AutoCodes – Pontiac – B1440 Pontiac

B1440 Pontiac 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 Pontiac 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.

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Code Popularity 1,921

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

What does this mean?

What are the Possible Causes of the DTC B1440 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 B1440 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 B1440 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 B1440 Pontiac Code

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

- Common symptoms include issues with power door locks, power windows, and other power accessories not functioning correctly.

2. What are the possible causes of OBDII code B1440 in a Pontiac?

- The code B1440 typically indicates a problem with the power mode master input circuits, which could be caused by damaged wiring, a faulty power mode master switch, or a malfunctioning power mode master control module.

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

- To diagnose the issue, you can use an OBDII scanner to read the specific trouble codes, inspect the wiring harness for any damage, test the power mode master switch for proper functionality, and check the power mode master control module for faults.

4. Can I drive my Pontiac safely with the OBDII code B1440 present?

- It is not recommended to drive your Pontiac with the B1440 code present, as it may affect the proper operation of critical power accessories and could lead to further electrical issues.

5. How can I reset the OBDII code B1440 in my Pontiac?

- Resetting the B1440 code can be done using an OBDII scanner by clearing the code after addressing the underlying issue with the power mode master input circuits.

6. Is it possible to repair the Power Mode Master Input Circuits Mismatch issue in my Pontiac myself?

- While some DIY enthusiasts may be able to address the issue by checking and repairing wiring or components, it is recommended to consult a professional mechanic for a thorough diagnosis and repair.

7. Will the OBDII code B1440 in my Pontiac cause any damage to other vehicle systems?

- The B1440 code itself may not cause immediate damage, but if left unresolved, it could lead to further electrical issues and impact the overall functionality of power accessories in your Pontiac.

8. Are there any common tricks or tips to troubleshoot the Power Mode Master Input Circuits Mismatch issue?

- One common tip is to check all related fuses and relays first, as a blown fuse or faulty relay could be a simple fix for the B1440 code in a Pontiac.

9. How long does it typically take to repair the OBDII code B1440 related to Power Mode Master Input Circuits Mismatch?

- The repair time can vary depending on the exact cause of the issue, but it may take anywhere from a few hours to a full day to diagnose and fix the problem in a Pontiac.

10. Can extreme weather conditions affect the occurrence of the OBDII code B1440 in a Pontiac?

- Extreme weather conditions, such as heat or moisture, can sometimes exacerbate electrical issues leading to the B1440 code, so it's important to keep your vehicle protected and maintained properly.