B0140

The B0140 diagnostic trouble code indicates that the body control module has identified a power liftgate position sensor malfunction issue. This code means a body sensor or its circuit is not providing expected readings. Accurate sensor data is important for proper operation of safety and convenience systems throughout the vehicle. This guide covers everything you need to know about this topic, including common causes, step-by-step solutions, and answers to frequently asked questions.

Here are the key things to understand: Auto-dimming mirror not responding to light changes. Window pinch protection not functioning. Parking sensors not detecting obstacles. Door ajar warning when doors are closed. Understanding these fundamentals will help you diagnose and resolve this issue more effectively.

The most common reasons this occurs include: Sensor contamination or physical damage. Faulty impact or occupancy sensor. Sensor out of calibration. Camera lens obstructed or damaged. Identifying the root cause is the first step toward finding the right solution.

To resolve this, follow these recommended steps: Connect an OBD-II scanner and read all stored body control module trouble codes. Inspect the affected sensor and its wiring connector for damage or corrosion. Test the sensor resistance or voltage output with a multimeter. Check for physical obstructions, contamination, or misalignment of the sensor. Verify sensor calibration using scan tool where applicable. If these steps do not resolve the issue, consider consulting additional resources or a qualified professional.

This article is part of our Body (B) collection on OBD Codes. We provide comprehensive, up-to-date information to help you find solutions quickly.