BMW P0720 Code:Output Speed Sensor Circuit
As a car owner, it’s important to be aware of any warning signs or diagnostic trouble codes that may appear on your vehicle’s dashboard. One such code that BMW drivers may encounter is the P0720 code, which is related to the transmission control module (TCM). If you’re experiencing this issue, it’s important to understand the meaning, causes, symptoms, and potential fixes for the P0720 code. In this article, we’ll provide expert advice on how to diagnose and resolve this transmission issue, so you can get back on the road with confidence.
What Does the BMW P0720 Code Mean?
The BMW P0720 code is a diagnostic trouble code (DTC) that indicates a problem with the output speed sensor circuit in the transmission control module (TCM). The output speed sensor is responsible for monitoring the speed of the output shaft of the transmission and sending that information to the TCM. When the TCM detects a problem with the output speed sensor circuit, it will trigger the P0720 code and illuminate the check engine light. This code can cause a variety of symptoms, including harsh shifting, transmission slipping, and decreased fuel efficiency. It is important to address this issue promptly to prevent further damage to the transmission.
Signs and Symptoms of BMW P0720 Code
The P0720 code in BMW vehicles is related to the output speed sensor circuit, which is responsible for monitoring the speed of the output shaft of the transmission. When this sensor circuit fails, it can cause a range of symptoms that can affect the performance and safety of the vehicle. Here are some of the most common signs and symptoms of the BMW P0720 code:
- Check Engine Light: The most obvious symptom of the P0720 code is the illumination of the check engine light on the dashboard. This light can indicate a range of issues, but when it is accompanied by other symptoms, it is likely related to the output speed sensor circuit.
- Transmission Issues: The output speed sensor circuit is an important component of the transmission system, and when it fails, it can cause a range of transmission issues. These may include slipping, hesitation, rough shifting, or even complete transmission failure.
- Speedometer Issues: The output speed sensor circuit is also responsible for providing data to the speedometer, so when it fails, the speedometer may not work properly. This can make it difficult to accurately gauge the speed of the vehicle, which can be dangerous.
- Stalling: In some cases, the P0720 code can cause the engine to stall or even prevent it from starting altogether. This is because the output speed sensor circuit is also responsible for providing data to the engine control module, which uses it to adjust the fuel and ignition timing.
- Reduced Fuel Efficiency: When the output speed sensor circuit fails, it can cause the engine to run less efficiently, which can result in reduced fuel economy. This can be especially noticeable over time, as the vehicle may require more frequent refueling.
If you are experiencing any of these symptoms, it is important to have your BMW inspected by a qualified mechanic as soon as possible. Ignoring the P0720 code can lead to further damage to the transmission or engine, which can be costly to repair. A mechanic can diagnose the issue and recommend the best course of action to get your BMW back on the road safely.Possible Causes of BMW P0720 Code
The P0720 code in BMW vehicles is related to the output speed sensor circuit in the transmission control module (TCM). This code indicates that there is a problem with the signal from the output speed sensor, which measures the rotational speed of the output shaft of the transmission. Here are some of the possible causes of the P0720 code:
1. Faulty Output Speed Sensor: The most common cause of the P0720 code is a faulty output speed sensor. This sensor can fail due to wear and tear, damage, or electrical issues.
2. Wiring Issues: Another possible cause of the P0720 code is wiring issues in the output speed sensor circuit. This can include damaged or corroded wires, loose connections, or short circuits.
3. Failed TCM: In some cases, the P0720 code can be caused by a failed TCM. This can happen due to electrical issues, software glitches, or physical damage.
4. Malfunctioning Engine Control Module (ECM): The ECM and TCM work together to control the transmission. If the ECM is malfunctioning, it can cause the P0720 code to appear.
5. Low Transmission Fluid: Low transmission fluid levels can also cause the P0720 code to appear. This can happen due to leaks, improper maintenance, or other issues.
6. Failed Transmission: In rare cases, the P0720 code can be caused by a failed transmission. This can happen due to wear and tear, damage, or other issues.
It is important to note that the P0720 code can have multiple causes, and a proper diagnosis is necessary to determine the exact issue. However, the most common causes are a faulty output speed sensor and wiring issues in the output speed sensor circuit. If you are experiencing the P0720 code in your BMW, it is recommended to have it diagnosed and repaired by a qualified mechanic.
Fixes for BMW P0720 Code
The P0720 code in BMW vehicles is related to the output speed sensor circuit, which is responsible for monitoring the speed of the output shaft of the transmission. When this sensor fails or malfunctions, it can cause a range of transmission issues, including shifting problems, stalling, and reduced performance. Here are some of the possible fixes for the BMW P0720 code:
- Replace the output speed sensor: The most common fix for the P0720 code is to replace the output speed sensor. This involves removing the old sensor and installing a new one, which can be done by a qualified mechanic or DIY enthusiast with the right tools and knowledge.
- Check the wiring and connections: Sometimes, the issue may be related to a faulty wiring or connection in the output speed sensor circuit. In this case, the wiring and connections should be inspected and repaired or replaced as needed.
- Replace the transmission control module: In rare cases, the P0720 code may be caused by a malfunctioning transmission control module (TCM). If this is the case, the TCM should be replaced by a qualified mechanic.
- Perform a transmission flush: In some cases, the P0720 code may be caused by dirty or contaminated transmission fluid. Performing a transmission flush can help remove any debris or contaminants and improve the performance of the transmission.
- Check for other transmission issues: It’s possible that the P0720 code may be related to other transmission issues, such as a faulty torque converter or a damaged transmission. In these cases, a qualified mechanic should perform a thorough inspection and diagnosis to determine the root cause of the problem.
If you’re experiencing the symptoms of the P0720 code in your BMW, it’s important to address the issue as soon as possible to avoid further damage to your transmission. By following these fixes, you can resolve the issue and get your BMW back to its optimal performance.
How Much Will It Take to Fix the BMW P0720 Code?
The cost to fix the BMW P0720 code can vary depending on the root cause of the issue. In some cases, it may be a simple fix that can be done at home, while in other cases, it may require professional assistance and expensive repairs.
If the issue is related to a faulty output speed sensor, the cost to replace the sensor can range from $100 to $300, including labor costs. However, if the issue is related to a damaged wiring harness or a malfunctioning transmission control module, the cost can be significantly higher, ranging from $500 to $1500 or more.
It’s important to note that ignoring the P0720 code can lead to further damage to the transmission, which can result in even higher repair costs. Therefore, it’s recommended to address the issue as soon as possible to avoid any additional damage and expenses.
If you’re unsure about the root cause of the P0720 code or how to fix it, it’s best to consult with a professional mechanic who can diagnose the issue and provide an accurate estimate for the repair costs.
Possible Causes and Fixes of Code P0720 in BMW
| Possible Cause | Fix | Cost to Fix |
|---|---|---|
| Failed Output Speed Sensor | Replace Output Speed Sensor | $100-$300 |
| Wiring Issues | Repair or Replace Wiring | $100-$500 |
| Failed TCM | Replace TCM | $500-$1000 |
| Failed ECM | Replace ECM | $500-$1500 |
| Low Transmission Fluid | Check and Refill Transmission Fluid | $50-$100 |
Preventing the BMW P0720 Code
The BMW P0720 code is a transmission-related issue that can cause serious problems if left unaddressed. Fortunately, there are several preventive measures you can take to avoid this code from appearing in your BMW. Here are some of the most effective ways to prevent the P0720 code:
- Regular Maintenance: One of the most important preventive measures is to keep up with your BMW’s regular maintenance schedule. This includes changing the transmission fluid and filter at the recommended intervals. Regular maintenance can help prevent wear and tear on the transmission and keep it running smoothly.
- Check Engine Light: If your BMW’s check engine light comes on, don’t ignore it. This could be an early warning sign of a transmission issue, including the P0720 code. Have your vehicle checked by a qualified mechanic as soon as possible to prevent further damage.
- Driving Habits: Your driving habits can also affect the health of your BMW’s transmission. Avoid aggressive driving, such as sudden acceleration or hard braking, as this can put extra strain on the transmission. Also, avoid towing heavy loads or carrying excessive weight in your vehicle, as this can also cause transmission problems.
- Quality Parts: When replacing parts in your BMW’s transmission, always use high-quality, OEM parts. Cheap or inferior parts can cause premature wear and tear on the transmission, leading to the P0720 code and other issues.
- Transmission Cooler: Installing a transmission cooler can also help prevent the P0720 code. This device helps keep the transmission fluid cool, which can reduce wear and tear on the transmission and prevent overheating.
By following these preventive measures, you can help keep your BMW’s transmission running smoothly and avoid the P0720 code. Remember, regular maintenance and attention to warning signs are key to preventing transmission issues. If you do experience the P0720 code or other transmission problems, be sure to have your vehicle checked by a qualified mechanic as soon as possible.
How Serious is the BMW P0720 Code?
The BMW P0720 code is a serious issue that should not be ignored. This code indicates a problem with the output speed sensor circuit in the transmission control module (TCM). The output speed sensor is responsible for monitoring the speed of the output shaft of the transmission. If the TCM detects a problem with the output speed sensor circuit, it will trigger the P0720 code.
Ignoring the P0720 code can lead to serious transmission problems, such as shifting issues, slipping gears, and even complete transmission failure. These issues can be dangerous and costly to repair. It is important to address the P0720 code as soon as possible to prevent further damage to the transmission and ensure the safety of the vehicle.
If you are experiencing symptoms of the P0720 code, such as a check engine light, transmission warning light, or shifting issues, it is recommended to have your vehicle inspected by a qualified mechanic. They can diagnose the issue and provide the necessary repairs to fix the problem and prevent further damage to your BMW’s transmission.
Can You Still Drive with the BMW P0720 Code?
If you have received the BMW P0720 code, it is important to address the issue as soon as possible. This code indicates a problem with the output speed sensor circuit in your vehicle’s transmission control module. The output speed sensor is responsible for monitoring the speed of the output shaft of the transmission, which is used to determine the vehicle’s speed and shift points.
While it may be possible to continue driving your BMW with the P0720 code, it is not recommended. Ignoring this issue can lead to further damage to your transmission and potentially leave you stranded on the side of the road. Additionally, driving with a malfunctioning transmission can be dangerous and put you and other drivers at risk.
If you have received the P0720 code, it is best to have your vehicle inspected by a qualified mechanic as soon as possible. They can diagnose the issue and provide you with the necessary repairs to get your BMW back on the road safely.
Conclusion
If you are experiencing the BMW P0720 code, it is important to address the issue as soon as possible to avoid further damage to your vehicle’s transmission. The code indicates a problem with the output speed sensor circuit, which can cause issues with shifting and overall performance. Possible causes include a faulty sensor, wiring issues, or a malfunctioning TCM. It is recommended to have a professional mechanic diagnose and repair the issue to ensure proper and safe functioning of your BMW. Don’t hesitate to seek expert advice and get your vehicle back on the road.
FAQ
What does the BMW P0720 code mean?
The BMW P0720 code refers to a fault in the output speed sensor circuit of the transmission control module (TCM). This code indicates that the TCM is not receiving a signal from the output speed sensor, which can cause issues with shifting and overall transmission performance.
What are the common causes of the BMW P0720 code?
The most common causes of the BMW P0720 code include a faulty output speed sensor, damaged wiring or connectors in the output speed sensor circuit, or a malfunctioning TCM. Other potential causes may include low transmission fluid levels, a clogged transmission filter, or a damaged transmission.
What are the symptoms of the BMW P0720 code?
The symptoms of the BMW P0720 code may include erratic shifting, delayed or harsh shifting, a loss of power or acceleration, and an illuminated check engine light. In some cases, the vehicle may also go into limp mode, which limits the speed and performance of the vehicle.
Can I continue driving my BMW with the P0720 code?
It is not recommended to continue driving your BMW with the P0720 code. This code indicates a fault in the transmission control module, which can cause issues with shifting and overall transmission performance. Continuing to drive the vehicle can cause further damage to the transmission and may result in costly repairs.
How is the BMW P0720 code diagnosed?
The BMW P0720 code is diagnosed using a diagnostic scanner that can read the fault codes stored in the vehicle’s computer. A mechanic will also perform a visual inspection of the output speed sensor and its wiring and connectors to check for any damage or wear. They may also perform a transmission fluid and filter change to rule out any other potential causes.
What are the potential fixes for the BMW P0720 code?
The potential fixes for the BMW P0720 code include replacing the output speed sensor, repairing or replacing damaged wiring or connectors in the output speed sensor circuit, or replacing the TCM. Other potential fixes may include performing a transmission fluid and filter change, or repairing any other damaged components in the transmission.
Learn about other similar BMW Fault Codes from our BMW OBD 2 Fault Code List.