P077D 2017 GMC Sierra Code - Transmission Output Speed Sensor Circuit High Voltage
Quick Answer
The P077D diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates a problem with the Transmission Output Speed Sensor Circuit High Voltage. Common causes include Faulty transmission output speed sensor, Wiring or connector issues in the speed sensor circuit, Corrosion or damage to the sensor or its wiring. 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 2017 GMC Sierra indicates Transmission Output Speed Sensor Circuit High Voltage.
- Common causes
- Common causes include Faulty transmission output speed sensor, Wiring or connector issues in the speed sensor circuit, Corrosion or damage to the sensor or its wiring.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P077D 2017 GMC Sierra Description
The P077D diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates a problem with the Transmission Output Speed Sensor Circuit High Voltage. The transmission output speed sensor is responsible for monitoring the speed of the output shaft of the transmission. This information is crucial for the transmission control module (TCM) to determine shift points, torque converter lockup, and overall transmission performance. When the sensor detects a high voltage signal that is outside of the normal operating range, the P077D code is triggered.
Common Causes of P077D 2017 GMC Sierra
- Faulty transmission output speed sensor
- Wiring or connector issues in the speed sensor circuit
- Corrosion or damage to the sensor or its wiring
- TCM software or programming issues
- Electrical system malfunctions
Symptoms of P077D 2017 GMC Sierra
- Erratic shifting behavior
- Harsh engagement when shifting gears
- Delayed or prolonged shifting
- Transmission slipping
- Limp mode activation
How to Fix P077D 2017 GMC Sierra
- Begin by diagnosing the P077D code using a scan tool to verify the issue and pinpoint the exact cause.
- Inspect the transmission output speed sensor and its wiring for any visible damage, corrosion, or loose connections.
- Test the sensor's resistance and output voltage to determine if it is functioning within specifications.
- If the sensor is faulty, replace it with a new, OEM-quality part and ensure proper installation.
- Clear the DTC and perform a test drive to confirm that the issue has been resolved and that the transmission is operating correctly.
Cost to Fix P077D 2017 GMC Sierra
The typical repair costs for addressing a P077D code can vary depending on the specific cause of the issue. In general, replacing a transmission output speed sensor and addressing related wiring or connector problems can range from $150 to $400 in parts and labor. However, it's important to note that diagnosis time and labor rates at auto repair shops can vary significantly. Rates may be higher at dealerships or in metropolitan areas, while independent shops often offer more competitive pricing. It's advisable to obtain quotes from multiple sources to get a more accurate estimate for your specific situation.
Need more information about the P077D 2017 GMC Sierra code?
Need more information on how to fix the P077D 2017 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P077D 2017 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P077D 2017 GMC Sierra Code
No Frequently Asked Questions about P077D 2017 GMC Sierra Code found.
Discuss the causes and fixes for P077D 2017 GMC Sierra OBDII Code
Code P077D 2017 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.