AutoCodes – Chevrolet – B1372 Chevrolet

B1372 Chevrolet Code - Device Ignition On and Start Circuit Low

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: B1372 Chevrolet indicates Device Ignition On and Start Circuit Low.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 8,590

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 Mar 17, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B1372 Chevrolet Description

The vehicle Power Mode Master (PMM) is the Body Control Module (BCM). The ignition switch is a low current switch with multiple discrete ignition switch signals to the PMM for determination of the power mode. The PMM receives the ignition switch signals, and additionally a reference voltage signal from the BCM, through the ignition switch, and back to the BCM. There are redundancies within the PMM system that can allow operation of certain subsystems when there are faults in the ignition switch circuits. Other information such as serial data input from other modules and DTCs is also used to determine what power mode signals and information is transmitted by the PMM. The BCM logic uses all this information 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 PMM serial data message does not match what the individual module can detect from its own connections.
The PMM will activate relays and other direct outputs of the PMM 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 short to ground, the B+ circuit fuse to the ignition switch will open.

OBDII Code B1372 Chevrolet - Device Ignition On and Start Circuit Low - AutoCodes.com — B1372 Chevrolet Code - Device Ignition On and Start Circuit Low

What does this mean?

What are the Possible Causes of the DTC B1372 Chevrolet?

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 B1372 Chevrolet?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1372 Chevrolet 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 B1372 Chevrolet code?

Need more information on how to fix the B1372 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1372 Chevrolet code diagnosed by a professional: Find a repair shop in your area

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 B1372 Chevrolet Code

1. What are the common symptoms of OBDII code B1372 (Chevrolet) - Device Ignition On and Start Circuit Low?

- Common symptoms include difficulty starting the vehicle, intermittent starting issues, and potential engine stalling.

2. What are the typical causes of OBDII code B1372 (Chevrolet)?

- The code B1372 can be caused by issues such as faulty ignition switch, damaged wiring, poor electrical connections, or a malfunctioning starter motor.

3. How can I diagnose the OBDII code B1372 on my Chevrolet?

- Diagnosing the code B1372 involves using an OBDII scanner to retrieve the code, checking the ignition switch, inspecting wiring for damage, and testing electrical connections.

4. What are some repair tips for fixing OBDII code B1372 on my Chevrolet?

- Repair tips may include replacing the ignition switch, repairing or replacing damaged wiring, cleaning electrical connections, and ensuring proper functioning of the starter motor.

5. Can OBDII code B1372 (Chevrolet) cause any other problems in my vehicle?

- Yes, if left unresolved, code B1372 can lead to further electrical issues, potential engine starting failures, and in some cases, complete engine stalling.

6. Is it safe to continue driving my Chevrolet with OBDII code B1372 present?

- It is not recommended to drive the vehicle with code B1372 present, as it may result in unexpected starting problems or engine stalling, posing a safety risk.

7. How much does it typically cost to repair OBDII code B1372 on a Chevrolet?

- The cost of repairing code B1372 can vary depending on the exact cause and the labor rates of the repair shop, but it may range from $100 to $300 or more.

8. Can I reset the OBDII code B1372 on my Chevrolet by disconnecting the battery?

- While disconnecting the battery may reset the code temporarily, it is not a permanent solution. It is important to address the underlying issue causing the code to prevent it from recurring.

9. Are there any recalls or technical service bulletins related to OBDII code B1372 in Chevrolet vehicles?

- It is recommended to check with a Chevrolet dealership or consult online resources to see if there are any recalls or technical service bulletins related to code B1372 for your specific vehicle model.

10. How can I prevent OBDII code B1372 from appearing in my Chevrolet in the future?

- To prevent code B1372, it is important to maintain your vehicle's electrical system, regularly check the condition of the ignition switch and wiring, and address any starting issues promptly to avoid further complications.