U0191 GMC Code - Lost Communication With Television
Quick Answer
Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Television, Television harness is open or shorted, Television circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- U0191 GMC indicates Lost Communication With Television.
- Common causes
- Common causes include Faulty Television, Television harness is open or shorted, Television circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code U0191 GMC Description
What are the Possible Causes of the DTC U0191 GMC?
- Faulty Television
- Television harness is open or shorted
- Television circuit poor electrical connection
How to Fix the DTC U0191 GMC?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the U0191 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about U0191 GMC Code
1. What does the OBDII code U0191 mean on a GMC?
The U0191 code indicates a loss of communication with the Telematics Control Module (TCM), often referred to as the "Television" in certain vehicle diagnostics.
2. What are common symptoms of the U0191 code on a GMC?
Symptoms can include a non-functional OnStar system, inoperative navigation or infotainment features, and warning lights on the dashboard.
3. What causes the U0191 code to appear on a GMC?
The code is typically caused by faulty wiring, a damaged Telematics Control Module, a blown fuse, or a network communication error within the vehicle.
4. Can a weak battery cause the U0191 code on a GMC?
Yes, a weak or failing battery can disrupt communication between modules and trigger the U0191 code.
5. How can I diagnose the U0191 code on a GMC?
Start by checking the wiring and connectors for damage, inspecting the fuses, and using a scan tool to monitor communication between modules.
6. Is it safe to drive with the U0191 code on a GMC?
In most cases, the vehicle is still drivable, but key features like emergency communication or navigation may not work properly.
7. How do I fix the U0191 code on a GMC?
Repairs may involve replacing damaged wiring, reconnecting loose connectors, replacing the Telematics Control Module, or updating module software.
8. Can a software update fix the U0191 code on a GMC?
Yes, in some cases, a software update for the affected module can resolve communication issues.
9. How much does it cost to repair the U0191 code on a GMC?
Repair costs can range from $100 for simple wiring repairs to $1,000 or more if the Telematics Control Module needs replacement.
10. Can I clear the U0191 code on a GMC without fixing the issue?
You can clear the code with a scan tool, but it will likely return if the underlying problem is not resolved.
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