Lost Communication with Rear Seat Entertainment Module
Diagnostic trouble code U0196 indicates that the main control module (typically the infotainment unit, gateway, or body control module) has lost serial communication over the CAN bus with the Rear Seat Entertainment (RSE) module. The system expects periodic heartbeat or data messages from the RSE module, and if these are not received within a calibrated time, this code is set.
1. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.
2. Most Common Causes
- Open circuit, short to ground, or short to battery on the CAN bus (CAN High/Low) wiring to the RSE module
- Damaged, loose, corroded, or pushed-back terminals in the RSE module connector
- Internal failure of the Rear Seat Entertainment (RSE) module
- Loss of power (B+) or ground to the RSE module (blown fuse, damaged power wiring)
- Missing or defective CAN bus termination resistor
- Software error or data corruption in the RSE module or master module
3. Symptoms You Will Notice
- Rear seat entertainment system inoperative or unresponsive
- Infotainment system may display a communication error message
4. Step-by-Step Diagnosis
Check for blown fuses supplying the RSE module and verify battery voltage and ground at the module connector
Inspect the CAN bus wiring (CAN High and CAN Low) for opens, shorts, or damage between the master module and RSE module
Examine the RSE module connector for bent, corroded, or pushed-back terminals
Test the CAN bus termination resistance at the RSE module (should be approximately 60 ohms with other modules connected)
If wiring and power are okay, attempt to communicate with the RSE module using a scan tool; if no response, replace the RSE module
Check for software updates for the RSE module or master module that may address communication issues
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, the vehicle is generally safe to drive. This code affects only the rear seat entertainment system and does not impact critical safety systems.
How much does it cost to fix?▼
Repair costs vary widely depending on the root cause. A simple fuse replacement may cost under $50, while replacing the RSE module can range from $200 to $800 including parts and labor.