B1390 2015 GMC Sierra Code - Control Module Supply Circuit 1
Quick Answer
The B1390 diagnostic trouble code for a 2015 GMC Sierra relates to the Control Module Supply Circuit 1. Common causes include Damaged wiring or connectors, Faulty control module, Blown fuse. 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 2015 GMC Sierra indicates Control Module Supply Circuit 1.
- Common causes
- Common causes include Damaged wiring or connectors, Faulty control module, Blown fuse.
- 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 2015 GMC Sierra Description
The B1390 diagnostic trouble code for a 2015 GMC Sierra relates to the Control Module Supply Circuit 1. This code indicates that there is a problem with the power supply to a specific control module in the vehicle. In modern vehicles, control modules are responsible for managing various functions such as engine performance, transmission shifting, airbag deployment, and more. Control modules rely on a stable power supply to function correctly, and any disruption in this supply can lead to performance issues or malfunctions in the affected systems.
Common Causes of B1390 2015 GMC Sierra
- Damaged wiring or connectors
- Faulty control module
- Blown fuse
- Malfunctioning power supply relay
- Corrosion in electrical connections
Symptoms of B1390 2015 GMC Sierra
- Engine misfires or rough idling
- Transmission shifting irregularities
- Dashboard warning lights illuminated
- Reduced engine power or acceleration
- Control module failure
How to Fix B1390 2015 GMC Sierra
- Perform a thorough inspection of the wiring and connectors associated with Control Module Supply Circuit 1.
- Check the fuse related to the control module power supply and replace if necessary.
- Test the power supply relay for proper function and replace if found to be faulty.
- If the control module itself is determined to be the issue, replace it with a new unit.
- Clear the diagnostic trouble codes and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix B1390 2015 GMC Sierra
The cost of repairing the Control Module Supply Circuit 1 issue can vary depending on the specific cause of the problem and the cost of parts and labor in your area. On average, you can expect to pay anywhere from $200 to $500 for parts and labor. Keep in mind that diagnostic time and labor rates can impact the final cost, so it's advisable to get a detailed quote from a trusted auto repair shop before proceeding with the repair.
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Frequently Asked Questions about B1390 2015 GMC Sierra Code
What does OBDII code B1390 mean for a 2015 GMC Sierra?
OBDII code B1390 indicates a problem with the Control Module Supply Circuit 1, which affects the operation of various electrical components in the vehicle, often related to the body control module.
What are the common symptoms associated with code B1390?
Symptoms may include malfunctioning interior lights, faulty power windows, issues with the vehicle’s central locking system, or trouble with other electronic features.
What could cause the B1390 code to trigger?
Common causes include a short circuit in the wiring harness, a faulty body control module, poor ground connections, or issues with the power supply to the module.
How can I diagnose the B1390 code?
Start by using an OBD-II scanner to confirm the code. Then, inspect the wiring and connectors for any signs of damage, corrosion, or loose connections. Check the body control module and related circuits for proper voltage.
Are there any specific tools needed to troubleshoot code B1390?
Yes, you'll need an OBD-II scanner to read the codes, a multimeter to test voltage and continuity in circuits, and possibly a wiring diagram for the vehicle to trace connections.
What are the potential repair solutions for B1390?
Repairs may include repairing or replacing damaged wiring or connectors, replacing the body control module, or ensuring proper grounding and power supply to the control module.
Can I drive my 2015 GMC Sierra with the B1390 code?
While it may be possible to drive with this code, it could lead to further electrical problems or malfunctions of important features, so it’s advisable to address the issue as soon as possible.
How do I clear the B1390 code after repairs?
After completing the necessary repairs, you can clear the code using an OBD-II scanner. If the issue is resolved, the code should not reappear after a short test drive.
Will ignoring the B1390 code cause further damage to my vehicle?
Yes, ignoring the code can lead to further electrical complications, potentially affecting related systems and leading to more extensive repairs down the line. It's best to address the issue promptly.
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