P0720 BMW Code - Output Speed Sensor Circuit
Quick Answer
The P0720 diagnostic trouble code (DTC) specifically refers to the Output Speed Sensor Circuit on BMW vehicles. Common causes include Faulty output speed sensor, Damaged wiring or connectors in the output speed sensor circuit, Corrosion or contamination in the sensor or circuit. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0720 BMW indicates Output Speed Sensor Circuit.
- Common causes
- Common causes include Faulty output speed sensor, Damaged wiring or connectors in the output speed sensor circuit, Corrosion or contamination in the sensor or circuit.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code P0720 BMW Description
The P0720 diagnostic trouble code (DTC) specifically refers to the Output Speed Sensor Circuit on BMW vehicles. This code is indicating an issue with the transmission output speed sensor or its circuit. The output speed sensor is responsible for monitoring the speed of the transmission output shaft, which is crucial for the transmission to shift gears accurately and smoothly.
Common Causes of P0720 BMW
- Faulty output speed sensor
- Damaged wiring or connectors in the output speed sensor circuit
- Corrosion or contamination in the sensor or circuit
- Issues with the ECM/TCM receiving signals from the sensor
- Mechanical issues within the transmission causing sensor malfunctions
Symptoms of P0720 BMW
- Erratic or harsh shifting
- Transmission slipping
- Inaccurate speedometer readings
- Vehicle going into limp mode
- Illuminated Check Engine Light
How to Fix P0720 BMW
- Diagnose the issue by using a scan tool to read the code and check the output speed sensor and related circuitry.
- Inspect the wiring and connectors for any damage, corrosion, or loose connections. Repair or replace as necessary.
- Test the output speed sensor for proper operation and replace if faulty.
- Clear the DTC and test drive the vehicle to ensure the issue has been resolved.
- If the problem persists, further diagnosis of the transmission system may be required.
Cost to Fix P0720 BMW
The cost of repairing a P0720 code on a BMW can vary depending on the specific model and year of the vehicle, as well as the extent of the issue. On average, the parts for replacing an output speed sensor can range from $100 to $200, while the labor costs can be around $100 to $200. This brings the total repair cost to approximately $200 to $400. It's important to note that these are rough estimates, and actual costs may vary based on individual circumstances and the shop's rates. It's recommended to consult with a professional mechanic for a more accurate cost estimate.
When is the Code Detected?
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Frequently Asked Questions about P0720 BMW Code
1. What does the OBDII code P0720 mean on a BMW?
P0720 indicates a problem with the output speed sensor circuit, which monitors the rotational speed of the transmission's output shaft.
2. What are the symptoms of a P0720 code on a BMW?
Symptoms may include erratic or delayed shifting, harsh gear changes, the transmission stuck in one gear, or an illuminated check engine light.
3. What causes the P0720 code to appear on a BMW?
Common causes include a faulty output speed sensor, damaged wiring or connectors, a malfunctioning transmission control module (TCM), or low transmission fluid.
4. Can I drive my BMW with a P0720 code?
While it may be possible to drive, it is not recommended, as transmission performance issues could worsen and lead to further damage.
5. How do I fix a P0720 code on my BMW?
Start by inspecting the output speed sensor and its wiring for damage. Replace the sensor if faulty, repair any damaged wiring, and ensure the transmission fluid is at the correct level.
6. How much does it cost to repair the P0720 code on a BMW?
The cost can vary depending on the issue, ranging from $100 to $300 for a speed sensor replacement to higher amounts if wiring or the TCM needs repair.
7. How can I test the output speed sensor on my BMW?
You can test the sensor using a multimeter to check for proper resistance or signal output. Refer to your BMW's service manual for specific values.
8. Could low transmission fluid cause the P0720 code on a BMW?
Yes, low or dirty transmission fluid can affect the sensor's performance and trigger the P0720 code.
9. Will clearing the P0720 code fix the issue on my BMW?
Clearing the code will remove it temporarily, but the underlying issue must be addressed to prevent the code from returning.
10. Can a bad output speed sensor damage the transmission on a BMW?
If left unaddressed, a faulty sensor can lead to improper shifting and potential transmission damage over time.
Discuss the causes and fixes for P0720 BMW OBDII Code
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This is awesome. It gave me clear insight of what is going on in the car. I just thought the transmission was gone but maybe not.
Thank you AutoCodes -
I just replaced the secondary air pump. then I replaced the two front wheel speed sensors. Now today the trans failsafe prog came on. I pulled the code and it is P0720 output speed sensor. also previously the transmission slips after eighty mph. now the car does not accelerate. Do I need a new speed sensor?? The car is a 2002 BMW X5 4.41 with 118,000 miles .
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