U0163 — Data Bus: Navigation Control Module – No Communication #

The code description may vary depending on the vehicle manufacturer (OEM). Below are known description variations:

• Navigation Control Module Communication Lost (Ford, GM)
• No Communication with Navigation Module (Toyota)
• Lost Communication With Navigation System (Chrysler)
• CAN Communication Error: Navigation Unit (Honda)

Summary for DTC U0163 #

The U0163 diagnostic trouble code (DTC) is set when a vehicle’s main computer, commonly called the Powertrain Control Module (PCM), detects a loss of communication with the Navigation Control Module through the vehicle’s data bus system. The data bus, typically a Controller Area Network (CAN) or similar communication platform, allows different electronic modules to exchange information. When this communication is interrupted, the PCM flags code U0163. While this issue often affects navigation functions, it can also impact other systems that rely on navigation data, such as driver assistance features or infotainment controls. Understanding the causes and proper diagnostics of this code can prevent unnecessary part replacements and ensure reliable vehicle operation.

Frequent Symptoms for DTC U0163 #

When U0163 is present, you may notice several issues related to the vehicle’s navigation and infotainment systems. In some cases, the problem may extend to related convenience or driver-assist features that depend on the navigation module. Common symptoms include:

• Navigation system is inoperative or displays a blank screen
• Infotainment features dependent on navigation (e.g., traffic data, map updates) do not function
• Driver information center shows error messages like “Navigation Not Available”
• Loss of voice guidance or route calculations
• Other modules may log communication or CAN bus codes
• Occasional battery drain if the module fails to shut down correctly

Probable Causes for DTC U0163 #

The most frequent causes for code U0163 relate to communication disruptions within the vehicle’s data network. These can range from simple connection issues to complete module failure. Listed in order of frequency:

1. Loose, corroded, or damaged wiring/connectors at the navigation module or in the CAN data bus
2. Faulty Navigation Control Module
3. Open or short circuit in the CAN bus wiring
4. Faulty or low vehicle battery voltage affecting module operation
5. Incorrect or failed software updates (especially after service or recall)
6. Other module faults causing bus interruptions (e.g., infotainment, gateway module)

Step-by-Step Diagnosis for DTC U0163 #

A systematic approach will help you pinpoint the source of communication loss and avoid unnecessary part replacement. Here are the recommended steps:

• Verify the DTC using a professional scan tool. Check for other related communication codes (U-codes).
• Confirm battery voltage is within specification (typically 12.4–12.7V engine off).
• Perform a visual inspection of the navigation module’s wiring harness and connectors. Look for loose, bent, corroded, or damaged terminals.
• Check for CAN bus integrity using an oscilloscope or multimeter to verify correct resistance (usually 60 ohms across CAN-H and CAN-L with ignition off and modules connected).
• Disconnect and reconnect the navigation module to ensure a good connection. Clear codes and see if communication is restored.
• Check for module power and ground at the navigation unit using a wiring diagram: confirm correct voltage and ground presence.
• If possible, substitute a known-good navigation module to rule out internal module failure (OEM or dealer-level step).
• Check for recent software updates or programming errors if the problem started after dealer service.

Possible Repairs for DTC U0163 #

Repairs should always address the root cause identified in the diagnostic process. Common solutions include:

• Repair or replace damaged wiring or connectors at the navigation module or along the CAN bus
• Replace the Navigation Control Module if confirmed to be faulty
• Restore proper battery voltage by charging or replacing the vehicle battery
• Correct software issues with proper reprogramming or updates through OEM tools
• Repair or replace other modules or components causing CAN bus interruptions

Can You Drive with Code U0163? #

Yes, but with limitations. Code U0163 does not typically affect the vehicle’s ability to start, drive, or operate critical safety systems. However, you will lose navigation functionality and any features that rely on navigation data (such as route guidance, traffic updates, or location-based driver assistance). If other communication codes are present, or if additional modules are affected, further diagnosis is warranted before continuing to operate the vehicle. Always address underlying wiring or power issues promptly to prevent cascading electrical failures.

Vehicles Most Commonly Affected by U0163 #

This code is seen across a wide range of OEMs, especially in vehicles equipped with factory navigation or advanced infotainment systems. While any modern car can set U0163, these models report it most often:

• Ford/Lincoln (with SYNC navigation)
• Chevrolet/GMC/Cadillac (with MyLink or CUE navigation)
• Toyota/Lexus (with Entune navigation)
• Chrysler/Jeep/Dodge (with Uconnect navigation)
• Honda/Acura (with factory navigation option)
• Volkswagen/Audi (with MMI navigation)

Common Mistakes & Best Practices for U0163 #

Mistakes in diagnosing or repairing U0163 often lead to wasted time and unnecessary expenses. To avoid these pitfalls, keep in mind:

• Do not replace the navigation module without verifying power, ground, and data connections first
• Don’t overlook battery condition—low voltage can trigger communication errors
• Always check for other related U-codes that may point to a broader CAN bus problem
• Use OEM wiring diagrams and module locations to avoid confusion
• Be aware of recent software updates or repairs that may have affected module programming

Express FAQ for DTC U0163 #

Q: Will clearing the code with a scanner fix the problem?
A: Clearing the code may remove the warning temporarily, but if the communication issue persists, it will return. Address the root cause first.

Q: Can a blown fuse cause U0163?
A: Yes. If the navigation module loses power due to a blown fuse, it will not communicate with the data bus, setting this code. Always check all related fuses.

Q: Is this code related to GPS signal issues?
A: No. U0163 points to a complete loss of communication with the navigation module—not just a GPS antenna or signal problem.