P077D 2014 GMC Sierra Code - Transmission Output Speed Sensor Circuit High Voltage
Quick Answer
The P077D diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates a Transmission Output Speed Sensor Circuit High Voltage. Common causes include Faulty output speed sensor, Damaged wiring or connectors in the sensor circuit, Issues with the TCM. 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 2014 GMC Sierra indicates Transmission Output Speed Sensor Circuit High Voltage.
- Common causes
- Common causes include Faulty output speed sensor, Damaged wiring or connectors in the sensor circuit, Issues with the TCM.
- 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 P077D 2014 GMC Sierra Description
The P077D diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates a 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 provides crucial data to the vehicle's transmission control module (TCM) to ensure proper shifting and overall transmission performance.
Common Causes of P077D 2014 GMC Sierra
- Faulty output speed sensor
- Damaged wiring or connectors in the sensor circuit
- Issues with the TCM
- Electrical problems such as a short circuit or corrosion
- Mechanical issues within the transmission system
Symptoms of P077D 2014 GMC Sierra
- Erratic shifting behavior
- Harsh or delayed shifts
- Transmission slipping
- Transmission going into limp mode
- Check Engine Light illuminated
How to Fix P077D 2014 GMC Sierra
- Begin by conducting a thorough diagnosis using a scan tool to confirm the P077D code and pinpoint the exact cause of the issue.
- Inspect the output speed sensor, wiring, and connectors for any visible damage or corrosion. Replace any faulty components.
- Test the output speed sensor using a multimeter to ensure it is functioning correctly.
- Clear the DTC and perform a test drive to verify that the issue has been resolved and that the transmission is shifting properly.
- If the problem persists, further diagnostics may be required to identify any underlying issues with the TCM or transmission system.
Cost to Fix P077D 2014 GMC Sierra
The typical repair costs for addressing a Transmission Output Speed Sensor Circuit High Voltage issue can range from $150 to $400, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It is advisable to check local rates for a more precise estimate. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less.
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