B1380 2015 GMC Sierra Code - Control Module Ignition Accessory Circuit
Quick Answer
The vehicle Power Mode Master (PMM) is the Body Control Module (BCM). Common causes include Faulty Ignition Switch, Ignition Switch harness is open or shorted, Ignition Switch circuit poor electrical connection. 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
- B1380 2015 GMC Sierra indicates Control Module Ignition Accessory Circuit.
- Common causes
- Common causes include Faulty Ignition Switch, Ignition Switch harness is open or shorted, Ignition Switch circuit poor electrical connection.
- 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 B1380 2015 GMC Sierra Description
The Power Mode Master will activate relays and other direct outputs of the Power Mode Master as needed according to the calculated power mode. Some relays controlled by the BCM are switched ignition voltage outputs that are pass-through circuits within the BCM directly from the ignition switch. If these circuits are short to ground, the B+ circuit fuse to the ignition switch will open.
What are the Possible Causes of the DTC B1380 2015 GMC Sierra?
- Faulty Ignition Switch
- Ignition Switch harness is open or shorted
- Ignition Switch circuit poor electrical connection
- Faulty Body Control Module (BCM)
How to Fix the DTC B1380 2015 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.
Code Tech Notes
B1380:04 Control Module Ignition Accessory Circuit Short to Ground or Open
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What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B1380 2015 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 B1380 2015 GMC Sierra Code
1. What does the OBDII code B1380 mean on a 2015 GMC Sierra?
The B1380 code indicates an issue with the Control Module Ignition Accessory Circuit, which manages power to certain electrical components when the ignition is in the accessory position.
2. What are the common symptoms of a B1380 code in a 2015 GMC Sierra?
Common symptoms include non-functional accessories like the radio or power windows, issues turning on accessory mode, or the battery draining unexpectedly.
3. What causes the B1380 code to appear?
This code is typically caused by a faulty ignition switch, damaged wiring or connectors in the ignition accessory circuit, or a malfunction in the control module.
4. Can a weak battery trigger the B1380 code?
Yes, a weak or failing battery can sometimes lead to insufficient power in the ignition accessory circuit, potentially triggering this code.
5. How can I diagnose the B1380 code on my GMC Sierra?
Start by checking the ignition switch, fuses, and wiring in the accessory circuit for damage or corrosion. Use a scan tool to monitor the circuit's voltage and confirm module communication.
6. Is the B1380 code serious, and can I drive with it?
While the vehicle may still be drivable, the code indicates issues with the accessory circuit that could lead to further electrical problems if not addressed promptly.
7. How do I fix the B1380 code on a 2015 GMC Sierra?
Repairs may include replacing the ignition switch, repairing or replacing damaged wiring, inspecting and replacing faulty fuses, or reprogramming the control module if necessary.
8. How much does it cost to repair a B1380 code on a GMC Sierra?
Repair costs can range from $100 to $500 depending on whether you need to replace the ignition switch, repair wiring, or reprogram the control module.
9. Can a DIYer fix the B1380 code on a GMC Sierra?
Yes, if you’re comfortable inspecting wiring, fuses, and the ignition switch, you can attempt the repair. However, module reprogramming or advanced diagnostics may require professional tools.
10. Will clearing the B1380 code with a scan tool fix the issue?
Clearing the code may temporarily remove it, but the underlying issue must be resolved to prevent the code from returning.
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