Lost Communication with Voice Recognition Module
The U0263 code indicates that a master control module (such as the BCM, infotainment module, or gateway) has detected a loss of communication with the Speech Recognition Module (SRM) over the vehicle's serial data bus, typically CAN or LIN. This interruption prevents the exchange of status messages and commands between the SRM and the rest of the network, disabling voice control functions. The fault is limited to comfort and multimedia systems and does not directly affect propulsion, braking, or active safety systems.
1. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.
2. Most Common Causes
- Open, short-to-ground, short-to-power, or excessive resistance in the CAN/LIN data bus circuit between the SRM and the main network
- Disconnected, corroded, bent, or retracted pins, or moisture ingress in the SRM connector
- Faulty power supply or ground circuit to the SRM
- Internally defective SRM or corrupted software
- Faulty gateway module disrupting communication with the SRM
3. Symptoms You Will Notice
- Voice control functions (e.g., hands-free calling, voice commands) are inoperative
- Infotainment system may display a communication error message
4. Step-by-Step Diagnosis
Scan for other communication-related codes to identify the affected network
Inspect the SRM connector for damage, corrosion, or loose pins; check wiring for opens or shorts
Verify power and ground at the SRM connector
Test bus resistance and signal integrity at the SRM with a multimeter or oscilloscope
If all else is normal, attempt to reprogram or replace the SRM
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is safe to drive. The code only affects voice control and comfort features; the vehicle's drivetrain, brakes, and safety systems remain fully operational.
How much does it cost to fix?▼
The repair cost typically ranges from $100 to $600, depending on whether the issue is a wiring repair (low end) or SRM replacement (high end). Diagnostic fees may add $100–$200.