Chevrolet Code P1381 – Misfire Detected – No Communication with Brake Control Module

Chevrolet P1381 Code: Description and Solutions

The diagnostic code P1381 for Chevrolet indicates the detection of an engine misfire accompanied by a lack of communication with the brake control module (BCM). This issue can affect the vehicle’s performance as well as its safety systems. A misfire means one or more cylinders are not functioning properly, which can lead to reduced power, rough idling, decreased fuel efficiency, and potential long-term damage to the catalytic converter.

Common Causes of Chevrolet P1381 Code

The main causes of this problem include:

• Faulty ignition components: spark plugs, coils, or ignition wires.
• Faulty brake control module (BCM).
• Wiring issues or poor connections between the affected systems.
• ECM (Engine Control Module) failure.
• Corroded or damaged connectors.

Symptoms Associated with Chevrolet P1381 Code

Signs indicating this problem may include:

• Engine misfires or irregular operation.
• Loss of power and reduced acceleration.
• Illumination of the check engine light (MIL).
• ABS or traction control warning lights on the dashboard.
• Braking issues, such as reduced effectiveness or unusual noises.

Steps to Resolve Chevrolet P1381 Code

To resolve this issue, proceed as follows:

1. Perform a comprehensive diagnostic scan to identify the exact cause of the misfire and communication loss.
2. Inspect ignition system components: check spark plugs, coils, and wiring, and replace any faulty parts.
3. Check the brake control module (BCM) and associated wiring for any damage or malfunction.
4. Repair or replace faulty components identified during the diagnostic analysis.
5. Clear diagnostic codes, reset the ECM, and test the vehicle to ensure the issue is resolved.

Additional Technical Information

• If the P1381 code is accompanied by other diagnostic codes, it is advisable to address those first before clearing the P1381 code.
• This code is set when the powertrain control module (PCM) does not receive the necessary rough road information, while the DTC P0300 requests activation of the malfunction indicator light (MIL).