U0249 GMC Code - Lost Communication With Rear Entertainment Control Module
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 Rear Entertainment Control Module, Rear Entertainment Control Module harness is open or shorted, Rear Entertainment Control Module 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
- U0249 GMC indicates Lost Communication With Rear Entertainment Control Module.
- Common causes
- Common causes include Faulty Rear Entertainment Control Module, Rear Entertainment Control Module harness is open or shorted, Rear Entertainment Control Module 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 U0249 GMC Description
What are the Possible Causes of the DTC U0249 GMC?
- Faulty Rear Entertainment Control Module
- Rear Entertainment Control Module harness is open or shorted
- Rear Entertainment Control Module circuit poor electrical connection
How to Fix the DTC U0249 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 U0249 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 U0249 GMC Code
1. What does the OBDII code U0249 mean on a GMC?
U0249 indicates a loss of communication with the Rear Entertainment Control Module (RECM) on the vehicle's communication network.
2. What are the common symptoms of code U0249 in a GMC?
Symptoms may include the rear entertainment system not functioning, no audio or video output, or intermittent connection issues.
3. What causes the U0249 code to appear in a GMC?
Common causes include a faulty Rear Entertainment Control Module, damaged wiring or connectors, or issues with the vehicle's CAN (Controller Area Network) bus system.
4. Can a dead battery cause the U0249 code on a GMC?
Yes, a dead or weak battery can disrupt communication on the CAN network and trigger code U0249.
5. How do I diagnose the U0249 code on my GMC?
Start by checking the wiring and connectors to the RECM for damage or loose connections. Use a scan tool to test the communication signals on the CAN bus.
6. Can I still drive my GMC with a U0249 code?
Yes, the vehicle is generally drivable, but the rear entertainment system may not function properly, which could be inconvenient for passengers.
7. How do I fix the U0249 code on a GMC?
Repairs can involve reconnecting or replacing damaged wiring, updating the RECM software, or replacing the faulty module if necessary.
8. Does clearing the U0249 code resolve the issue?
Clearing the code may temporarily remove it, but if the underlying problem isn’t fixed, the code will likely return.
9. What tools are needed to troubleshoot the U0249 code?
A diagnostic scan tool capable of reading manufacturer-specific codes and testing CAN bus communication is essential.
10. Is the U0249 code specific to GMC vehicles?
No, U0249 is a generic OBDII code, but its specific symptoms and repair steps can vary depending on the make and model of the vehicle.
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