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Engine-Codes – GMC – P077D 2016 GMC Sierra

P077D 2016 GMC Sierra Code - Transmission Output Speed Sensor Circuit High Voltage

Quick Answer

The P077D diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a problem with the Transmission Output Speed Sensor Circuit High Voltage. Common causes include Faulty output speed sensor, Damaged or corroded wiring/connectors, Transmission control module malfunction. 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
P077D 2016 GMC Sierra indicates Transmission Output Speed Sensor Circuit High Voltage.
Common causes
Common causes include Faulty output speed sensor, Damaged or corroded wiring/connectors, Transmission control module malfunction.
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 15, 2024
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Code P077D 2016 GMC Sierra Description

The P077D diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a problem with the Transmission Output Speed Sensor Circuit High Voltage. This code is specifically related to the output speed sensor in the transmission, which is responsible for monitoring the speed of the output shaft. The output speed sensor plays a crucial role in the transmission's operation by providing data to the vehicle's control module to ensure proper shifting and overall performance.

OBDII Code P077D 2016 GMC Sierra - Transmission Output Speed Sensor Circuit High Voltage
P077D 2016 GMC Sierra Code - Transmission Output Speed Sensor Circuit High Voltage

Common Causes of P077D 2016 GMC Sierra

  1. Faulty output speed sensor
  2. Damaged or corroded wiring/connectors
  3. Transmission control module malfunction
  4. Low transmission fluid level or contaminated fluid
  5. Electrical issues such as a short circuit or open circuit in the sensor circuit

Symptoms of P077D 2016 GMC Sierra

  1. Erratic shifting or delayed gear changes
  2. Harsh or jerky transmission shifts
  3. Transmission slipping or difficulty engaging gears
  4. Illumination of the Check Engine Light
  5. Limp mode activation

How to Fix P077D 2016 GMC Sierra

  1. Begin by diagnosing the issue using a scan tool to confirm the P077D code and pinpoint the exact cause of the problem.
  2. Inspect the output speed sensor and its wiring for any visible damage, corrosion, or loose connections. Replace the sensor if necessary.
  3. Check the transmission control module for any signs of malfunction or damage. Repair or replace as needed.
  4. Verify the transmission fluid level and condition, topping up or flushing the fluid if required.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P077D 2016 GMC Sierra

The typical repair costs for addressing a P077D code on a 2016 GMC Sierra can range from $200 to $500, depending on the specific cause of the issue and the labor rates at the repair shop. This estimate includes the cost of a new output speed sensor, any necessary wiring repairs, and labor costs. It's important to note that prices can vary based on location, the complexity of the repair, and whether genuine OEM parts are used. It's recommended to consult with a trusted mechanic or repair shop for a more accurate cost estimate.

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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 P077D 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code P077D in a 2016 GMC Sierra?

The common symptoms of OBDII code P077D, indicating Transmission Output Speed Sensor Circuit High Voltage, in a 2016 GMC Sierra may include issues with shifting gears, transmission slippage, and the transmission going into limp mode.

2. What are the potential causes of OBDII code P077D in a 2016 GMC Sierra?

The potential causes of OBDII code P077D in a 2016 GMC Sierra may include a faulty output speed sensor, damaged wiring or connectors in the sensor circuit, or issues with the transmission control module.

3. How can I diagnose the Transmission Output Speed Sensor Circuit issue in my 2016 GMC Sierra?

To diagnose the Transmission Output Speed Sensor Circuit issue in your 2016 GMC Sierra, you can use a scan tool to read the OBDII code, inspect the wiring and connectors for any visible damage, and test the output speed sensor for proper functionality.

4. Can I continue driving my 2016 GMC Sierra with OBDII code P077D present?

It is not recommended to continue driving your 2016 GMC Sierra with OBDII code P077D present, as it can lead to further damage to the transmission and other components. It's best to address the issue promptly.

5. How can I repair OBDII code P077D in my 2016 GMC Sierra?

Repairing OBDII code P077D in your 2016 GMC Sierra may involve replacing the faulty output speed sensor, repairing or replacing damaged wiring or connectors, or reprogramming the transmission control module.

6. Is it possible to reset OBDII code P077D in a 2016 GMC Sierra without fixing the underlying issue?

While you can clear the OBDII code P077D in a 2016 GMC Sierra using a scan tool, the code will likely reappear if the underlying issue with the Transmission Output Speed Sensor Circuit is not addressed.

7. How much does it typically cost to fix OBDII code P077D in a 2016 GMC Sierra?

The cost to fix OBDII code P077D in a 2016 GMC Sierra can vary depending on the specific cause of the issue, but it may range from $200 to $500 for parts and labor.

8. Will OBDII code P077D cause any long-term damage to my 2016 GMC Sierra if left unrepaired?

Leaving OBDII code P077D unaddressed in your 2016 GMC Sierra can potentially cause long-term damage to the transmission and other related components, leading to more extensive and costly repairs down the line.

9. How can I prevent OBDII code P077D from occurring in my 2016 GMC Sierra in the future?

To prevent OBDII code P077D from occurring in your 2016 GMC Sierra in the future, it's essential to perform regular maintenance on the transmission, including checking and replacing sensors and addressing any issues promptly.

10. Is OBDII code P077D a common issue in 2016 GMC Sierra vehicles?

While OBDII code P077D may not be as common as some other codes, it can still occur in 2016 GMC Sierra vehicles due to various factors such as sensor failures, wiring issues, or transmission control module malfunctions.

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