B1370 2014 GMC Sierra Code - Control Module Ignition ON and Start 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
- B1370 2014 GMC Sierra indicates Control Module Ignition ON and Start 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 B1370 2014 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 B1370 2014 GMC Sierra?
- Faulty Ignition Switch
- Ignition Switch harness is open or shorted
- Ignition Switch circuit poor electrical connection
- Faulty Body Control Module (BCM)
- Faulty Instrument Cluster (If code is stored in Instrument Cluster)
How to Fix the DTC B1370 2014 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
B1370:04 Control Module Ignition ON and Start Circuit Short to Ground or Open
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What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B1370 2014 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 B1370 2014 GMC Sierra Code
1. What does the OBDII code B1370 mean on a 2014 GMC Sierra?
The B1370 code indicates an issue with the Control Module Ignition ON and Start Circuit, typically related to a malfunction in the ignition circuit or wiring.
2. What are the common symptoms of the B1370 code in a 2014 GMC Sierra?
Symptoms can include the engine not starting, intermittent starting issues, or loss of power to certain electrical systems when the ignition is ON.
3. What causes the B1370 code to appear on a GMC Sierra?
Common causes include faulty ignition switch, damaged wiring or connectors in the ignition circuit, a failing control module, or poor electrical connections.
4. How do I diagnose the B1370 code on my 2014 GMC Sierra?
Start by inspecting the ignition switch, wiring, and connectors for damage or corrosion. Use a multimeter to check for proper voltage in the ignition circuit and scan the vehicle with an OBDII scanner to confirm the fault.
5. Can a bad ignition switch trigger the B1370 code?
Yes, a faulty ignition switch is a common cause of the B1370 code, as it may fail to properly send signals to the control module.
6. Is the B1370 code serious for my 2014 GMC Sierra?
Yes, it can prevent the vehicle from starting or operating correctly. It should be addressed promptly to avoid being stranded.
7. Can I fix the B1370 code myself on a GMC Sierra?
If you're comfortable with basic electrical diagnostics, you can check and repair damaged wiring or replace the ignition switch. For more complex issues, consult a professional mechanic.
8. How much does it cost to fix the B1370 code on a 2014 GMC Sierra?
Repair costs vary, but replacing an ignition switch typically costs $150–$300, while wiring repairs depend on the extent of damage.
9. Can a dead battery cause the B1370 code to appear?
A weak or dead battery can cause voltage-related issues, potentially triggering the code. Ensure your battery is fully charged and in good condition.
10. Will clearing the B1370 code with a scanner fix the issue?
Clearing the code will temporarily erase it, but if the underlying problem isn’t resolved, the code will return. Proper diagnosis and repair are necessary.
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