B1390 2014 GMC Sierra Code - Control Module Supply Circuit 1
Quick Answer
The vehicle control modules or sensors monitor the system voltage to verify the system voltage is within the normal operating range. Common causes include Low battery voltage, Faulty Control Module, Control Module harness is open or shorted. 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
- B1390 2014 GMC Sierra indicates Control Module Supply Circuit 1.
- Common causes
- Common causes include Low battery voltage, Faulty Control Module, Control Module harness is open or shorted.
- 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 B1390 2014 GMC Sierra Description
What are the Possible Causes of the DTC B1390 2014 GMC Sierra?
- Low battery voltage
- Faulty Control Module
- Control Module harness is open or shorted
- Control Module circuit poor electrical connection
How to Fix the DTC B1390 2014 GMC Sierra?
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 B1390 2014 GMC Sierra 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 B1390 2014 GMC Sierra Code
1. What does the OBDII code B1390 mean on a 2014 GMC Sierra?
The code B1390 indicates an issue with "Control Module Supply Circuit 1," which typically refers to a problem with the power supply to a specific control module.
2. What are common symptoms of the B1390 code in a 2014 GMC Sierra?
Symptoms may include intermittent electrical issues, warning lights on the dashboard, or failure of certain systems like lighting, HVAC, or other electronics.
3. What causes the B1390 code to appear on a 2014 GMC Sierra?
Common causes include a blown fuse, a damaged wiring harness, a faulty control module, or poor electrical connections in the supply circuit.
4. Can a weak battery trigger the B1390 code on a 2014 GMC Sierra?
Yes, a weak or failing battery can cause voltage issues that may trigger this code.
5. How do you diagnose the B1390 code on a 2014 GMC Sierra?
Start by inspecting the fuses, wiring, and connectors in the affected circuit. Check for proper voltage supply to the control module and test the battery for sufficient charge.
6. Is it safe to drive with the B1390 code on a 2014 GMC Sierra?
It depends on the affected system, but driving with unresolved electrical issues can lead to further damage or unexpected system failures.
7. What repairs are typically needed for the B1390 code on a 2014 GMC Sierra?
Repairs may include replacing a blown fuse, repairing or replacing damaged wiring, fixing poor connections, or replacing the faulty control module.
8. How much does it cost to fix the B1390 code on a 2014 GMC Sierra?
Repair costs vary depending on the issue, but fixing a blown fuse is inexpensive, while replacing a control module can cost several hundred dollars or more.
9. Can clearing the B1390 code fix the problem on a 2014 GMC Sierra?
Clearing the code without addressing the underlying issue will not fix the problem, and the code is likely to return.
10. What tools are needed to troubleshoot the B1390 code on a 2014 GMC Sierra?
You’ll need a diagnostic scan tool, a multimeter to check voltage and continuity, and possibly wiring diagrams for the specific circuit.
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