AutoCodes – Saturn – B1372 Saturn

B1372 Saturn 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 Saturn 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 989

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

What does this mean?

What are the Possible Causes of the DTC B1372 Saturn?

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 Saturn?

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 Saturn 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 Saturn Code

1. What are the common symptoms of OBDII code B1372 on a Saturn related to the Device Ignition On and Start Circuit Low?

The common symptoms include difficulty starting the vehicle, intermittent stalling, and the check engine light illuminating.

2. What are the possible causes of OBDII code B1372 on a Saturn?

Possible causes include a faulty ignition switch, damaged wiring in the ignition system, a malfunctioning starter relay, or a problem with the vehicle's computer system.

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

Diagnosing this code typically involves using a diagnostic scanner to retrieve the trouble codes, checking the ignition system components for any visible damage, and testing the starter relay for proper functionality.

4. What are some repair tips for fixing OBDII code B1372 on a Saturn?

Some repair tips include inspecting and repairing any damaged wiring in the ignition system, replacing a faulty ignition switch, testing and replacing the starter relay if necessary, and resetting the code with a diagnostic scanner after repairs are completed.

5. Can I drive my Saturn with the OBDII code B1372 present?

It is not recommended to drive your Saturn with this code present, as it can lead to potential starting issues and stalling while driving, which can compromise safety.

6. How serious is the OBDII code B1372 on a Saturn?

While the code itself may not pose an immediate danger, it can cause starting and driving issues that may impact the vehicle's performance and reliability.

7. Can I reset the OBDII code B1372 on my Saturn without fixing the underlying issue?

Resetting the code without addressing the underlying problem may temporarily turn off the check engine light, but the issue will likely reoccur if the root cause is not fixed.

8. Is it necessary to take my Saturn to a mechanic for OBDII code B1372 repairs?

While some DIY enthusiasts may be able to diagnose and repair this code themselves, it is recommended to consult a qualified mechanic for proper diagnosis and repair to ensure the issue is resolved correctly.

9. How much does it typically cost to fix OBDII code B1372 on a Saturn?

The cost of repairs can vary depending on the specific cause of the code and the labor rates in your area, but it may range from $100 to $300 or more, including parts and labor.

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

Regular maintenance, such as checking and replacing worn ignition system components, ensuring proper wiring connections, and timely repairs of any related issues, can help prevent the recurrence of this code in the future.