AutoCodes – BMW – P0721 BMW

P0721 BMW Code - Output Speed Sensor Range/Performance

Quick Answer

The speed sensor detects the revolution of the idler gear parking pawl lock gear and emits a pulse signal. Common causes include Faulty Speed Sensor, Speed Sensor harness is open or shorted, Speed Sensor circuit poor electrical connection. 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: P0721 BMW indicates Output Speed Sensor Range/Performance.
Common causes: Common causes include Faulty Speed Sensor, Speed Sensor harness is open or shorted, Speed Sensor circuit poor electrical connection.
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 Popularity 16,716

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0721 BMW Description

The speed sensor detects the revolution of the idler gear parking pawl lock gear and emits a pulse signal. The pulse signal is sent to the Transmission Control Module (TCM) which converts it into vehicle speed.

OBDII Code P0721 BMW - Output Speed Sensor Range/Performance - AutoCodes.com — P0721 BMW Code - Output Speed Sensor Range/Performance

What does this mean?

What are the Possible Causes of the DTC P0721 BMW?

Faulty Speed Sensor
Speed Sensor harness is open or shorted
Speed Sensor circuit poor electrical connection

How to Fix the DTC P0721 BMW?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0721 BMW code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0721 BMW Code

1. What does the OBDII code P0721 mean on a BMW?

P0721 indicates an issue with the output speed sensor, specifically a range or performance problem that affects communication with the transmission control module.

2. What are the symptoms of a P0721 code on a BMW?

Common symptoms include erratic shifting, the transmission stuck in a single gear (limp mode), hesitation during acceleration, and the illumination of the check engine light.

3. What causes the P0721 code on a BMW?

Typical causes include a faulty output speed sensor, damaged wiring or connectors, a malfunctioning transmission control module (TCM), or internal transmission issues.

4. Can I drive my BMW with a P0721 code?

While the car may still be drivable, it is not recommended due to potential transmission damage, poor performance, and safety concerns related to erratic shifting.

5. How is the P0721 code diagnosed on a BMW?

A mechanic will use a scan tool to read the code, inspect the output speed sensor and its wiring, and check the transmission fluid level and condition.

6. How do you fix a P0721 code on a BMW?

Repairs may involve replacing the output speed sensor, repairing damaged wiring, cleaning electrical connectors, or addressing transmission fluid issues.

7. How much does it cost to fix a BMW with a P0721 code?

The cost typically ranges from $100 to $300 for replacing the output speed sensor, but it may be higher if additional transmission repairs are needed.

8. Can a bad output speed sensor damage the transmission?

Yes, a faulty sensor can cause improper shifting and stress on transmission components, potentially leading to further damage if not addressed.

9. How can I prevent a P0721 code from recurring on my BMW?

Regular maintenance, including checking the transmission fluid level and condition, inspecting wiring, and promptly addressing warning lights, can help prevent recurrence.

10. Is a P0721 code specific to BMW vehicles?

No, P0721 is a generic OBDII code that can appear on other vehicles, but the diagnostic and repair steps may vary slightly depending on the make and model.