P077C 2015 GMC Sierra Code - Transmission Output Speed Sensor Circuit Low Voltage
Quick Answer
The P077C diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates a problem with the transmission output speed sensor circuit registering low voltage. Common causes include Faulty output speed sensor, Damaged wiring or connectors in the sensor circuit, Corrosion in the sensor connections. 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
- P077C 2015 GMC Sierra indicates Transmission Output Speed Sensor Circuit Low Voltage.
- Common causes
- Common causes include Faulty output speed sensor, Damaged wiring or connectors in the sensor circuit, Corrosion in the sensor connections.
- 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 P077C 2015 GMC Sierra Description
The P077C diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates a problem with the transmission output speed sensor circuit registering low voltage. This sensor is responsible for monitoring the speed of the output shaft of the transmission. The information it provides is crucial for the proper functioning of the transmission system, as it helps the vehicle's computer control various aspects such as shift points, torque converter lockup, and overall performance.
Common Causes of P077C 2015 GMC Sierra
- Faulty output speed sensor
- Damaged wiring or connectors in the sensor circuit
- Corrosion in the sensor connections
- Issues with the vehicle's computer
- Low transmission fluid level or contaminated fluid
Symptoms of P077C 2015 GMC Sierra
- Erratic shifting behavior
- Harsh or delayed shifting
- Transmission slipping
- Transmission going into limp mode
- Illumination of the Check Engine Light
How to Fix P077C 2015 GMC Sierra
- Begin by conducting a thorough inspection of the output speed sensor and its wiring harness for any visible damage or corrosion.
- Test the output speed sensor using a multimeter to check for proper resistance and voltage output.
- Replace the output speed sensor if it is found to be faulty.
- Repair or replace any damaged wiring or connectors in the sensor circuit.
- Clear the DTC from the vehicle's computer using a scan tool and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P077C 2015 GMC Sierra
The typical repair costs for addressing a transmission output speed sensor circuit low voltage issue can range from $150 to $300, including parts and labor. However, it's important to note that 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's recommended to check with local shops for a more accurate estimate. Labor rates typically range between $80 and $150 per hour, with rates potentially higher at dealerships or in metropolitan areas, and lower at independent shops.
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