BMW P0668 Code:DME Internal Fault Interior Temperature Sensor Signal
As a BMW owner, it can be frustrating to see a diagnostic trouble code (DTC) appear on your dashboard. One such code is the P0668 code, which is related to an internal fault in the interior temperature sensor signal of the DME. If you’re experiencing this issue, it’s important to understand the meaning, causes, symptoms, and potential fixes for this code. In this article, we’ll dive into all of these aspects to help you get your BMW back on the road.
Understanding BMW P0668 Code
BMW P0668 code is a diagnostic trouble code (DTC) that indicates an internal fault in the interior temperature sensor signal of the engine control module (ECM). This means that the ECM is unable to receive accurate temperature readings from the interior temperature sensor, which can cause various issues with the vehicle’s performance and functionality. The code is specific to BMW vehicles and can be triggered by a range of factors, including faulty wiring, damaged sensors, or a malfunctioning ECM. If left unaddressed, the P0668 code can lead to further damage to the vehicle’s engine and other components, making it crucial to diagnose and fix the issue as soon as possible.
Signs and Symptoms of BMW P0668 Code
When the BMW P0668 code appears, it indicates an internal fault in the DME (Digital Motor Electronics) system’s interior temperature sensor signal. This fault can cause several symptoms that can affect the performance of your BMW. Here are some of the signs and symptoms of the BMW P0668 code:
- Check Engine Light: The most common symptom of the BMW P0668 code is the illumination of the check engine light on the dashboard. This light indicates that there is a problem with the engine or emissions system.
- Reduced Engine Power: Another symptom of the BMW P0668 code is reduced engine power. Your BMW may not accelerate as quickly as it used to, and you may notice a decrease in overall performance.
- Engine Stalling: In some cases, the BMW P0668 code can cause the engine to stall or shut off completely. This can be dangerous if it happens while driving, as it can cause a loss of control of the vehicle.
- Difficulty Starting: The BMW P0668 code can also cause difficulty starting the engine. You may need to try several times before the engine starts, or it may not start at all.
- Poor Fuel Economy: If the BMW P0668 code is not addressed, it can lead to poor fuel economy. Your BMW may use more fuel than usual, which can be costly in the long run.
If you notice any of these symptoms in your BMW, it is important to have it diagnosed and repaired as soon as possible. Ignoring the BMW P0668 code can lead to further damage to your vehicle and potentially more expensive repairs down the line. A qualified mechanic can diagnose the issue and provide the necessary repairs to get your BMW back on the road.
Possible Causes of BMW P0668 Code
The BMW P0668 code is related to an internal fault in the DME (Digital Motor Electronics) system, specifically the interior temperature sensor signal. This code indicates that there is an issue with the signal from the interior temperature sensor, which can cause various problems in the vehicle’s performance. Here are some of the possible causes of the BMW P0668 code:
- Faulty interior temperature sensor: The most common cause of the P0668 code is a faulty interior temperature sensor. This sensor is responsible for measuring the temperature inside the vehicle and sending the signal to the DME system. If the sensor is faulty, it can send incorrect signals, which can cause the P0668 code to appear.
- Wiring issues: Another possible cause of the P0668 code is wiring issues. If there is a problem with the wiring that connects the interior temperature sensor to the DME system, it can cause the signal to be disrupted or lost, resulting in the P0668 code.
- Failed DME system: In some cases, the P0668 code can be caused by a failed DME system. If the DME system is not functioning properly, it may not be able to receive or interpret the signal from the interior temperature sensor, resulting in the P0668 code.
- Software issues: Software issues can also cause the P0668 code to appear. If there is a problem with the software that controls the DME system, it may not be able to properly interpret the signal from the interior temperature sensor, resulting in the P0668 code.
- Other electrical issues: Other electrical issues, such as a blown fuse or a malfunctioning relay, can also cause the P0668 code to appear. These issues can disrupt the signal from the interior temperature sensor, resulting in the P0668 code.
In conclusion, the BMW P0668 code can be caused by various issues related to the interior temperature sensor signal. The most common causes include a faulty interior temperature sensor and wiring issues. However, it is important to have a professional mechanic diagnose and repair the issue to ensure that the correct cause is identified and fixed.
Fixes for BMW P0668 Code
The BMW P0668 code is related to an internal fault in the DME (Digital Motor Electronics) system’s interior temperature sensor signal. This fault can cause various issues with the vehicle’s performance, including reduced power, poor fuel efficiency, and even stalling. Here are some potential fixes for this code:
- Replace the interior temperature sensor: The most common fix for the P0668 code is to replace the interior temperature sensor. This sensor is responsible for measuring the temperature inside the vehicle and sending that information to the DME system. If the sensor is faulty, it can cause the DME to receive incorrect information and trigger the P0668 code.
- Check the wiring and connections: Another potential cause of the P0668 code is a wiring or connection issue. If the wiring or connections between the interior temperature sensor and the DME system are damaged or loose, it can cause the DME to receive incorrect information and trigger the code. Check the wiring and connections for any damage or looseness and repair as necessary.
- Replace the DME: In some cases, the P0668 code may be caused by a fault in the DME system itself. If this is the case, the only fix may be to replace the DME entirely. This is a more expensive fix, but it may be necessary if all other potential causes have been ruled out.
- Reset the DME system: Sometimes, the P0668 code may be triggered by a temporary glitch in the DME system. In these cases, resetting the DME system may be enough to clear the code and restore normal vehicle performance. This can be done using a diagnostic tool or by disconnecting the battery for a few minutes.
- Seek professional help: If you are unsure about the cause of the P0668 code or how to fix it, it is always best to seek professional help. A qualified mechanic or BMW specialist will be able to diagnose the issue and recommend the best course of action to get your BMW back on the road.
How Much Will It Take to Fix BMW P0668 Code?
Fixing the BMW P0668 code can be a bit tricky and may require some technical expertise. The cost of fixing the code may vary depending on the severity of the issue and the location of the repair shop. However, the average cost of fixing the P0668 code in a BMW vehicle can range from $200 to $500.
The cost may include the replacement of the interior temperature sensor or the repair of the wiring and connections related to the sensor. In some cases, the issue may be related to the DME (Digital Motor Electronics) module, which may require a replacement or reprogramming.
It is important to note that ignoring the P0668 code can lead to further damage to the vehicle’s engine and other components. Therefore, it is recommended to get the issue diagnosed and fixed as soon as possible to avoid any costly repairs in the future.
If you are experiencing the symptoms related to the P0668 code, such as poor fuel economy, rough idling, or engine misfires, it is best to take your BMW to a certified mechanic or dealership for a proper diagnosis and repair.
Possible Causes and Fixes of Code P0668 for BMW
| Possible Cause | Fix | Cost to Fix |
|---|---|---|
| DME Internal Fault Interior Temperature Sensor Signal | Replace the interior temperature sensor | $100-$300 |
| Wiring Issues | Check and repair any damaged wiring or connections | $50-$200 |
| Faulty DME | Replace the DME (Digital Motor Electronics) unit | $500-$1500 |
| Software Issues | Update or reprogram the DME software | $100-$300 |
Preventing BMW P0668 Code
If you own a BMW, you may have encountered the P0668 code, which indicates an internal fault in the interior temperature sensor signal of the DME. This code can cause various issues, including poor fuel economy, reduced engine performance, and even engine failure. However, there are several preventive measures you can take to avoid this code from appearing.
1. Regular Maintenance: One of the most effective ways to prevent the P0668 code is to ensure that your BMW undergoes regular maintenance. This includes oil changes, air filter replacements, and other routine checks. Regular maintenance can help identify and fix any issues before they become more significant problems.
2. Use High-Quality Parts: Using high-quality parts for your BMW can also help prevent the P0668 code. Cheap or low-quality parts can cause various issues, including sensor malfunctions, which can trigger the code. Therefore, it is essential to use genuine BMW parts or high-quality aftermarket parts that meet the manufacturer’s specifications.
3. Avoid Overheating: Overheating can cause various issues in your BMW, including sensor malfunctions. Therefore, it is crucial to avoid overheating your vehicle by ensuring that the cooling system is working correctly. Regularly check the coolant level and ensure that the radiator and other cooling system components are in good condition.
4. Check the Wiring: Faulty wiring can also cause the P0668 code. Therefore, it is essential to regularly check the wiring and connections of the interior temperature sensor. Ensure that the wiring is not damaged or corroded and that the connections are secure.
5. Avoid Rough Driving: Rough driving can cause various issues in your BMW, including sensor malfunctions. Therefore, it is crucial to avoid rough driving, such as sudden acceleration, hard braking, and aggressive cornering. These actions can cause the sensor to malfunction, triggering the P0668 code.
How Serious is the BMW P0668 Code?
The BMW P0668 code is a serious issue that needs to be addressed immediately. This diagnostic trouble code indicates an internal fault in the interior temperature sensor signal of the DME (Digital Motor Electronics) system. The interior temperature sensor is responsible for measuring the temperature inside the vehicle and sending the data to the DME system. If the sensor signal is faulty, it can cause a range of problems that can affect the performance and safety of the vehicle.
Some of the symptoms of the BMW P0668 code include poor fuel economy, rough idling, stalling, and reduced engine power. In some cases, the vehicle may not start at all. These symptoms can be dangerous, especially if they occur while driving on the road. Therefore, it is crucial to address the issue as soon as possible to avoid any potential accidents or further damage to the vehicle.
The causes of the BMW P0668 code can vary, but some of the common ones include a faulty interior temperature sensor, damaged wiring, or a malfunctioning DME system. Fixing the issue may require replacing the faulty sensor or repairing the damaged wiring. In some cases, the entire DME system may need to be replaced.
In conclusion, the BMW P0668 code is a serious issue that needs to be addressed immediately. If you are experiencing any of the symptoms mentioned above, it is recommended to take your vehicle to a certified mechanic for diagnosis and repair.
Can You Still Drive with the BMW P0668 Code?
If your BMW is showing the P0668 code, it means that there is an internal fault with the interior temperature sensor signal in the DME (Digital Motor Electronics) system. This can cause a range of issues, including poor fuel economy, reduced engine performance, and even stalling or failure to start.
While it may be possible to continue driving your BMW with the P0668 code, it is not recommended. Ignoring the issue can lead to further damage to your vehicle and potentially costly repairs down the line. Additionally, driving with a faulty sensor can cause inaccurate readings and potentially compromise your safety on the road.
If you are experiencing symptoms such as reduced engine performance or stalling, it is especially important to address the issue as soon as possible. It is recommended to have your BMW diagnosed by a qualified mechanic to determine the root cause of the problem and to get it fixed promptly.
Overall, it is not advisable to continue driving with the P0668 code. It is best to have the issue addressed as soon as possible to ensure the safety and longevity of your BMW.
Conclusion
Diagnosing and fixing the BMW P0668 code can be a challenging task, but with the right information and tools, it is possible to get your BMW back on the road. The P0668 code is related to an internal fault in the DME interior temperature sensor signal, which can cause various symptoms such as engine misfires, reduced power, and poor fuel economy. The possible causes of the code include wiring issues, sensor failure, and software problems. To fix the issue, you may need to replace the faulty sensor, repair the wiring, or update the software. It is recommended to seek the help of a professional mechanic or use a diagnostic tool to accurately diagnose and fix the problem. By addressing the P0668 code promptly, you can ensure the safety and reliability of your BMW and avoid further damage to the engine and other components.
FAQ
What does the BMW P0668 code mean?
The BMW P0668 code is a diagnostic trouble code (DTC) that indicates an internal fault in the interior temperature sensor signal of the DME (Digital Motor Electronics) system.
What are the possible causes of the BMW P0668 code?
The possible causes of the BMW P0668 code include a faulty interior temperature sensor, damaged wiring or connectors in the interior temperature sensor circuit, a malfunctioning DME module, or a software issue.
What are the symptoms of the BMW P0668 code?
The symptoms of the BMW P0668 code may include the malfunction indicator lamp (MIL) or check engine light illuminating on the dashboard, poor engine performance, reduced fuel efficiency, and difficulty starting the engine.
How is the BMW P0668 code diagnosed?
The BMW P0668 code is diagnosed using an OBD-II scanner that retrieves the code from the vehicle’s onboard computer. The mechanic will then perform a visual inspection of the interior temperature sensor and its wiring and connectors. They may also perform a test of the DME module and its software.
Can I still drive my BMW with the P0668 code?
It is not recommended to drive your BMW with the P0668 code as it can cause further damage to the engine and reduce its performance. It is best to have the issue diagnosed and repaired as soon as possible.
What is the cost to fix the BMW P0668 code?
The cost to fix the BMW P0668 code will depend on the cause of the issue. The cost may range from $100 to $1000 or more, depending on the severity of the problem and the cost of parts and labor.
Can I fix the BMW P0668 code myself?
It is not recommended to attempt to fix the BMW P0668 code yourself unless you have experience with automotive repair and the necessary tools and equipment. It is best to have the issue diagnosed and repaired by a qualified mechanic.
Learn about other similar BMW Fault Codes from our BMW OBD 2 Fault Code List.