B1390 2017 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 2017 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 2017 GMC Sierra Description
What are the Possible Causes of the DTC B1390 2017 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 2017 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 2017 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 2017 GMC Sierra Code
1. What does the OBDII code B1390 mean on a 2017 GMC Sierra?
The code B1390 indicates an issue with the Control Module Supply Circuit 1, which typically relates to a voltage or power supply problem for a specific control module.
2. What are the common symptoms of the B1390 code in a 2017 GMC Sierra?
Common symptoms include warning lights on the dashboard, intermittent electrical issues, or certain systems not functioning, such as the radio, HVAC, or other module-controlled features.
3. What causes the B1390 code on a 2017 GMC Sierra?
Possible causes include a blown fuse, damaged wiring, corroded connectors, a faulty control module, or a weak battery.
4. How can I diagnose the B1390 code on my 2017 GMC Sierra?
Start by checking the fuses and battery voltage, inspect the wiring and connectors for damage or corrosion, and use a scan tool to test the affected control module.
5. Can a weak battery trigger the B1390 code on a 2017 GMC Sierra?
Yes, a weak or failing battery can cause insufficient voltage to the control module, triggering the B1390 code.
6. Is it safe to drive a 2017 GMC Sierra with the B1390 code?
It depends on the severity of the issue. While the vehicle may still operate, important systems could malfunction, so it’s best to address the issue promptly.
7. How do I fix the B1390 code on a 2017 GMC Sierra?
Repairs may include replacing a blown fuse, repairing or replacing damaged wiring, cleaning corroded connectors, or replacing the control module if it's defective.
8. Can a B1390 code clear itself on a 2017 GMC Sierra?
In rare cases, it might clear if the issue was intermittent, but the underlying problem should still be diagnosed and resolved to prevent recurrence.
9. How much does it cost to fix a B1390 code on a 2017 GMC Sierra?
Costs can vary widely depending on the cause. Simple repairs like replacing a fuse or cleaning connections are inexpensive, while control module replacement can be more costly.
10. Do I need a professional to fix the B1390 code on my 2017 GMC Sierra?
If you’re comfortable checking fuses, wiring, and connectors, you might resolve simple issues yourself. However, diagnosing and replacing a control module may require professional expertise.
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