AutoCodes – Saturn – B1440 Saturn

B1440 Saturn 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 Saturn 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 1,374

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

What does this mean?

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

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

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

2. What causes the OBDII code B1440 in a Saturn related to Power Mode Master Input Circuits Mismatch?

- This code is typically triggered by a communication error between the power mode master and input circuits, often due to wiring faults or module malfunctions.

3. How can I diagnose the OBDII code B1440 in a Saturn related to Power Mode Master Input Circuits Mismatch?

- Diagnosing this code involves checking the wiring harness for any damage or loose connections, as well as testing the power mode master and input circuits for proper functionality.

4. Can a DIY enthusiast repair the OBDII code B1440 in a Saturn related to Power Mode Master Input Circuits Mismatch?

- While basic troubleshooting like checking connections and wiring can be done by DIY enthusiasts, resolving the root cause of the issue may require specialized tools and expertise, best left to professionals.

5. Is it safe to continue driving with the OBDII code B1440 in a Saturn related to Power Mode Master Input Circuits Mismatch?

- It is not recommended to drive the vehicle with this code present, as it can lead to potential safety hazards and further damage if left unresolved.

6. How much does it typically cost to repair the OBDII code B1440 in a Saturn related to Power Mode Master Input Circuits Mismatch?

- Repair costs can vary depending on the exact cause of the issue, but it is advisable to budget for diagnostic fees, parts replacement, and labor costs when seeking professional help.

7. Can resetting the OBDII system clear the B1440 code in a Saturn related to Power Mode Master Input Circuits Mismatch?

- Resetting the system may temporarily clear the code, but it is essential to address the underlying problem causing the code to prevent it from recurring.

8. Are there any preventive measures to avoid encountering the OBDII code B1440 in a Saturn related to Power Mode Master Input Circuits Mismatch?

- Regular vehicle maintenance, including inspecting wiring harnesses and electrical components, can help prevent issues that may lead to this code from occurring.

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

- The repair time can vary depending on the complexity of the issue and availability of parts, so it is best to consult with a professional technician for an accurate estimate.

10. Can a faulty battery or alternator cause the OBDII code B1440 in a Saturn related to Power Mode Master Input Circuits Mismatch?

- While a faulty battery or alternator can cause electrical issues in a vehicle, they are not typically direct causes of the Power Mode Master Input Circuits Mismatch code.