AutoCodes – Scion – P07BF Scion

P07BF Scion Code - Input / Turbine Speed Sensor 'A' Circuit Low

Quick Answer

The Input Speed sensor detects the rotation speed of the turbine which indicates the input speed of the transaxle. Common causes include Faulty Transmission Speed Sensor NT (Transmission Revolution Sensor), Transmission Speed Sensor harness is open or shorted, Transmission 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: P07BF Scion indicates Input / Turbine Speed Sensor 'A' Circuit Low.
Common causes: Common causes include Faulty Transmission Speed Sensor NT (Transmission Revolution Sensor), Transmission Speed Sensor harness is open or shorted, Transmission 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 444

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 Sep 11, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P07BF Scion Description

The Input Speed sensor detects the rotation speed of the turbine which indicates the input speed of the transaxle. By comparing the input turbine speed (speed sensor NT) signal with the counter gear speed (speed sensor NC) signal, the Engine Control Module (ECM) detects the shift timing of the gears and appropriately controls the engine torque and hydraulic pressure according to various conditions. As a result, the gears shift smoothly.
The NT terminal of the ECM detects a pulse signal from the speed sensor NT (input RPM). The ECM calculates gear shifts by comparing the signal from speed sensor NT with the signal from speed sensor NC.
While the transaxle is operating in 2nd, 3rd, 4th, 5th, or 6th gear with the shift lever in D, if the input shaft speed is less than 300 rpm although the output shaft speed is more than 1000 rpm, the ECM interprets this as a fault, illuminates the MIL and stores the Diagnostic Trouble Code (DTC).

OBDII Code P07BF Scion - Input / Turbine Speed Sensor 'A' Circuit Low - AutoCodes.com — P07BF Scion Code - Input / Turbine Speed Sensor 'A' Circuit Low

What does this mean?

What are the Possible Causes of the DTC P07BF Scion?

Faulty Transmission Speed Sensor NT (Transmission Revolution Sensor)
Transmission Speed Sensor harness is open or shorted
Transmission Speed Sensor circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P07BF Scion?

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 P07BF Scion 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 P07BF Scion Code

1. What does the OBDII code P07BF mean for a Scion?

P07BF indicates an issue with the Input/Turbine Speed Sensor 'A' Circuit, specifically that the sensor is reporting a voltage lower than the expected range.

2. What are the symptoms of the P07BF code in a Scion?

Common symptoms include erratic shifting, transmission slipping, reduced fuel efficiency, and possibly the illumination of the check engine light.

3. What causes the P07BF code to appear?

The most common causes include a faulty input/turbine speed sensor, damaged wiring or connectors, or an issue with the transmission control module (TCM).

4. Can I drive my Scion with the P07BF code?

Driving with this code is not recommended, as it could lead to further transmission damage or unsafe driving conditions due to erratic shifting.

5. How can I fix the P07BF code on my Scion?

Repairs may include replacing the input/turbine speed sensor, repairing or replacing damaged wiring, and, in rare cases, replacing the transmission control module.

6. How much does it cost to fix the P07BF code?

Costs can vary, but replacing the input/turbine speed sensor typically ranges between $100-$300, including parts and labor, depending on the vehicle model and location.

7. How do I diagnose the P07BF code in my Scion?

Diagnosis involves using an OBDII scanner to confirm the code, inspecting the sensor and wiring for damage, and testing the sensor's voltage output with a multimeter.

8. Can a dirty transmission fluid cause the P07BF code?

While dirty or low transmission fluid is not a primary cause, it can contribute to transmission issues that may trigger related codes or sensor malfunctions.

9. Will clearing the P07BF code fix the problem?

Clearing the code may temporarily turn off the check engine light, but the underlying issue must be resolved to prevent the code from returning.

10. Is the P07BF code specific to Scion vehicles?

No, the P07BF code is a generic OBDII code that can appear on various makes and models, but the troubleshooting and repair process may vary by vehicle.