AutoCodes – Pontiac – B1372 Pontiac

B1372 Pontiac 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 Pontiac 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.

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Code Popularity 943

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Mar 17, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1372 Pontiac 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 Pontiac - Device Ignition On and Start Circuit Low - AutoCodes.com — B1372 Pontiac Code - Device Ignition On and Start Circuit Low

What does this mean?

What are the Possible Causes of the DTC B1372 Pontiac?

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 Pontiac?

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 Pontiac 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 B1372 Pontiac Code

1. What are the common symptoms of OBDII code B1372 Device Ignition On and Start Circuit Low in a Pontiac?

- Common symptoms include difficulty starting the vehicle, intermittent stalling, and the engine not turning over.

2. What are the possible causes of OBDII code B1372 in a Pontiac?

- Possible causes include a faulty ignition switch, damaged wiring in the ignition circuit, or a defective starter relay.

3. How can I diagnose the OBDII code B1372 in my Pontiac?

- The diagnosis involves checking the ignition switch for proper operation, inspecting the wiring for any damage or loose connections, and testing the starter relay.

4. Can a DIY enthusiast repair OBDII code B1372 in a Pontiac?

- While some repairs for this code may be within reach for DIY enthusiasts, it's recommended to consult a professional mechanic for a thorough diagnosis and repair.

5. Are there any tips for troubleshooting OBDII code B1372 in a Pontiac?

- It's essential to start by checking the battery voltage and ensuring all connections are secure before delving into diagnosing the specific components related to the code.

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

- It's not recommended to drive the vehicle with this code present, as it can lead to potential starting issues and possible stalling while driving.

7. How urgent is it to address OBDII code B1372 in a Pontiac?

- It's advisable to address this code promptly to avoid potential inconvenience of the vehicle not starting or stalling unexpectedly.

8. Can extreme weather conditions affect OBDII code B1372 in a Pontiac?

- Yes, extreme temperatures can sometimes exacerbate electrical issues related to the ignition system, potentially triggering the B1372 code.

9. What are the typical repair costs associated with fixing OBDII code B1372 in a Pontiac?

- Repair costs can vary depending on the exact cause of the code, but they may include parts replacement, wiring repairs, or labor costs for diagnosis and repair.

10. How can I prevent OBDII code B1372 from recurring in my Pontiac?

- Regular maintenance, such as checking the battery and electrical connections, can help prevent the reoccurrence of the B1372 code in your Pontiac.