U0164 — Data Bus: NC Control Module – No Communication #

Note: The code description may vary depending on the vehicle manufacturer. Always consult your OEM (Original Equipment Manufacturer) service information for precise terminology.

• “NC Control Module – No Communication” (General/Multiple OEMs)
• “No Communication with Navigation Control” (Toyota/Lexus)
• “Lost Communication with Navigation/Climate Control Module” (Ford/Lincoln)
• “Data Bus: Navigation Control Module – No Signal/Communication” (Volkswagen/Audi)

Summary of DTC U0164 #

The U0164 diagnostic trouble code (DTC) indicates that the vehicle’s main computer, commonly known as the PCM (Powertrain Control Module), has lost communication with the NC (Navigation Control) module over the vehicle’s CAN bus (Controller Area Network: the digital “nervous system” that interconnects electronic modules). This code signals a digital “silent treatment”—the PCM tried reaching the NC module, but received no reply. While this might sound minor, modern vehicles rely on constant data sharing between modules for optimal performance and user convenience.

This DTC does not point to a single faulty part; rather, it indicates a breakdown in digital conversation, which could stem from wiring, connectors, or even failed control units. Symptoms can vary from barely noticeable to significant inconvenience, depending on which systems depend on the navigation control module data.

Because communication codes like U0164 often have multiple potential triggers, accurate diagnosis is key. Understanding the code’s context—especially which systems are affected—will help ensure a swift and cost-effective repair.

Frequent Symptoms for DTC U0164 #

When the U0164 code appears, the most noticeable issues typically involve user interface and convenience features, particularly those related to navigation, infotainment, or climate controls if integrated. However, some symptoms may be subtle or intermittent, depending on how your specific vehicle’s systems are networked.

• Navigation system unavailable or unresponsive
• Infotainment or display screen freezing or blanking out
• Loss of voice control or touch screen functionality
• Climate control system not responding to inputs (in some models)
• Warning lights or error messages on the instrument cluster
• Bluetooth, radio, or audio system malfunctions
• Delayed system startup or random reboots

Most Likely Causes for Code U0164 #

The root cause of U0164 is typically a breakdown in the communication pathway between the PCM and the NC module. The following are the most common culprits, listed by frequency:

1. Faulty or loose connectors at the navigation control module or PCM
2. Damaged, shorted, or corroded CAN bus wiring (twisted pair wires that carry data between modules)
3. Failed navigation control module (internal fault)
4. Failed PCM or gateway module (less common)
5. Secondary faults caused by low battery voltage or recent jump starting
6. Aftermarket accessories interfering with CAN bus communication

Step-by-Step Diagnostic Procedure for U0164 #

Pinpointing the exact cause of a U0164 code requires a methodical approach. Rushing to replace modules rarely solves the issue—and can be costly. Here’s a structured path to follow:

1. Check for additional DTCs — Scan all modules for related codes; communication issues often trigger multiple codes.
2. Verify battery voltage and charging system health — Low voltage can disrupt network communication.
3. Perform a visual inspection of wiring and connectors at the navigation control module, PCM, and any in-line connectors — Look for corrosion, bent pins, loose connections, or signs of water intrusion.
4. Test CAN bus wiring for continuity, shorts to ground, and shorts to power — Use a multimeter and refer to the OEM wiring diagram.
5. If possible, use a scan tool to check if the navigation control module is detected on the network — If not, attempt a module reset or re-initialization per OEM procedure.
6. Substitute a known-good module (if available) to confirm a suspected module failure — Only after all wiring and power/ground checks pass.
7. Re-examine for aftermarket equipment interfering with data lines — Remove or isolate as needed.

Potential Repairs for U0164 #

Repairing a U0164 code always starts with addressing the underlying cause, not just clearing the code. Depending on your diagnostic results, possible repairs include:

• Repair or replace damaged CAN bus wiring or connectors
• Clean, tighten, or replace corroded or loose module connectors
• Replace the navigation control module if confirmed faulty
• Update or reflash module software per OEM technical service bulletin (if applicable)
• Replace PCM or gateway module (rare; only with proper confirmation)
• Remove or correct improperly installed aftermarket electronics
• Restore battery voltage and ensure proper charging system operation

Is It Safe to Drive with Code U0164? #

Limited—proceed with caution. In most cases, code U0164 won’t directly affect engine performance or basic vehicle safety. However, you may lose access to navigation, infotainment, or climate controls, which can reduce comfort and driver convenience. On some vehicles, additional safety or driver-assist features (such as backup cameras, voice commands, or hands-free systems) may be impacted. If you rely heavily on these features, or if you notice additional warning lights or symptoms, it’s best to have your vehicle professionally inspected before continued use.

Vehicles Most Commonly Affected by U0164 #

While U0164 can appear on any vehicle equipped with a networked navigation control module, OEMs using sophisticated infotainment systems are more commonly affected. Based on service data and technician reports, the following makes and models see this code most often:

• Toyota and Lexus models with integrated navigation (2010–2020)
• Ford and Lincoln vehicles (2011–2019, SYNC and MyFord Touch systems)
• Volkswagen and Audi models with MMI navigation (2012–2022)
• Honda and Acura vehicles with advanced infotainment (2012–2018)
• General Motors (Chevrolet, GMC, Cadillac) with MyLink/IntelliLink (2011–2017)
• Some BMW and Mercedes-Benz models with COMAND or iDrive (2014+)

Frequent Mistakes & Best Practices for Code U0164 #

It’s easy to get sidetracked with communication codes. Avoid these common pitfalls and follow these best practices:

• Do not replace the navigation control module without first checking wiring and connectors
• Do not ignore battery and charging system issues—they can cause or mimic communication faults
• Always scan all modules, not just the PCM, for a complete picture of the network health
• Use OEM wiring diagrams and diagnostic procedures; aftermarket tools may miss network nuances
• Be wary of aftermarket device installs—these often tap into CAN lines and can cause intermittent issues
• Document all steps and findings for future reference and warranty claims

Express FAQ for DTC U0164 #

Let’s clear up some common concerns and questions about this code:

• Q: “Can I just clear the code and see if it comes back?”
  A: Clearing the code without fixing the root cause is only a temporary solution. The code will likely return if the underlying issue isn’t addressed.
• Q: “Will replacing the navigation screen fix the problem?”
  A: Not necessarily. The screen is often just the user interface, not the actual controller. The issue could be in wiring, connectors, or the control module itself.
• Q: “Will this code affect my car’s ability to pass inspection?”
  A: In most states and countries, U-codes (communication codes) do not directly cause emissions test failures, but some regions check for unresolved DTCs in any system.
• Q: “Can a dead battery or jump starting cause U0164?”
  A: Yes, low voltage or sudden power loss can trigger network codes. Always check and restore proper battery voltage before further diagnosis.