U2019 — Audio Voice Module Not Responding #

Note: The description for code U2019 may vary depending on the vehicle manufacturer (OEM).

• Audio Voice Module Not Responding (Ford, Lincoln, Mercury)
• Audio Control Module Communication Error (Jaguar, Land Rover)
• Multimedia Interface Module No Response (Mazda, Volvo)
• AVM Communication Lost (General Motors, select models)

Code Summary for U2019 #

The U2019 diagnostic trouble code (DTC) is a universal communication code defined by the OBD-II (On-Board Diagnostics II) standard. This code signals a loss of communication or non-response from the Audio Voice Module (AVM), a component responsible for managing audio and voice command functions in the vehicle. When the central control unit, often called the Body Control Module (BCM) or Gateway Module, cannot establish a data link with the AVM via the vehicle’s network (such as CAN bus), it logs U2019. This interruption can result from wiring issues, module failures, or software glitches. The code does not point to a specific fault but rather highlights a breakdown in the expected conversation between modules.

Common Symptoms for Code U2019 #

Vehicles with a stored U2019 code often display subtle to obvious changes in their multimedia or voice command systems. The driver might notice some convenience features are missing, or the infotainment system may behave unpredictably. While the car usually remains drivable, comfort and connectivity may be compromised.

• Voice command system unresponsive or unavailable
• No audio playback (radio, media, navigation voice)
• Touchscreen or infotainment display malfunctions
• Bluetooth hands-free system not functioning
• Warning messages about “Audio System Fault” or “Voice Module Not Detected”
• Intermittent loss of audio or voice guidance during navigation

Likely Causes for Code U2019 #

The U2019 code is most commonly triggered by disruptions in the communication network or faults within the Audio Voice Module itself. Issues may stem from physical wiring, module failure, or even outdated software. Here’s a prioritized list of probable causes, from most to least frequent:

1. Loose or corroded electrical connections at the Audio Voice Module or network harness
2. Faulty Audio Voice Module (internal failure or power loss)
3. Open or shorted CAN bus wiring (Controller Area Network lines broken or shorted)
4. Software or firmware incompatibility (outdated or corrupted software in AVM or BCM)
5. Blown fuse or relay controlling the AVM circuit
6. Incorrect retrofit or aftermarket device installation disrupting communication lines

Step-by-Step Diagnostic for U2019 #

Diagnosing U2019 requires a methodical approach, combining visual inspection and network testing. Because communication codes can be triggered by something as simple as a loose connector or as complex as a module software glitch, patience and attention to detail are key.

• Read all stored and pending DTCs using a professional OBD-II scan tool, and note if other U-codes (network-related) are present.
• Check for Technical Service Bulletins (TSBs) from the OEM regarding infotainment or network communication issues.
• Visually inspect the AVM and associated wiring/connectors for signs of corrosion, looseness, or damage.
• Test the relevant fuses and relays for the AVM circuit using a multimeter.
• Check CAN bus wiring for continuity and shorts between the AVM and BCM; repair as needed.
• Attempt a module reset: disconnect the car battery for 10 minutes, then reconnect.
• If available, use a scan tool to “ping” or directly communicate with the AVM; note if it responds.
• Update or reprogram AVM/BCM software via OEM procedures if a software issue is suspected.
• If all else fails, replace the Audio Voice Module and reprogram as per manufacturer instructions.

Possible Repairs for U2019 #

Once the root cause is identified, repairing U2019 may be straightforward or require specialized tools. Repairs may involve simple fixes like securing a loose connector or as involved as replacing and programming a new module.

• Secure or clean any corroded/loose electrical connectors at the AVM or relevant harnesses
• Replace blown fuse(s) and verify proper amperage rating
• Repair or replace damaged CAN bus wiring or connectors
• Update or reflash Audio Voice Module and/or Body Control Module software
• Remove incompatible aftermarket electronics interfering with the network
• Replace faulty Audio Voice Module and perform required OEM programming

Is it Safe to Drive with Code U2019? #

Yes, you can usually drive with code U2019 present. The vehicle’s core safety and drivability systems are not typically affected by a non-responding Audio Voice Module. However, you may lose access to voice commands, audio playback, or hands-free functions, which can impact convenience and driver focus. In rare cases, if U2019 is accompanied by other network errors, more serious symptoms may develop, so prompt diagnosis is still recommended.

Vehicles Most Commonly Affected by U2019 #

U2019 is most often reported in vehicles with advanced infotainment or multimedia systems, especially those using Ford-based architectures or sharing electronics platforms. The following vehicle families are more prone to this code:

• Ford (Focus, Fusion, F-150, Expedition, Explorer)
• Lincoln (MKZ, Navigator, MKX)
• Jaguar and Land Rover (XE, XF, Discovery, Range Rover Evoque)
• Mazda (6, CX-5, CX-9 with advanced infotainment)
• Volvo (S60, XC60, XC90, post-2010 models with voice/audio integration)
• Some GM models (Buick, Chevrolet, GMC SUVs with AVM modules)

Common Mistakes & Best Practices with U2019 #

Even experienced technicians can misinterpret communication codes like U2019. Avoiding common pitfalls and embracing best practices can save time and prevent unnecessary parts replacement.

• Do not replace the AVM without first verifying power, ground, and network integrity.
• Avoid overlooking TSBs—OEMs sometimes release targeted fixes for known network issues.
• Don’t ignore other U-codes; communication problems often affect multiple modules.
• Always disconnect the battery before unplugging or replacing modules to avoid data corruption.
• Use only OEM-approved parts and software updates to ensure compatibility.

U2019 FAQ #

Q1: Will clearing the code fix the problem permanently?
A: Clearing the code with a scan tool may restore audio or voice functions temporarily, but if the root cause (wiring, module fault, or software) is not addressed, the code will likely return.

Q2: Can aftermarket stereos trigger U2019?
A: Yes, installing non-OEM multimedia equipment can disrupt the vehicle’s communication network and cause U2019 or similar codes. Always use OEM-compatible devices and installation procedures.

If you have further questions or want to share your experience with code U2019, feel free to leave a comment below!