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P07BF GMC Code - Transmission Input Speed Sensor Circuit Low Voltage

Quick Answer

The P07BF GMC diagnostic trouble code refers to a Transmission Input Speed Sensor Circuit Low Voltage. Common causes include Faulty input speed sensor, Damaged wiring or connections in the sensor circuit, Issues with the vehicle's onboard computer. 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 input speed sensor, Damaged wiring or connections in the sensor circuit, Issues with the vehicle's onboard computer.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P07BF GMC Description

The P07BF GMC diagnostic trouble code refers to a Transmission Input Speed Sensor Circuit Low Voltage. This code indicates that the input speed sensor in the transmission is sending a signal that is lower than the expected voltage range. The input speed sensor is responsible for monitoring the speed of the transmission input shaft and providing this information to the vehicle's onboard computer. This data is crucial for the transmission to shift gears smoothly and efficiently.

OBDII Code P07BF GMC - Transmission Input Speed Sensor Circuit Low Voltage
P07BF GMC Code - Transmission Input Speed Sensor Circuit Low Voltage

Common Causes of P07BF GMC

  1. Faulty input speed sensor
  2. Damaged wiring or connections in the sensor circuit
  3. Issues with the vehicle's onboard computer
  4. Low transmission fluid levels
  5. Electrical problems within the transmission system

Symptoms of P07BF GMC

  1. Erratic shifting patterns
  2. Delayed or harsh gear changes
  3. Transmission slippage
  4. Check Engine Light illuminated
  5. Decreased fuel efficiency

How to Fix P07BF GMC

  1. Diagnose the issue by using a scan tool to read the trouble code and perform further testing on the input speed sensor circuit.
  2. Inspect the input speed sensor for any signs of damage or wear, and replace it if necessary.
  3. Check the wiring and connections in the sensor circuit for any breaks, corrosion, or loose connections, and repair or replace as needed.
  4. Clear the trouble code from the vehicle's computer and test drive the vehicle to ensure the issue has been resolved.
  5. If the problem persists, further diagnostics may be required to pinpoint the exact cause of the low voltage signal.

Cost to Fix P07BF GMC

The typical repair costs for addressing a Transmission Input Speed Sensor Circuit Low Voltage issue can range from $150 to $400, including parts and labor. However, it's important to note that specific diagnosis time and labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and engine type. In general, auto repair shops may charge between $80 and $150 per hour for labor, with rates potentially higher in metropolitan areas or at dealerships, and lower at independent shops. To obtain a more accurate estimate, it is recommended to check with local repair shops.

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Information for Specific GMC Models

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?

It’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 it’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.

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