AutoCodes – Buick – B1370 Buick

B1370 Buick 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 Buick 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.

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Code Popularity 6,280

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 17, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B1370 Buick Description

The vehicle Power Mode Master (PMM) is the Body Control Module (BCM). The ignition switch is a low-current switch with multiple discrete circuits to the BCM. The BCM logic uses the ignition switch positions to identify the operator's desired power mode and activate specific discrete signals, and serial data messages for the operation of different subsystems as necessary. Other modules which have switched voltage inputs may operate in a default mode if the Power Mode Master serial data message does not match what the individual module can detect from its own connections.
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.

OBDII Code B1370 Buick - Control Module Ignition ON and Start Circuit - AutoCodes.com — B1370 Buick Code - Control Module Ignition ON and Start Circuit

What does this mean?

What are the Possible Causes of the DTC B1370 Buick?

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 Buick?

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.

What does this mean?

Code Tech Notes

B1370:01 Control Module Ignition ON and Start Circuit Short to Battery
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 Buick 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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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1370 Buick Code

1. What are common symptoms of OBDII code B1370 in a Buick related to the Control Module Ignition ON and Start Circuit?

- Common symptoms include difficulty starting the vehicle, intermittent starting issues, and possible stalling during operation.

2. What are the possible causes of OBDII code B1370 in a Buick?

- The code B1370 can be triggered by a faulty ignition switch, wiring issues in the ignition circuit, or a malfunctioning control module.

3. How can I diagnose the cause of OBDII code B1370 in my Buick?

- To diagnose the issue, you can use a diagnostic scanner to read the code, check the wiring and connections in the ignition circuit, and test the ignition switch and control module for proper function.

4. Is it safe to continue driving my Buick with OBDII code B1370 present?

- It is not recommended to drive the vehicle with code B1370 present, as it can lead to potential starting and stalling problems, risking safety and further damage to the vehicle.

5. Can I repair OBDII code B1370 in my Buick myself?

- Depending on your automotive repair skills, you may be able to repair the issue yourself by addressing the faulty ignition switch, repairing wiring problems, or replacing the control module.

6. How much does it typically cost to repair OBDII code B1370 in a Buick at a dealership?

- The cost of repairing code B1370 at a dealership can vary, but it may include diagnostic fees, parts costs, and labor charges, potentially ranging from a few hundred to over a thousand dollars.

7. Are there any preventive measures to avoid OBDII code B1370 in my Buick?

- Regular maintenance, such as checking and maintaining the ignition system components, can help prevent issues that may trigger code B1370 in your Buick.

8. Can a weak battery or alternator cause OBDII code B1370 in a Buick?

- A weak battery or alternator can indirectly contribute to starting issues that may trigger code B1370, so it's recommended to ensure your electrical system is in good condition.

9. Will resetting the OBDII code B1370 in my Buick make the issue go away?

- Resetting the code may temporarily clear the warning light, but if the underlying issue causing code B1370 is not addressed, the problem is likely to reoccur.

10. How urgent is it to address OBDII code B1370 in my Buick?

- It is advisable to address code B1370 promptly to avoid potential starting and stalling issues that can affect the drivability and safety of your Buick.