OBD2 Code U1194: Mirror Module Communication Fault
The U1194 code is a manufacturer-specific network communication code indicating a failure in the Standard Corporate Protocol (SCP) based on SAE J1850. It is triggered when the powertrain control module (PCM) or communication module receives invalid or no data from the mirror control module. This fault typically does not affect engine performance or driving safety, but it indicates a disruption in the vehicle's convenience and comfort systems.
1. Commonly Affected Makes
2. Most Common Causes
- Faulty mirror control module
- Short circuit or open circuit in the SCP (J1850) bus wiring
- Corroded or bent pins in the mirror module connector
- Poor ground connection at the mirror module
- Faulty mirror control switch
- Configuration or programming issue in the communication module
3. Symptoms You Will Notice
- Malfunctioning or unresponsive power mirrors
- Illuminated check engine light or service soon light
4. Step-by-Step Diagnosis
Scan for other related codes and check freeze frame data
Inspect the mirror module connector for corrosion, bent pins, or poor contact
Test the SCP bus wiring for shorts, opens, or high resistance
Verify the mirror module ground connection is clean and tight
Check the mirror control switch operation and wiring
If all else fails, attempt to reprogram or replace the mirror control module
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is generally safe to drive as the code does not affect engine performance or braking. However, power mirrors may not work properly.
How much does it cost to fix?▼
Diagnosis typically costs $75-$150. Repair costs vary: a new mirror module can be $100-$300, plus labor; wiring repairs may be $50-$200.