Troubleshooting Dexcom G7 Sensor Failure: A Comprehensive Guide

Dexcom G7 Sensor Failure
Table of Contents:
  • Introduction
  • What is Dexcom G7 Sensor Failure?
  • Common Types of Sensor Failure Errors
  • Typical Signs of Dexcom G7 Sensor Failure
  • Potential Causes of Dexcom G7 Sensor Failure
  • Troubleshooting Dexcom G7 Sensor Failure
  • Exploring Alternative CGM Options
  • Conclusion


If you are a person with diabetes who relies on the advanced Dexcom G7 Continuous Glucose Monitoring (CGM) system to keep your blood sugar levels in check, you might face some challenges with the sensors that can impact their accuracy and reliability. Sensor failure can be frustrating, leaving you unsure about your glucose readings and potentially hindering your ability to make informed decisions about your insulin dosage. This article will delve into Dexcom G7 sensor failure, discussing common signspossible causes, and effective troubleshooting strategies to help you regain control over your diabetes management.

What is Dexcom G7 Sensor Failure?

Dexcom G7 sensor failure is when the continuous glucose monitoring system fails to offer precise and dependable readings, causing uncertainty about the user’s blood sugar levels. These inaccuracies can lead to incorrect insulin dosing decisions, which can significantly impact diabetes management and overall health.

Common Types of Sensor Failure Errors

Dexcom G7 False Low Reading: The Dexcom G7 sensor may display inaccurate low readings due to several factors, including compressed or broken sensors.

No Reading at All: It's possible for the Dexcom G7 not to display any readings at times. This can occur if the sensor is too far from the display device. Therefore, keeping the sensor close to the device is important to ensure accurate readings. Additionally, please be aware that checking readings while the device is submerged in water could result in the sensor failing and no readings displayed.

Connectivity Issues: It's common to experience connectivity problems using the Dexcom G7 sensor. Such issues are often caused by errors within the mobile app or due to poor Bluetooth signal strength. When the Bluetooth signal is weak, it may lead to data transmission errors, resulting in incorrect or no readings. Similarly, the mobile app may malfunction due to outdated software, bugs, or incompatibility issues with the user's device. Therefore, it's important to ensure that the Dexcom G7 app is always up-to-date and that the user's device is compatible before using the sensor.

Typical Signs of Dexcom G7 Sensor Failure

It is crucial to identify potential sensor failures early. Below are some common signs that may indicate Dexcom G7 sensor failure:

  1. Inconsistent Readings: Frequent fluctuations or sudden spikes/drops in glucose levels that do not align with physical symptoms or other blood sugar readings.
  2. No Signal or Communication Error: If you're seeing "No Signal" or "Communication Error" messages on your Dexcom G7 receiver or app, there's a signal or communication problem that must be fixed immediately. Don't let these errors persist and compromise your glucose monitoring. Action now to troubleshoot and resolve the issue to ensure your health and well-being are unaffected.
  3. Calibration Issues: Frequent calibration of the sensor may be necessary, but its accurate readings make it an essential tool to consider.
  4. Unreliable Trend Arrows: The trend arrows on your blood sugar monitoring device are designed to show you the direction of your blood sugar levels, whether they are increasing, decreasing, or staying stable. However, it's essential to remember that these trend arrows might not always align with how you're feeling. For instance, you might feel like your blood sugar is low, but the trend arrow points upwards, indicating that your blood sugar is increasing. On the other hand, you might feel like your blood sugar is high, but the trend arrow is pointing downward, indicating that your blood sugar is decreasing. Therefore, it's essential not solely to rely on the trend arrows but also to pay attention to your symptoms and feelings.
  5. Premature Sensor Failure: Premature Sensor Failure is expected when the sensor stops working before it reaches the recommended 10-day wear time. Various factors, such as poor quality control during manufacturing, improper handling during installation, or physical damage to the sensor, can cause this problem. It is essential to note that prompt action is necessary when this issue arises to ensure the accuracy of the readings and prevent any further complications. Therefore, it is highly recommended that the user contacts the manufacturer or supplier immediately to report the issue and request a replacement sensor.

Potential Causes of Dexcom G7 Sensor Failure

To effectively troubleshoot and address the issue of Dexcom G7 sensor failure, it is imperative to have a clear understanding of the possible reasons behind it. Several factors can contribute to sensor failure; identifying them should be a top priority.

Insertion Problems

It is important to be cautious while inserting the sensor, as improper insertion can result in inaccurate readings. The sensor’s accuracy depends on its secure placement and correct insertion angle. If the sensor is not securely placed or inserted at an incorrect angle, it may not function optimally. Therefore, it is recommended that the manufacturer carefully read the instructions before inserting the sensor to ensure that it is inserted correctly for accurate readings.

Sensor Aging

Over time, the accuracy of glucose sensors may decline due to wear and tear. This can lead to discrepancies in glucose readings, which can negatively impact the effectiveness of diabetes management. Therefore, it is important to replace the sensors regularly to maintain reliable and accurate results. The sensor replacement frequency may vary depending on the type and model of the sensor, as well as the individual’s needs and lifestyle. However, it is generally recommended that sensors be replaced every ten days. Regular sensor replacement ensures accurate readings and reduces the risk of skin irritation and infections caused by prolonged sensor use.

Calibration Issues

It’s important to note that inaccurate calibration or failure to calibrate the sensor can significantly impact the system’s performance. When prompted to calibrate, following the instructions precisely to ensure the sensor is calibrated correctly is crucial. This will help to optimize the system’s accuracy and reliability when taking measurements. If the sensor is calibrated correctly, the readings may be reliable, leading to correct conclusions or decisions based on the data. Therefore, it’s important to prioritize calibration and perform it regularly to maintain the system’s accuracy.

Compression and Pressure Issues

When wearing a glucose sensor, it’s essential to be mindful of compression and pressure issues. Too much pressure or compression is applied to the sensor site, especially during sleep or physical activities, which can interfere with the sensor’s ability to measure glucose levels accurately. This can result in inaccurate readings and potentially lead to incorrect insulin dosing, which can be dangerous for individuals with diabetes. Therefore, taking care when placing and securing the sensor is crucial to ensure it is not subjected to excessive pressure or compression.

Medication or Supplement Interference

Remember that the sensor’s accuracy is critical, and avoiding any substances that could potentially interfere with its performance is essential. Doing so lets you be confident that the sensor provides precise and reliable data.

Troubleshooting Dexcom G7 Sensor Failure

We must take assertive steps toward troubleshooting to address Dexcom G7 sensor failure effectively. Let’s explore some key troubleshooting techniques to tackle this issue.

Double-check Sensor Insertion

If you are experiencing problems with your sensor, it is essential to check if it has been inserted correctly. To do this:

  1. Refer to the guidelines provided by the manufacturer and follow them closely.
  2. Ensure the sensor is placed on a clean, dry skin site and adequately secured.
  3. Avoid applying the sensor on areas with a lot of movement, such as near joints, as this can cause it to come loose.

It is also important to ensure the sensor is placed at the correct angle, as this can affect its accuracy. By double-checking the sensor insertion and following these tips, you can ensure that you get the most accurate readings from your device.

Monitor Sensor Age

To ensure accurate and reliable results, it is important to check the age of your sensor. Generally, the Dexcom sensor is recommended to be replaced after ten days of usage. Therefore, monitoring the usage duration and replacing the sensor after the recommended time period is essential. This will help you maintain the accuracy of your readings and avoid any discrepancies in the results.

Calibrate Correctly

Calibrating your Dexcom G7 sensor is essential to ensure it provides the most accurate readings. Although calibration is not mandatory, if you choose to calibrate the sensor, it’s necessary to follow the process accurately. To calibrate, you must use fingerstick tests to verify and adjust the readings when prompted. Using a lancet device, you should take a blood sample from your finger and insert the reading into the Dexcom G7 sensor’s receiver. It’s essential to perform this process carefully and accurately to ensure the sensor provides accurate glucose readings.

Avoid Compression

Avoid applying excessive pressure or compression on the sensor site when taking glucose readings. This can interfere with the accuracy of the readings and result in incorrect data. Using a gentle touch and avoiding tight clothing or accessories that could put pressure on the sensor is recommended. Additionally, be cautious when sleeping or participating in physical activities to prevent accidental compression of the sensor site. By taking these precautions, you can ensure reliable and accurate glucose readings.

Account for Medications and Supplements

If you are taking any medications or supplements, it’s important to note that they may impact your glucose levels. Discussing this matter with your healthcare provider to ensure you’re fully aware of any potential risks or complications is highly recommended. Additionally, consider undergoing additional testing to cross-verify your glucose readings and ensure your levels are stable and healthy. Your healthcare provider can help you determine the best action based on your needs and medical history.

Contact Dexcom Support

Suppose you have followed the troubleshooting steps to resolve sensor failure issues with your Dexcom device but are still experiencing problems. In that case, you should contact Dexcom’s customer support team for further assistance. The customer support team is equipped to provide personalized guidance and support and may even offer a replacement sensor if necessary. They have a wealth of knowledge and resources to help you get the most out of your device and ensure a positive user experience. Please do not hesitate to contact them if you need assistance or have any questions.

Exploring Alternative CGM Options

Reliable Platforms for CGM Devices

If you have been frequently experiencing issues with the Dexcom G7 sensor failing, consider looking into other continuous glucose monitoring systems options. One highly recommended platform that you can explore is We offer a vast selection of CGM devices from well-known brands at competitive prices. You can monitor your blood sugar levels with greater accuracy and peace of mind by choosing a more reliable CGM device that suits your needs and preferences. So, to ensure that you get the best CGM device for your needs, check out the available options on

FreeStyle Libre 3: A Promising Alternative

If you’re looking for a reliable and accurate continuous glucose monitoring (CGM) device, Abbott’s FreeStyle Libre 3 sensor is worth considering. This innovative device boasts several outstanding features that set it apart from other CGM options. For starters, it has a high level of accuracy, which can reduce the likelihood of sensor failure issues and ensure that you have access to precise glucose data at all times. Additionally, the FreeStyle Libre 3 sensor is designed to be discreet and easy to wear, making it a convenient choice for people with busy lifestyles. 

You want to learn more about the FreeStyle Libre 3 sensor or other CGM devices, you can visit the Freestyle Libre 3 Buy Online. Here, you’ll find its unique features and benefits. With the help of Freestyle Libre 3, you can easily manage your blood glucose effectively. 


Managing diabetes can be a challenging experience, mainly when relying on continuous glucose monitoring (CGM) technology like the Dexcom G7 sensor. Despite its usefulness in providing accurate glucose readings, a sensor failure can occur, leading to frustrating situations for individuals managing diabetes. However, you can take several proactive measures to ensure that your CGM readings remain accurate and reliable.

Firstly, it’s essential to understand the common signs and potential causes of sensor failure. These can include incorrect sensor placement, sensor dislodgement, low battery power, and signal interference with other electronic devices. By becoming familiar with these signs and causes, you can troubleshoot issues more efficiently and take corrective action.

Secondly, Dexcom provides helpful troubleshooting steps in their support guide that can help you address various sensor failure issues. These steps include checking your sensor’s placement, ensuring it’s securely attached to your skin, checking your battery levels, and verifying that your transmitter communicates with your receiver or mobile device. Following these steps can help you resolve many sensor failure issues before they become more severe.

In addition, seeking support from Dexcom’s customer service can be valuable if you encounter complex issues that require expert assistance. Furthermore, considering alternative CGM options, such as those offered by reliable platforms like Online Dietary Supplements, can be wise to ensure a smoother diabetes management experience.

In conclusion, proactive management and a willingness to explore different solutions are crucial to success in diabetes care. With the right approach and resources, you can overcome sensor failure challenges and continue effectively monitoring your blood sugar levels for optimal health and well-being.

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Frequently Asked Questions

What are some common signs of Dexcom G7 sensor failure?

Some typical signs include inconsistent readings, no signal/communication errors, frequent calibration issues, unreliable trend arrows, and premature sensor failure before the 10-day wear time.

What could be causing my Dexcom G7 sensor to fail?

Potential causes include improper sensor insertion, sensor aging, calibration issues, compression/pressure on the sensor site, interference from medications or supplements, and other factors.

How can I troubleshoot Dexcom G7 sensor failure?

You can double-check the sensor insertion, monitor sensor age and replace on time, calibrate correctly if needed, avoid compressing the sensor site, account for any medications/supplements that may interfere, and contact Dexcom support.

Are there alternative CGM options if I continue having issues with Dexcom G7?

Yes, you can explore other brands and models like the FreeStyle Libre 3 from reliable platforms like that offer competitive prices and selection.

Why should I consider the FreeStyle Libre 3 as an alternative to Dexcom G7?

The FreeStyle Libre 3 is highlighted as a promising option due to its high accuracy to reduce sensor failures, discreet and easy to wear design, and ability to effectively manage blood glucose.

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