B1390 2014 GMC Sierra Code - Control Module Supply Circuit 1
Quick Answer
The B1390 diagnostic trouble code (DTC) for a 2014 GMC Sierra relates to an issue with the control module supply circuit 1. Common causes include Faulty control module, Wiring or connector issues in the supply circuit, Blown fuse related to the control module. 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 Faulty control module, Wiring or connector issues in the supply circuit, Blown fuse related to the control module.
- 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.
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Code B1390 2014 GMC Sierra Description
The B1390 diagnostic trouble code (DTC) for a 2014 GMC Sierra relates to an issue with the control module supply circuit 1. This code indicates that there is a malfunction in the circuit responsible for supplying power to a specific control module within the vehicle's electronic system. The control module is a crucial component that manages various functions and systems in the vehicle, such as engine performance, transmission operation, and emissions control.
Common Causes of B1390 2014 GMC Sierra
- Faulty control module
- Wiring or connector issues in the supply circuit
- Blown fuse related to the control module
- Battery or alternator problems affecting power supply
- Water or corrosion damage to the circuit components
Symptoms of B1390 2014 GMC Sierra
- Check engine light illuminated on the dashboard
- Engine misfires or rough idling
- Loss of power or acceleration
- Transmission shifting issues
- Electrical system malfunctions
How to Fix B1390 2014 GMC Sierra
- Begin by conducting a thorough inspection of the control module, wiring, connectors, and fuses to identify any visible damage or issues.
- Use a multimeter to test the voltage and continuity in the supply circuit to pinpoint any electrical faults.
- Replace any damaged wiring, connectors, or fuses as needed to restore proper power supply to the control module.
- If the control module is found to be faulty, it may need to be replaced and reprogrammed to ensure compatibility with the vehicle's systems.
- Clear the DTC from the vehicle's computer using a diagnostic scanner after completing the repairs to reset the system and verify that the issue has been resolved.
Cost to Fix B1390 2014 GMC Sierra
The typical repair costs for addressing a B1390 code related to the control module supply circuit 1 in a 2014 GMC Sierra can vary depending on the specific cause of the issue and the extent of the repairs needed. On average, the parts and labor for this repair could range from $200 to $500. However, it's essential to note that diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's recommended to check with local shops for more accurate estimates.
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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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