B1440 Trouble Code in Chevrolet Vehicles: Symptoms and Solutions

B1440 Trouble Code in Chevrolet Vehicles: Symptoms and Solutions

If you’re a vehicle owner or car enthusiast, encountering a diagnostic trouble code (DTC) can be daunting. One such code that might pop up in your Chevrolet is the B1440 trouble code. This code is related to the Body Control Module (BCM) and indicates a “Power Mode Master Input Circuit Mismatch.” In simpler terms, it means there’s a discrepancy in the ignition switch circuit, which can affect various vehicle functions.

What is the Chevrolet B1440 Code?

The B1440 code is triggered when the BCM detects an inconsistency in the ignition switch positions. This could be due to issues with the ignition switch itself, wiring problems, or faults within the BCM. The BCM is responsible for managing various electronic functions in your vehicle, including the ignition system, and any issues here can lead to broader problems.

Top 20 Vehicles Commonly Affected by the B1440 Code

Based on various sources and user reports, the following Chevrolet vehicles are commonly affected by the B1440 code:

  • Chevrolet Silverado
  • Chevrolet Tahoe
  • Chevrolet Suburban
  • Chevrolet Express
  • Chevrolet TrailBlazer
  • Chevrolet Colorado
  • Chevrolet Avalanche
  • Chevrolet Impala
  • Chevrolet Malibu
  • Chevrolet Equinox
  • Chevrolet Traverse
  • Chevrolet Camaro
  • Chevrolet Corvette
  • Chevrolet Sonic
  • Chevrolet Cruze
  • Chevrolet Volt
  • Chevrolet HHR
  • Chevrolet Blazer
  • Chevrolet Captiva
  • Chevrolet Uplander

Implications on Vehicle Performance and Emissions

The B1440 code can have several implications on your vehicle’s performance and emissions:

  • Starting Issues: The vehicle may have trouble starting or may not start at all.
  • Accessory Functions: Problems with the ignition switch can affect accessory functions like the radio, power windows, and other electronic systems.
  • Emissions: While the B1440 code itself may not directly affect emissions, any issues with the ignition system can lead to incomplete combustion, potentially increasing emissions.
  • Safety Concerns: Faulty ignition systems can pose safety risks, such as the vehicle shutting off unexpectedly.

Diagnosing and Fixing the B1440 Code


  • Difficulty starting the vehicle
  • Accessories not working properly
  • Warning lights on the dashboard
  • Inconsistent ignition switch behavior

Diagnostic Steps

  1. Check for Other Codes: Use an OBD-II scanner to check for other related codes that might provide additional context.
  2. Inspect the Ignition Switch: Look for any visible damage or wear in the ignition switch.
  3. Test the Wiring: Check the wiring connected to the ignition switch for any signs of damage, corrosion, or loose connections.
  4. Examine the BCM: Ensure the BCM is functioning correctly and there are no faults within the module.

Fixing the Issue

  • Replace the Ignition Switch: If the ignition switch is faulty, it should be replaced.
  • Repair Wiring: Fix any damaged or corroded wiring connected to the ignition switch.
  • Replace the BCM: If the BCM is faulty, it may need to be replaced. Ensure it is properly programmed to your vehicle.


Is it safe to drive with the B1440 code?
Driving with the B1440 code is not recommended as it can lead to starting issues and affect other electronic systems in your vehicle. It’s best to address the issue promptly.

What are the potential repair costs?
Repair costs can vary depending on the specific issue. Replacing an ignition switch can cost between $150 and $300, while BCM replacement can range from $300 to $600, including labor.

How can I prevent this issue?
Regular maintenance and inspections can help prevent issues with the ignition switch and BCM. Ensure that wiring is in good condition and address any electrical issues promptly.


Addressing the B1440 trouble code promptly is crucial for maintaining your vehicle’s efficiency and compliance with emission standards. Ignoring this code can lead to more significant issues down the road, affecting both performance and safety. If you encounter this code, follow the diagnostic steps and consider seeking professional help to ensure your vehicle remains in top condition.

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.