AutoCodes – GMC – P07BF GMC

P07BF GMC Code - Transmission Input Speed Sensor Circuit Low Voltage

Quick Answer

The Input Speed Sensor detects the primary pulley revolution speed and sends a signal to the Transmission. Common causes include Faulty Transmission Input Speed Sensor, Transmission Input Speed Sensor harness is open or shorted, Transmission Input 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 GMC indicates Transmission Input Speed Sensor Circuit Low Voltage.
Common causes: Common causes include Faulty Transmission Input Speed Sensor, Transmission Input Speed Sensor harness is open or shorted, Transmission Input 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 575

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 Jul 29, 2022

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

The Input Speed Sensor detects the primary pulley revolution speed and sends a signal to the Transmission. The Input Speed Sensor (ISS), also known as the transmission turbine speed sensor, is a hall-effect type sensor. The ISS mounts to the control valve upper body assembly and connects to the control solenoid (w/body and Transmission Control Module (TCM)) valve assembly through a wire harness and connector. The sensor faces the 1-2-3-4 and 3-5-R clutch housing machined teeth surface. The sensor receives 8.3-9.3 volts on the Input/Output Speed Sensor (ISS/OSS) supply voltage circuit from the Transmission Control Module (TCM). As the 1-2-3-4 and 3-5-R clutch housing rotates, the sensor produces a signal frequency based on the machined surface of the 1-2-3-4 and 3-5-R clutch housing. This signal is transmitted through the ISS signal circuit to the control solenoid (w/body and TCM) valve assembly. The control solenoid (w/body and TCM) valve assembly uses the ISS signal to determine line pressure, transmission shift patterns, Torque Converter Clutch (TCC) slip speed, and gear ratio. The Diagnostic Trouble Code (DTC) will be set when the TCM detects the ISS signal circuit voltage is less than 0.25 V for 0.8 s.

OBDII Code P07BF GMC - Transmission Input Speed Sensor Circuit Low Voltage - AutoCodes.com — P07BF GMC Code - Transmission Input Speed Sensor Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P07BF GMC?

Faulty Transmission Input Speed Sensor
Transmission Input Speed Sensor harness is open or shorted
Transmission Input Speed Sensor circuit poor electrical connection
Faulty Control Solenoid Valve Assembly

How to Fix the DTC P07BF GMC?

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 GMC 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.

Need more information about the P07BF GMC code?

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Need Help with the Code?

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Information for Specific GMC Models

P07BF 2014 GMC Sierra — Transmission Input Speed Sensor Circuit Low Voltage
P07BF 2015 GMC Sierra — Transmission Input Speed Sensor Circuit Low Voltage
P07BF 2016 GMC Sierra — Transmission Input Speed Sensor Circuit Low Voltage
P07BF 2017 GMC Sierra — Transmission Input Speed Sensor Circuit Low Voltage
P07BF 2018 GMC Sierra — Transmission Input Speed Sensor Circuit Low Voltage
P07BF 2019 GMC Sierra — Transmission Input Speed Sensor Circuit Low Voltage
P07BF 2020 GMC Sierra — Transmission Input Speed Sensor Circuit Low Voltage
P07BF 2021 GMC Sierra — Transmission Input Speed Sensor Circuit Low Voltage
P07BF 2022 GMC Sierra — Transmission Input Speed Sensor Circuit Low Voltage
P07BF 2023 GMC Sierra — Transmission Input Speed Sensor Circuit Low Voltage
P07BF 2024 GMC Sierra — Transmission Input Speed Sensor Circuit Low Voltage

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 GMC Code

1. What does the OBD-II code P07BF mean on a GMC vehicle?

The P07BF code indicates a low voltage issue in the transmission input speed sensor circuit, which monitors the rotational speed of the transmission input shaft.

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

Common symptoms include erratic shifting, delayed or harsh gear changes, transmission slipping, and the illumination of the check engine light.

3. What causes the P07BF code to appear?

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

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

Itâ€™s not recommended to drive with this code, as it may lead to transmission performance issues and potential long-term damage.

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

Inspect and repair any damaged wiring or connectors, replace the input speed sensor if faulty, and clear the code to see if it returns.

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

Repair costs vary but typically range from $100 to $300 for sensor replacement or wiring repairs, depending on labor rates and parts.

7. Can a bad battery cause the P07BF code?

A weak or failing battery can contribute to voltage-related issues, but itâ€™s not a common direct cause of this specific code.

8. How do I diagnose the P07BF code in my GMC?

Use an OBD-II scanner to confirm the code, inspect the input speed sensor and its wiring for damage, and test for proper voltage and continuity in the circuit.

9. Does the P07BF code affect fuel efficiency?

Yes, transmission issues caused by this code can lead to poor fuel efficiency due to improper gear ratios and increased engine load.

10. Is the P07BF code related to the output speed sensor?

No, the P07BF code specifically refers to the input speed sensor, though issues with the output speed sensor can sometimes cause similar transmission problems.