B1370 GMC 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 GMC 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 GMC 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 GMC?
- 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 GMC?
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
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B1370 GMC 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.
Need more information about the B1370 GMC code?
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Need Help with the Code?
Get the B1370 GMC code diagnosed by a professional: Find a repair shop in your area
Information for Specific GMC Models
- B1370 2014 GMC Sierra — Control Module Ignition ON and Start Circuit
- B1370 2015 GMC Sierra — Control Module Ignition ON and Start Circuit
- B1370 2016 GMC Sierra — Control Module Ignition ON and Start Circuit
- B1370 2017 GMC Sierra — Control Module Ignition ON and Start Circuit
- B1370 2018 GMC Sierra — Control Module Ignition ON and Start Circuit
Frequently Asked Questions about B1370 GMC Code
1. What are the common symptoms of OBDII code B1370 GMC?
- The common symptoms include the engine not starting, the vehicle not responding when the key is turned, and issues with the ignition system.
2. What can cause the OBDII code B1370 GMC to trigger?
- The code is typically triggered when there is a fault in the control module ignition ON and start circuit, such as a wiring issue or a malfunctioning ignition switch.
3. How can I diagnose the cause of OBDII code B1370 GMC?
- Diagnosing the code involves checking the wiring connections, inspecting the ignition switch for faults, and testing the control module for proper function.
4. Can a faulty battery cause OBDII code B1370 GMC to appear?
- Yes, a weak or faulty battery can sometimes cause issues with the control module ignition ON and start circuit, leading to the code being triggered.
5. What repair tips can help resolve OBDII code B1370 GMC?
- Repair tips include checking and repairing any damaged wiring, replacing a faulty ignition switch, ensuring the battery is in good condition, and clearing the code with an OBDII scanner.
6. Is it safe to continue driving with OBDII code B1370 GMC present?
- It is not recommended to continue driving with the code present, as it can lead to starting issues and potential safety hazards. It is best to address the issue promptly.
7. Can a DIY enthusiast fix OBDII code B1370 GMC?
- Depending on the underlying cause, some DIY enthusiasts may be able to fix the issue by following repair guides and using the necessary tools. However, if in doubt, it's advisable to seek professional help.
8. How much does it typically cost to repair OBDII code B1370 GMC?
- The cost of repair can vary depending on the exact cause of the code and whether you choose to DIY or seek professional assistance. It's best to get a few quotes from mechanics in your area.
9. Will disconnecting the battery reset OBDII code B1370 GMC?
- Disconnecting the battery may reset the code temporarily, but if the underlying issue is not addressed, the code is likely to reappear. It's important to diagnose and fix the root cause.
10. Can extreme weather conditions contribute to OBDII code B1370 GMC triggering?
- Yes, extreme weather conditions can sometimes affect the electrical components involved in the control module ignition ON and start circuit, potentially leading to the code being triggered.
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