AutoCodes – Cadillac – B1370 Cadillac

B1370 Cadillac 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 Cadillac 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 6,557

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

What does this mean?

What are the Possible Causes of the DTC B1370 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac Code

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

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

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

- Potential causes include a faulty ignition switch, issues with the starter relay, damaged wiring in the ignition circuit, or a malfunctioning control module.

3. How can I diagnose the OBDII code B1370 in my Cadillac?

- Diagnosing this code typically involves using a diagnostic scanner to retrieve the code, checking the wiring and connections in the ignition circuit, and testing the components related to the ignition system.

4. Can I still drive my Cadillac with OBDII code B1370 present?

- It is not recommended to drive the vehicle with this code present, as it can lead to potential starting or stalling issues, which may compromise safety and reliability.

5. How can I repair OBDII code B1370 in my Cadillac?

- Repairing this code may involve replacing the faulty ignition switch, repairing damaged wiring, replacing the starter relay if needed, or addressing any issues with the control module.

6. Is it necessary to reset the OBDII code B1370 after performing repairs?

- Yes, it is recommended to clear the code using a diagnostic scanner after repairs have been made to ensure that the issue has been resolved and to reset the vehicle's system.

7. Are there any preventive measures to avoid OBDII code B1370 in a Cadillac?

- Regular maintenance, such as checking the condition of the ignition system components and addressing any issues promptly, can help prevent the occurrence of this code.

8. Can extreme weather conditions affect OBDII code B1370 in a Cadillac?

- Yes, extreme weather conditions can potentially impact the performance of the ignition system components and lead to the triggering of this code.

9. Is it safe to attempt DIY repairs for OBDII code B1370 in a Cadillac?

- While some simple repairs like checking wiring connections can be done DIY, it is recommended to seek professional help for more complex issues related to the control module or ignition system.

10. How long does it typically take to repair OBDII code B1370 in a Cadillac?

- The repair time can vary depending on the specific cause of the code and the extent of the repairs needed, ranging from a few hours to a full day in some cases.