B1390 GMC Code - Control Module Supply Circuit 1
Quick Answer
The B1390 GMC code refers to an issue with the Control Module Supply Circuit 1 in the vehicle. Common causes include Wiring issues, such as a short circuit or open circuit, Faulty control module, Blown fuse related to the control module supply circuit. 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 GMC indicates Control Module Supply Circuit 1.
- Common causes
- Common causes include Wiring issues, such as a short circuit or open circuit, Faulty control module, Blown fuse related to the control module supply circuit.
- 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 GMC Description
The B1390 GMC code refers to an issue with the Control Module Supply Circuit 1 in the vehicle. The control module is responsible for managing various systems in the vehicle, such as the engine, transmission, and emissions control. The control module supply circuit provides power to the control module, allowing it to function properly. When this circuit has a problem, it can lead to issues with the control module's operation, potentially affecting the performance of the vehicle.
Common Causes of B1390 GMC
- Wiring issues, such as a short circuit or open circuit.
- Faulty control module.
- Blown fuse related to the control module supply circuit.
- Battery or alternator problems affecting power supply.
- Corrosion or damage to connectors in the circuit.
Symptoms of B1390 GMC
- Check engine light illuminated on the dashboard.
- Engine running rough or stalling.
- Transmission shifting erratically.
- Loss of power or acceleration.
- Vehicle failing to start.
How to Fix B1390 GMC
- Begin by conducting a visual inspection of the wiring and connectors related to the control module supply circuit.
- Test the control module and related components for proper functioning.
- Check and replace any blown fuses in the circuit.
- Verify the battery and alternator are supplying the correct voltage to the control module.
- Clear the diagnostic trouble codes, reset the system, and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix B1390 GMC
The typical repair costs for addressing a B1390 GMC code can vary depending on the specific cause of the issue and the parts and labor required for the repair. In general, repairing a control module supply circuit issue may range from $200 to $500, including parts and labor. However, it's important to note that diagnostic time and labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. Rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more competitive pricing. For a more precise estimate, it's recommended to consult with a local auto repair shop.
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Information for Specific GMC Models
- B1390 2014 GMC Sierra — Control Module Supply Circuit 1
- B1390 2015 GMC Sierra — Control Module Supply Circuit 1
- B1390 2016 GMC Sierra — Control Module Supply Circuit 1
- B1390 2017 GMC Sierra — Control Module Supply Circuit 1
- B1390 2018 GMC Sierra — Control Module Supply Circuit 1
Frequently Asked Questions about B1390 GMC Code
1. What are the common symptoms of OBDII code B1390 GMC?
The common symptoms of OBDII code B1390 GMC include issues with starting the vehicle, poor engine performance, and potential stalling.
2. What are the possible causes of OBDII code B1390 GMC?
Possible causes of OBDII code B1390 GMC include a faulty control module, damaged wiring or connectors in the supply circuit, or a weak or dead battery.
3. How can I diagnose OBDII code B1390 GMC?
Diagnosing OBDII code B1390 GMC involves using a scan tool to read the code, checking the voltage supply to the control module, inspecting wiring and connectors for damage, and testing the battery's condition.
4. Can a weak battery cause OBDII code B1390 GMC?
Yes, a weak or dead battery can cause OBDII code B1390 GMC as it may not provide sufficient power to the control module.
5. How can I repair OBDII code B1390 GMC?
To repair OBDII code B1390 GMC, you may need to replace the faulty control module, repair or replace damaged wiring or connectors, and ensure the battery is in good condition.
6. Is it safe to continue driving with OBDII code B1390 GMC?
It is not recommended to continue driving with OBDII code B1390 GMC as it can lead to further damage to the vehicle and potential safety hazards.
7. Can OBDII code B1390 GMC be intermittent?
Yes, OBDII code B1390 GMC can be intermittent, especially if the issue is related to loose connections or sporadic electrical faults.
8. How much does it cost to repair OBDII code B1390 GMC?
The cost to repair OBDII code B1390 GMC can vary depending on the specific cause of the issue, but it may involve parts and labor expenses.
9. Can I reset OBDII code B1390 GMC with a simple battery disconnect?
While disconnecting the battery may clear the code temporarily, it is not a reliable long-term solution to address the underlying issue causing OBDII code B1390 GMC.
10. Do I need a professional mechanic to fix OBDII code B1390 GMC?
It is recommended to consult a professional mechanic to properly diagnose and repair OBDII code B1390 GMC to ensure the issue is resolved correctly and efficiently.
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