AutoCodes – Chevrolet – B1440 Chevrolet

B1440 Chevrolet Code - Power Mode Master Input Circuits Mismatch

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: B1440 Chevrolet indicates Power Mode Master Input Circuits Mismatch.
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 7,528

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 B1440 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 B1440 Chevrolet - Power Mode Master Input Circuits Mismatch - AutoCodes.com — B1440 Chevrolet Code - Power Mode Master Input Circuits Mismatch

What does this mean?

What are the Possible Causes of the DTC B1440 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 B1440 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 B1440 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 B1440 Chevrolet code?

Need more information on how to fix the B1440 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1440 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 B1440 Chevrolet Code

1. What are the common symptoms of OBDII code B1440 in a Chevrolet related to Power Mode Master Input Circuits Mismatch?

- Common symptoms include issues with starting the vehicle, loss of power, and difficulty shifting gears.

2. What can cause the OBDII code B1440 to trigger in a Chevrolet?

- This code is typically triggered by a mismatch between the power mode master input circuits, often caused by a faulty power mode master switch or wiring issues.

3. How can I diagnose the Power Mode Master Input Circuits Mismatch issue in my Chevrolet?

- To diagnose this issue, it is recommended to perform a thorough inspection of the power mode master switch, check the wiring connections, and use an OBDII scanner to read the trouble codes.

4. Can I still drive my Chevrolet with the B1440 OBDII code present?

- It is not recommended to drive your Chevrolet with the B1440 code present, as it can lead to further damage and safety hazards. It is best to address the issue promptly.

5. Are there any quick fixes or temporary solutions for the B1440 code in a Chevrolet?

- Quick fixes or temporary solutions may include checking and resetting the power mode master switch, ensuring all connections are secure, and clearing the trouble codes with an OBDII scanner.

6. How much does it typically cost to repair the Power Mode Master Input Circuits Mismatch issue in a Chevrolet?

- The cost of repairing the B1440 code can vary depending on the exact cause of the issue and the labor rates in your area. It is recommended to consult a professional mechanic for an accurate estimate.

7. Can a DIY enthusiast fix the B1440 code on a Chevrolet, or is it better left to professionals?

- While some DIY enthusiasts may have the skills to address the Power Mode Master Input Circuits Mismatch issue, it is recommended to seek help from a professional mechanic to ensure proper diagnosis and repair.

8. Will resetting the OBDII code B1440 in my Chevrolet make the issue go away permanently?

- Simply resetting the code without addressing the underlying cause will not permanently fix the issue. It is crucial to diagnose and repair the root cause of the problem to prevent the code from reappearing.

9. Is the OBDII code B1440 specific to certain Chevrolet models or is it a common issue across different models?

- The B1440 code related to Power Mode Master Input Circuits Mismatch can occur in various Chevrolet models, especially those equipped with power mode master switches.

10. How long does it typically take to repair the B1440 code in a Chevrolet at a professional auto repair shop?

- The repair time for the B1440 code can vary depending on the exact cause of the issue, availability of parts, and the workload at the repair shop. It is advisable to inquire with the mechanic for an estimated time frame.