Here are some known variations:

For Volkswagen Group:
U0164 00
For Ford:
U0164 (sometimes referenced as communication fault with body control module)
For BMW:
U0164 00
For Mercedes-Benz:
S耐 U0164 (although Mercedes may use different structure)
For Hyundai/Kia:
U0164 (semantic equivalence, sometimes with additional characters)

What does trouble code U0164 mean?

U0164 is a generic OBD-II code that indicates there is no communication with the NC control module. This module is part of a vehicle’s data bus network—typically a Controller Area Network (CAN)—which allows various control units to share information. When communication breaks down, the ECU (Engine Control Unit) detects that the NC control module isn’t transmitting or responding to requests.

This code is usually triggered when the ECU repeatedly fails to receive expected data packets from the NC module, or when the module itself becomes unresponsive. The appearance of U0164 often coincides with other communication-related trouble codes or malfunction indicators in the vehicle’s systems.

In many cases, U0164 appears in situations where wiring becomes damaged, connectors are loose, or the module has experienced internal failure. Sometimes, it occurs after a fault in the vehicle’s control network or following repairs involving a network component.

Severity and risks of trouble code U0164

The severity of U0164 depends on which system the NC control module manages. If it is a critical system, such as safety-related functions or vehicle stability, the risk can be significant. Other times, it may only affect comfort or convenience features, which are less urgent.

Potential risks include:

Loss of functionality of the affected systems (e.g., lighting, airbags, infotainment)
Reduced safety if essential modules—like stability control—fail to communicate
Potential for further electrical issues if wiring problems cause communication failures

Despite these risks, most vehicles can still be driven with this code present, especially if the malfunction does not affect critical safety features. However, it’s advised to diagnose and resolve the issue promptly to avoid unexpected system failures.

Yes, in most cases, the vehicle can be driven for a limited period, but safety-critical functions might be compromised.

Symptoms of trouble code U0164

The symptoms associated with U0164 are often subtle and may be non-specific, focusing mainly on the malfunction of systems relying on the data bus network.

Intermittent or persistent warning lights on the dashboard, especially related to systems managed by the affected module
Malfunction or non-functionality of features like lighting, windows, door locks, or infotainment
Loss of responsiveness in modules that should be communicating with the NC module
In some cases, other codes related to CAN bus or communication errors appear

Most likely causes of trouble code U0164

Understanding what causes U0164 can guide effective repairs. Below are the most common causes, listed from most to least likely:

Faulty or damaged wiring or connectors: A break or short in the wiring harness connecting the NC module can interrupt communication.
Corrupted or failed NC control module: The module itself may have internal issues or component failure preventing communication.
Software glitches or outdated firmware: Sometimes, a software bug or the need for an update can cause communication failures.
Power supply issues: Insufficient voltage or power interruptions to the NC module may lead to communication loss.
Other module failure or network issues: Problems elsewhere on the bus, such as damaged Gateway modules or other ECUs, can affect communication with the NC module.

How to diagnose trouble code U0164

Precise diagnosis helps avoid unnecessary repairs. The following steps are generic and apply across most vehicles:

Visual Inspection: Check wiring harnesses, connectors, and grounds related to the NC control module for obvious damage, corrosion, or loose connections.
Scan for additional codes: Use an OBD-II scanner to identify other communication-related codes that might point to root causes.
Check live data: Monitor CAN bus signals and see if the NC module responds or if there is data transmission activity.
Inspect power supply: Measure voltage at the NC module’s power input to verify correct operation.
Conduct continuity tests: Test wiring for opens, shorts, and resistance issues from the control module to other modules or ground.
Perform module reinitialisation or software update: If supported, update the module firmware or perform a reset procedure as specified by the manufacturer.

Possible repairs for trouble code U0164

Depending on the identified root cause, repairs can range from simple to complex. The following are typical solutions:

Repair or replace damaged wiring or connectors: Basic repair carried out by a knowledgeable technician or home mechanic.
Reprogram or update the NC control module: Professional diagnosis with OEM-compatible diagnostic tools.
Replace the NC control module: When the module itself is faulty and cannot be reprogrammed. Requires professional handling.
Address power supply issues: Repair or replace affected wiring, fuse, or relay to ensure consistent power supply.
Resolve network issues elsewhere on the CAN bus: In-depth diagnosis by a professional may be necessary to locate and fix faults in the wider communication network.

Vehicles commonly associated with trouble code U0164 in Europe

The U0164 code appears in various makes and models, especially those with complex communication networks. In Europe, common affected brands include:

Volkswagen Group: Volkswagen, Audi, Seat, Skoda.

Ford: Focus, Fiesta, Mondeo.

BMW: 1 Series, 3 Series, 5 Series.

Mercedes-Benz: C-Class, E-Class, S-Class.

Hyundai/Kia: Hyundai Elantra, Kia Sportage.

Frequent mistakes with trouble code U0164

Diagnosing and repairing U0164 requires care; typical mistakes include:

Overlooking interconnected issues in the wiring harness or connectors
Replacing modules without verifying wiring or network integrity
Ignoring software related causes, such as outdated firmware or corrupted configuration
Assuming the module is always at fault without thorough diagnostics
Failing to perform a complete vehicle scan for additional codes, leading to incomplete repairs

FAQ — trouble code U0164

Q1: Can this code disappear on its own?
A1: Usually not. Once a communication failure occurs, it remains until the underlying cause is fixed. However, sometimes, temporary glitches may resolve temporarily but tend to reappear if the root issue persists.

Q2: Can I keep driving?
A2: In many cases, yes, especially if the code is not related to critical systems. However, if communication failure affects safety features or essential functions, driving is not recommended without diagnosis and repair.

Q3: Why does the code return after clearing?
A3: The root cause—such as wiring issues, faulty modules, or system faults—remains unresolved, so the communication error reoccurs. Proper diagnostics are required to identify and fix the underlying issue.